手機版
Milk is as pure white as fresh fallen snow and as familiar as a mother's warm touch. Common sense once led me to believe that if a single food, milk, could sustain a baby as the sole source of nutrients, then it must be “nature's most perfect food.” Milk builds strong bones – I have learned over and over again – and since the hardest parts of my body are made mostly of calcium, this liquid food must be essential for my strength and stability. Milk is for life, because they tell me I never outgrow my need for milk. All these “facts” were the “truth” until I took the trouble to think a little about the subject on my own and to look into the scientific research. May I share with you some of my surprising discoveries?
Mother's Milk Can Be a Perfect Food
Within the same species – like cow for calf, cat for kitten, mare for foal – mother's milk can be the perfect food for the very young – not, after weaning, for older offspring, and certainly, not for the fully-grown. All mammals nourish their developing young with this ready-to-eat liquid synthesized by specialized sweat glands, called the mammary glands. This life-giving fluid contains the nutrients, antibodies and hormones that optimize the chances for growth and survival of the infant.
How essential is mother's milk? Human infants deprived of the advantages of human breast milk have:1
1、Two to four times the risk of sudden infant death syndrome (crib death),
2. More than 60 times the risk of pneumonia in the first three months of life,2
3. Ten times the risk of hospitalization during their first year
4.Reduced intelligence as measured by IQ score
5. Behavioral and speech difficulties
6.An increased chance of suffering from infections, asthma, eczema, type I diabetes, and cancer (lymphoma and leukemia) in early life
7.A greater risk of heart disease, obesity, diabetes, multiple sclerosis, food allergies, ulcerative colitis, and Crohn’s disease later in life
1、Two to four times the risk of sudden infant death syndrome (crib death),
2. More than 60 times the risk of pneumonia in the first three months of life,2
3. Ten times the risk of hospitalization during their first year
4.Reduced intelligence as measured by IQ score
5. Behavioral and speech difficulties
6.An increased chance of suffering from infections, asthma, eczema, type I diabetes, and cancer (lymphoma and leukemia) in early life
7.A greater risk of heart disease, obesity, diabetes, multiple sclerosis, food allergies, ulcerative colitis, and Crohn’s disease later in life
No one argues against the fact that human breast milk is nature’s most perfect food for human babies. There is also no satisfactory substitute; therefore, every effort should be made to have every infant breast-fed exclusively for six months; and then, with the addition of healthy solid food choices, partially breast-fed until the age of two. (More information on this is found in The McDougall Program for Women book).
Mother's Milk is Species Specific
The nutritional needs of very young animals are met by the unique qualities of the milk of that particular species. The composition of this infant food has evolved over millions of years to be ideally suited for that animal. Let me explain in terms of one essential nutrient: protein.
The amount of protein in the milk of an animal varies to meet the growth demands of the very young – the faster an animal grows the greater the protein needs.
Comparisons of Milk of Different Species3
|
Animal
|
Protein*
|
Growth Rate(days)**
|
|
Human
|
1.2
|
180
|
|
Horse
|
2.4
|
60
|
|
Cow
|
3.3
|
47
|
|
Goat
|
4.1
|
19
|
|
Dog
|
7.1
|
8
|
|
Cat
|
9.5
|
7
|
|
Rat
|
11.8
|
4.5
|
* Grams per 100 milliliters (in terms of % of calories, cow's milk has four times more protein than human milk; 21% vs. 5%4)
** Time required to double birth weight
In addition to the much higher protein content, consider the other nutrient differences between cow's milk and human:
|
Nutrient
|
Human
mg/100 Cal |
Cow
mg/100 Cal |
|
Calcium
|
45
|
194
|
|
Phosphorus
|
18
|
152
|
|
Sodium
|
23
|
80
|
|
Potassium
|
72
|
246
|
Not surprisingly, since a calf doubles its birth weight nearly four times faster than a human infant does, the concentrations of protein and calcium are nearly four times greater. Rapid growth requires a much higher density of all kinds of nutrients.
Problems of Excess Nutrients
Most people think of health problems in terms of deficiencies of nutrients; this is the reason vitamin and mineral supplements are so popular. However, I do not see diseases of deficiency in my patients. For example, I see no vitamin C deficiency (scurvy), B1 deficiency (Beriberi), or protein deficiency in my patients. Rather, I see diseases of excess – such as excess dietary fat (obesity), cholesterol (heart disease), and salt (hypertension). Therefore, feeding an overly-concentrated food such as cow's milk to people (infants, children, and adults) promotes diseases of excess. (Some of you are still thinking cow's milk corrects calcium deficiency in people, preventing osteoporosis. Be patient, in a moment I will show you this is not true.)
Replacing human breast milk with cow's milk was once tried in the mid-1800s in the United States for emergency situations (such as when a mother died in childbirth). The result was a quick death for most of the infants, because the high protein content of the cow's milk forced fluid losses from the infant's kidneys, resulting in dehydration.5 Once this problem was recognized, then infant formulas were developed which added sugar to the cow's milk in order to reduce the protein concentration of the cow's milk and make it more resemble human milk. Some of you may be old enough to remember making or drinking infant formula made from Carnation evaporated cow's milk and Karo syrup (sugar).6 (This is a very unhealthy formula for infants – do not use this).
Replacing human breast milk with cow's milk was once tried in the mid-1800s in the United States for emergency situations (such as when a mother died in childbirth). The result was a quick death for most of the infants, because the high protein content of the cow's milk forced fluid losses from the infant's kidneys, resulting in dehydration.5 Once this problem was recognized, then infant formulas were developed which added sugar to the cow's milk in order to reduce the protein concentration of the cow's milk and make it more resemble human milk. Some of you may be old enough to remember making or drinking infant formula made from Carnation evaporated cow's milk and Karo syrup (sugar).6 (This is a very unhealthy formula for infants – do not use this).
Consider the purpose of cow's milk. This is an ideal food to grow a calf from its 60-pound birthweight to a 600-pound young cow, ready to wean. This is a high “octane” fuel. One obvious consequence of people eating “calf food” is rapid fat gain – and dairy products are one of the leading contributors to the epidemic of excess body fat affecting 25% of children and 65% of adults in Western populations. Matters are made even worse when cow's milk is converted into even more concentrated products, like cheeses.
Cow's milk products have some important nutritional deficiencies.4 They are completely devoid of fiber; and contain insufficient amounts of vitamins, like C and niacin, and minerals, like iron, to meet the human body's needs.
False Promise #1: Milk Builds Strong Bones
If you ask people why they drink milk, they'll tell you it's for the calcium. Milk has lots of calcium and its supporters have "milked" that point for all it's worth. One of your first clues that cow's milk is not ideal for bone health comes from comparison of the calcium content of the two kinds of milk (shown above). Cow's milk has more than four times the calcium content as human breast milk. If this exaggerated amount of calcium is not required during our greatest time of growth – babies double in weight in six months – then why should a concentration of calcium ideal for calves be required when we stop growing bones as adults? Without a doubt growing the hefty skeleton of a cow takes much more calcium than growing relatively small human bones.
Billions of people worldwide do not consume milk after weaning and they grow normal adult skeletons.7 For example, Bantu women in Africa consume no dairy products at all, and take in only about 250 to 400 mg of calcium each day through vegetable sources8 (about half the recommended daily intake in the U.S.). These women typically have ten children each and breast-feed each one for about 10 months. Yet despite a diet with no dairy products and the tremendous calcium drain of pregnancy and breast-feeding, osteoporosis is virtually unknown among these women.8 When rural African women migrate to cities or move to Western counties and adopt rich, high-calcium diets, osteoporosis becomes common.9 You will soon understand this is because their new diet becomes very high in animal protein.10
Billions of people worldwide do not consume milk after weaning and they grow normal adult skeletons.7 For example, Bantu women in Africa consume no dairy products at all, and take in only about 250 to 400 mg of calcium each day through vegetable sources8 (about half the recommended daily intake in the U.S.). These women typically have ten children each and breast-feed each one for about 10 months. Yet despite a diet with no dairy products and the tremendous calcium drain of pregnancy and breast-feeding, osteoporosis is virtually unknown among these women.8 When rural African women migrate to cities or move to Western counties and adopt rich, high-calcium diets, osteoporosis becomes common.9 You will soon understand this is because their new diet becomes very high in animal protein.10
The world picture fails to support benefits claimed by the dairy industry. Countries that have the highest traditional consumption of dairy products (United States, Sweden, Israel, Finland, and the United Kingdom) also have the highest rates of osteoporosis-related hip fractures.11 Places in the world with a traditionally low intake of dairy - Hong Kong, Singapore, countries in rural Africa - have the lowest incidence of osteoporosis.
If calcium is the key and milk is such a great source, why are there still 10 million Americans with osteoporosis? Long-standing recommendations to increase calcium intakes have had little or no effect on the prevalence of osteoporosis or fractures in the United States.7
Worldwide, the incidence of osteoporosis correlates directly and strongly with animal protein intake. The highly acidic nature of animal protein is the major cause of bone loss.10 (You can read more about this at www.drmcdougall.com in the February 2003 McDougall Newsletter in the article, “Fish is not health food.”)
False Promise #2: Research Supports Dairy’s Benefits
In September of 2000, two researchers compiled a review of the 57 studies on dairy products and bone health which had been published in the scientific literature since 1985. This review was published in the American Journal of Clinical Nutrition.12 Not surprisingly, most of this research was financed by the dairy industry. The researchers reported that 53 percent of the studies showed no benefit from dairy. Then they excluded studies with weak evidence or poor techniques, which eliminated more than half of the studies. Of the 21 remaining studies, 57 percent again showed no benefit from dairy, and another 14 percent found that dairy products actually weaken bones. Think about that – this means that 71 percent of the scientifically sound research did not support the bone building benefits of dairy products and some showed actual harm.
Randomized controlled studies compare an experimental group with a control group and are considered the most valid form of scientific research. Of the seven randomized controlled studies which have been completed on the effects of dairy products on bone health, six were financed by the dairy industry. Only one looked at the benefits of fluid milk on the health of the women most likely to benefit: postmenopausal women.13 At the conclusion of this study, the women in the experimental group, fed three eight-ounce glasses of skim milk daily for a year, were still losing more calcium from their bodies than they were absorbing (they were in negative calcium balance). Even though they consumed more than 1400 mg of calcium daily they still lost twice as much bone as the women in the control group, who were not getting the supplemental milk. Yet the industry continues to proclaim its pro-milk message from every rooftop.
False Promise #3: Dairy Foods Make Meeting Calcium Recommendations Easy
Recommended intakes of calcium to prevent osteoporosis are now so high that it is difficult, if not impossible, to make up practical diets that meet these recommendations.7 The National Institutes of Health Consensus Conference and The National Osteoporosis Foundation support a calcium intake of 1,500 milligrams per day for postmenopausal women not taking estrogen, and for adults 65 years or older. Assuming 300-400 mg of calcium comes from starches, vegetables, fruits, eggs, poultry, fish, and meats,4 then 1,200 mg would have to be obtained from dairy products daily. An average postmenopausal sedentary woman consumes 1500 calories a day. The amount of dairy required to meet her recommended calcium needs would be:4
* 6 ounces Cheddar cheese (which is 74% fat). This would mean that 46% of the calories in her diet must be from cheese; or
* One quart (32 ounces) of whole milk (which is 50% fat) which would mean 40% of her diet is from milk; or
* One quart (32 ounces) of whole milk (which is 50% fat) which would mean 40% of her diet is from milk; or
* One quart (32 ounces) of non-fat milk (which is 3% fat) which would mean 23% of her diet would be non-fat milk.
The dairy industry is happy about these grand recommendations, but consuming that much cow's milk product daily would replace too many other more filling (satisfying) and nutritious foods, and be unhealthy.
False Promise #4: We Require 1500 mg of Calcium a Day
Our requirements for calcium are far less than recommended. Scientific research demonstrates people need as little as 150 to 200 mg/day, even when pregnant or lactating.14
Consider the great variation in calcium intakes and recommendation:
|
Minimum Requirement Based on Research
|
150-200 mg
|
|
Calcium Intake for Underdeveloped Countries
|
300-500 mg
|
|
Calcium Intake for Average American
|
500-600 mg
|
|
World Health Organization Recommendation
|
400-500 mg
|
|
USA Food and Nutrition Board
|
1000- 1300 mg
|
|
A National Institutes of Health
|
1000-1500 mg
|
Why the large variation in figures for calcium intakes and recommendations? The simple answer is the amount of calcium in the foods you eat has little effect on the quantity of calcium that is eventually taken into the body and on the health of your bones.15
Your intestine will always absorb sufficient calcium to meet your needs from the foods you eat. On a diet low in calcium, the efficiency of mineral absorption is increased, and the intestine takes in more calcium. On a high-calcium diet, more calcium is left in the intestine to be excreted, unused, in the feces.16 The intestine is so “smart” about calcium that it never fails to meet the body’s needs. If you look over the last hundred years of scientific and nutritional literature you will find there is no evidence that dietary calcium deficiency occurs in humans, even though most people in the world don't drink milk after weaning – because of custom, lactose intolerance, or simply because milk is not generally available in their part of the world. 7,14, 17-20 This means there is no such disease as “dietary calcium deficiency” – think again if your mind drifts to osteoporosis – remember, populations with the lowest calcium intakes have the strongest bones; the least osteoporosis, worldwide.11
False Promise #5: Milk is the Best Food for Bones
The truth is, milk is not the only source of calcium and it is not the best source of calcium. Consider that the original source of calcium is the ground. Calcium, and other minerals, are dissolved in watery solutions and absorbed by the roots of plants. These minerals are then incorporated in the roots, stems, leaves, flowers, and fruits of the plants. Humans can get plenty of calcium the same way it gets into cow's milk; from the plant foods they eat.
Inappropriate concern about calcium intake may divert attention and resources from more important nutritional issues. Calcium isn't the only nutrient that affects bone health. Studies have shown that potassium and magnesium may be even more critical in preventing bone loss, and that beta-carotene, phosphorus, and fiber play important roles as well.21,22 Plants are excellent sources of these nutrients. Milk provides no beta-carotene and no dietary fiber.4 Most important, bone health can be more about what you don't eat than what you do eat. Certain foods and substances – like animal proteins, cigarettes, soft drinks, caffeine, and salt – all affect your body's ability to absorb and use calcium vs. the loss of calcium from the body. 23,24
False Promise #6: Milk is Necessary for vitamin D
Some people will point out milk's vitamin D content as evidence of its critical place in a healthy diet. Well, that's a fabrication, too. Vitamin D is not really a vitamin; it's a hormone that the body produces in reaction to sunlight. And it isn't present naturally in milk – it's added as a supplement at the dairy processing factory. This addition was supposedly done to prevent rickets, a painful, deforming bone condition that is caused by vitamin D deficiency. But rickets is really caused by limited exposure to sunlight, and the body levels of vitamin D are only slightly affected by dietary sources.25,26 The amount of sunlight we get during the summer holidays is reflected in our vitamin D levels all year long. More than 90% of the vitamin D in the body is produced by sunlight. Exposing the face and arms for as little as 15 minutes 3 times a week provides adequate amounts of vitamin D. However, this activity is modified by the use of sunscreens and by skin pigmentation.27 So nearly everyone gets enough vitamin D every day just through normal activities – we don't need to drink milk to get it. Plus, vitamin D is fat-soluble, which means it is stored in our body fat for long periods of time – and most importantly, for periods of low sun exposure in the winter months.
Myth #7: Milk Cures Hypertension
A grant from the National Dairy Council supported a large review of the influence of dietary (dairy products) and nondietary (supplements) calcium supplementation on blood pressure and came to the conclusion “that calcium supplementation leads to a small reduction in systolic (top number) and diastolic (bottom number) blood pressure.”28 Of the 67 studies published, 47 proved eligible for review. The actual decrease in blood pressure was paltry: Decreases of 1.44 mmHg systolic and 0.84 mmHg diastolic. The mechanism causing this almost undetectable reduction in blood pressure from consuming calcium is unknown.
By comparison, our results from the McDougall residential center show a 23/14 mmHg decrease in blood pressure in people with high blood pressure (150/90 mmHg or greater) in less than 10 days; and almost all of these people were taken off all of their blood pressure medication during the 10 days.
False Promise #8: Milk Prevents Colon Cancer
Colon cancer is one of the most common cancers in the United States and other places where people eat the Western diet. There is general agreement in the scientific community that this form of cancer is due to the high-meat, high-fat, low-dietary fiber, low-vegetable diet that people eat.29,30 However, among those unfortunate people who eat this unhealthy diet, those who have a higher calcium intake also have a lower risk of colon cancer. The reason for this may be that calcium in the colon binds and neutralizes cancer-causing substances, such as fats and bile acids, which are produced by the Western diet.31
The recommendation to increase your calcium intake, rather than change to a healthy diet, makes good economic sense for the dairy and calcium supplement industry. However, as a sensible person, you would come to the conclusion that stopping the cause of colon cancer – the Western diet – should be the focus of your attention.
False Promise #9: Low-fat Dairy Products are Health Food
Low-fat or skim milk and dairy products are widely consumed today, but in some ways they may be even more of a health hazard than the high-fat versions. The process of skimming the fat from the milk increases the relative proportions of protein and lactose.
Making Low-fat Milk
When the fat is removed from whole milk to make low-fat and skim milk the relative amounts of proteins and carbohydrates (sugars) are increased.4
|
|
Whole
|
Low-fat
|
Skim
|
|
Fat
|
49%
|
31%
|
2%
|
|
Protein
|
21%
|
28%
|
41%
|
|
CHO
|
30%
|
41%
|
57%
|
CHO = carbohydrate = lactose = milk sugar
Protein causes calcium loss10,11 and is the #1 source of food allergies in people; and the milk sugar (lactose) results in lactose intolerance (diarrhea, stomach cramps and gas). Although skim milk may have less fat, it is still devoid of fiber; and contains insufficient amounts of vitamins, like C and niacin, and minerals, like iron, to meet the human body's needs.4
False Promise #10: Milk Is As Pure White As Fresh Fallen Snow
Milk may be white but it is far from pure. Unfortunately, some of that white comes from white blood cells – commonly referred to as “pus cells” – which are cells produced by the cow's immune system to fight off infections, especially those of bacterial origin, such as mastitis. The dairy industry calls these somatic cells and refers to their presence as the somatic cell count (SCC). The SCC is the number of (mostly) white blood cells per milliliter (cells/ml) of milk. (There are 20 drops per milliliter; 30 milliliters to an ounce)
Beginning July 1, 1993, the SCC level in milk must be less than 750,000 SCC to comply with the State and Federal Pasteurized Milk Ordinance.32 This means one 8 ounce glass of milk (240 milliliters) can contain 180 million white blood cells and still be fine for you to drink and feed to your family. In a recent study of milk sold in New York State the average SCC was 363,000 cells/ml.33 These white blood cells were produced by the cow to fight off the 24,400 bacteria/ml found in this milk.
I realize this is a disgusting way to end this article, but I must prepare you for next month’s article concerning the health risks you take for yourself and your family by consuming dairy products, such as obesity, heart disease, cancer, type-I diabetes, food allergies, and the potential for infections with AIDS and leukemia viruses found in almost all vats of milk in the United States.
References:
1) McDougall J. The McDougall Program for Women. Plume, 2000. Pages 59-70.
2) Cesar JA. Impact of breast feeding on admission for pneumonia during postneonatal period in Brazil: nested case-control study. BMJ. 1999 May 15;318(7194):1316-20.
3) McDougall J. The McDougall Plan. New Win Publ. 1983; page 101.
4) J Pennington. Bowes & Church’s Food Values of Portions Commonly Used. 17th Ed. Lippincott. Philadelphia- New York. 1998.
5) Abrams CA. Hazards of overconcentrated milk formula. Hyperosmolality, disseminated intravascular coagulation and gangrene. JAMA. 1975 Jun 16;232(11):1136-40.
6) Belton NR. Clinical and biochemical assessment of a modified evaporated milk for infant feeding. Arch Dis Child. 1977 Mar;52(3):167-75.
7) Hegsted D. Fractures, calcium and the modern diet. Am J Clin Nutr 74: 571-3, 2000.
8) Walker A. The influence of numerous pregnancies and lactations on bone dimensions in South African Bantu and caucasian mothers. Clin Science 42:l89-196, l972.
9) Smith R. Epidemiologic Studies of Osteoporosis in Women of Puerto Rico and Southeastern Michigan with Special Reference to Age, Race, National Origin, and to Other Related or Associated Findings. Clin Orthop 45:31-48, 1966.
10) Barzel US, Massey LK. Excess dietary protein can adversely affect bone. J Nutr. 1998;128:1051‑3.
11) Abelow B. Cross-cultural association between dietary animal protein and hip fracture: a hypothesis. Calcific Tissue Int 50:14-8, 1992.
12) Weinsier R. Dairy foods and bone health: examination of the evidence.
Am J Clin Nutr. 2000 Sep;72(3):681-9.
Am J Clin Nutr. 2000 Sep;72(3):681-9.
13) Recker R. The effect of milk supplements on calcium metabolism, bone metabolism and calcium balance. Am J Clin Nutr. 1985 Feb;41(2):254-63.
14) Paterson C. Calcium requirements in man: a critical review. Postgrad Med J 54:244-8, 1978.
15) Kanis J. The use of calcium in the management of osteoporosis. Bone 24:279-90, 1999.
16) Spencer H. Influence of dietary calcium intake on Ca(47) absorption in man. Am J Med 46:197-205, 1969.
17) Hegsted D. A study of minimum calcium requirements of adult men. J Nutr 46:181-120, 1952.
18) Symposium on human calcium requirements. JAMA 185:588-93, 1963.
19) Goodhart and Shils, Modern Nutrition in health and disease (Dietotherapy), 5th ed. 1973 p. 274.
20) Walker A. Osteoporosis and calcium deficiency. Am J Clin Nutr 16:327, 1965.
21) Tucker KL. Potassium, magnesium, and fruit and vegetable intakes are associated with greater bone mineral density in elderly men and women. Am J Clin Nutr. 1999 Apr;69(4):727-36.
22) New S. Dietary influences on bone mass and bone metabolism: further evidence of a positive link between fruit and vegetable consumption and bone health. Am J Clin Nutr 71:142-151,2000.
23) Ilich J. Nutrition in bone health revisited: a story beyond calcium. J Am Coll 19:715-37, 2000.
24) Cohen A. Review of risk factors for osteoporosis with particular reference to a possible aetiological role of dietary salt. Food Chem Toxicol. 38:237-53, 2000.
25) Holick M. Environmental factors that influence the cutaneous production of vitamin D. Am J Clin Nutr. 1995 Mar;61(3 Suppl):638S-645S.
26) Stamp T. Comparison of oral 25-hydroxycholecalciferol, vitamin D, and ultraviolet light as determinants of circulating 25-hydroxyvitamin D. Lancet. 1977 Jun 25;1(8026):1341-3.S
27) Norris J. Can the sunshine vitamin shed light on type 1 diabetes? Lancet 2001 358:1476-77.
28) The influence of dietary and nondietary calcium supplementation on blood pressure: an updated metaanalysis of randomized controlled trials. Am J Hypertens. 1999 Jan;12(1 Pt 1):84-92.
29) Weisburger J. Causes, relevant mechanisms, and prevention of large bowel cancer.
Semin Oncol. 1991 Aug;18(4):316-36.
Semin Oncol. 1991 Aug;18(4):316-36.
30) Mason JB. Nutritional chemoprevention of colon cancer. Semin Gastrointest Dis. 2002 Jul;13(3):143-53.
31) Holt R. Dairy foods and prevention of colon cancer: human studies. J Am Coll Nutr. 1999 Oct;18(5 Suppl):379S-391S.
32) Adkinson RW. Implications of proposed changes in bulk tank somatic cell count regulations. J Dairy Sci. 2001 Feb;84(2):370-4.
33) van Schaik G. Trends in somatic cell counts, bacterial counts, and antibiotic residue violations in New York State during 1999-2000. J Dairy Sci. 2002 Apr;85(4):782-9.
參考譯文：
niunairucongtianerjiangdexueyiyangjiebai，rangrenxiangqimuqinwennuandehuaibao。changshizengrangwoxiangxin，jiranniunaikeyizuoweiyingerweiyideyingyanglaiyuan，nametayidingshitianrandezuiwanmeideshipin。niunaiqiangzhuangguge──我反複被告知──既ji然ran體ti內nei最zui堅jian硬ying的de骨gu骼ge大da多duo由you鈣gai組zu成cheng，那na麼me富fu含han鈣gai質zhi的de牛niu奶nai對dui於yu維wei持chi我wo骨gu骼ge的de力li量liang和he平ping衡heng來lai說shuo，是shi必bi不bu可ke少shao的de。你ni終zhong生sheng都dou需xu要yao牛niu奶nai，因yin為wei你ni身shen體ti對dui牛niu奶nai的de需xu求qiu是shi永yong不bu滿man足zu的de，乳ru製zhi品pin業ye如ru此ci宣xuan傳chuan。這zhe些xie"事實"一直是"真的"，然而，當我花點時間去認真地思考牛奶的作用，並查閱大量的科學文獻後，我得出了一些讓我感到意外的結果。
一、母乳才是最佳食品
例如牛奶對小牛、貓奶對小貓、馬奶對小馬，隻有在同一物種之內，母乳才是嬰兒的最佳食品，對於斷奶後、青少年、成年人來說，母乳也不是最佳食品。哺乳動物用乳腺分泌的乳汁來哺育成長中的嬰兒。乳汁含有利於成長和生存所需的營養、抗體、激素。
母乳有多重要？人類嬰兒如果沒有乳汁：
1.患嬰兒猝死綜合症的機率大2~4倍。
2.在出生後三個月內，患肺炎的風險大60倍。
3.出生後一年內，住院機率大10倍。
4.IQ下降。
5.行為和語言障礙。
6.在生命前期，患感染、哮喘、濕疹、1型糖尿和癌症(淋巴瘤和白血病)的風險加大。
7.在生命後期，有較大機率患心髒病、肥胖症、糖尿病、多發性硬化症、食物過敏、潰瘍性結腸炎和克羅恩病。
母乳是人類嬰兒最理想的食品這一點是毋容置疑的。迄今為止，還沒有滿意的母乳替代品，因此，在出生後前6個月應該盡量隻用母乳喂養，然後，在兩歲以前，以健康的固體食品加上一部分母乳喂養。(更多信息請查閱麥克杜格爾婦女手冊)
二、母乳是物種特異性的
嬰ying兒er所suo需xu的de營ying養yang隻zhi有you在zai同tong樣yang物wu種zhong的de母mu乳ru中zhong才cai含han有you。母mu乳ru的de成cheng分fen通tong過guo上shang萬wan年nian的de進jin化hua才cai使shi得de其qi符fu合he該gai物wu種zhong嬰ying兒er的de需xu求qiu。讓rang我wo以yi蛋dan白bai質zhi這zhe個ge必bi需xu營ying養yang成cheng分fen為wei例li來lai解jie釋shi。
因不同物種嬰兒的生長速度不同，母乳中的蛋白質含量也不同──生長速度越快，所需蛋白質越多。
不同乳汁的蛋白質含量
* 每毫升所需克數(以卡路裏的百分比計算，牛奶比人乳的蛋白質含量高4倍：21%比5%)
** 出生後體重增加一倍所需時間
除了蛋白質含量的不同，還有其它營養成分的含量也不同：
不出意料，因為小牛增加一倍出生體重的速度比人類嬰兒快4倍，牛奶中的蛋白質和鈣含量也比人乳高4倍。高的生長速度對於各種營養成分的需求也更多。
三、營養過剩的問題
大(da)多(duo)數(shu)人(ren)認(ren)為(wei)健(jian)康(kang)問(wen)題(ti)是(shi)因(yin)為(wei)缺(que)乏(fa)營(ying)養(yang)而(er)引(yin)起(qi)的(de)，這(zhe)是(shi)維(wei)生(sheng)素(su)和(he)礦(kuang)物(wu)質(zhi)補(bu)充(chong)劑(ji)如(ru)此(ci)暢(chang)銷(xiao)的(de)原(yuan)因(yin)。但(dan)是(shi)，我(wo)的(de)患(huan)者(zhe)中(zhong)沒(mei)有(you)一(yi)個(ge)是(shi)因(yin)缺(que)乏(fa)營(ying)養(yang)而(er)患(huan)病(bing)，比(bi)如(ru)維(wei)生(sheng)素(su)C缺乏症(壞血病)、維生素B1缺乏症(腳氣病)或蛋白質缺乏症。相反，其中有很多富貴病──比如超量飲食脂肪酸(肥胖)、膽固醇(心髒病)、鹽分(高血壓)。因此，人們(嬰兒、小孩、成人)攝取如牛奶一樣的含有多餘營養成分的食品會導致富貴病。(可能你還認為牛奶可以預防鈣缺乏症，防止骨質疏鬆。請耐心地往下讀，我會向你證明這是不可信的。)
十九世紀中期，在美國，牛奶隻是作為緊急情況下人乳的替代品(比如，母親死於難產)。結(jie)果(guo)因(yin)為(wei)牛(niu)奶(nai)的(de)蛋(dan)白(bai)質(zhi)含(han)量(liang)過(guo)高(gao)導(dao)致(zhi)嬰(ying)兒(er)腎(shen)髒(zang)功(gong)能(neng)障(zhang)礙(ai)，水(shui)分(fen)從(cong)腎(shen)髒(zang)流(liu)失(shi)而(er)引(yin)發(fa)脫(tuo)水(shui)症(zheng)，引(yin)起(qi)大(da)量(liang)嬰(ying)兒(er)的(de)死(si)亡(wang)。該(gai)問(wen)題(ti)發(fa)生(sheng)後(hou)，人(ren)們(men)在(zai)嬰(ying)兒(er)配(pei)方(fang)奶(nai)中(zhong)加(jia)入(ru)糖(tang)分(fen)以(yi)降(jiang)低(di)牛(niu)奶(nai)中(zhong)蛋(dan)白(bai)質(zhi)的(de)含(han)量(liang)，使(shi)其(qi)成(cheng)分(fen)比(bi)更(geng)接(jie)近(jin)人(ren)類(lei)。如(ru)果(guo)你(ni)年(nian)紀(ji)比(bi)較(jiao)大(da)，可(ke)能(neng)還(hai)會(hui)記(ji)得(de)衝(chong)調(tiao)或(huo)飲(yin)用(yong)康(kang)乃(nai)馨(xin)牌(pai)的(de)奶(nai)粉(fen)和(he)卡(ka)羅(luo)牌(pai)糖(tang)漿(jiang)組(zu)成(cheng)的(de)嬰(ying)兒(er)配(pei)方(fang)奶(nai)(這對於嬰兒來說，是非常不健康的配方奶，請不要再使用)。
考慮一下牛奶的真正用途。它是從出生體重60磅長到600磅準備斷奶的小牛的最佳食物。牛奶是高"辛烷值"的燃料。人們飲用牛奶就會導致一個明顯的結果──快速變胖。在西方國家中，乳製品對於影響25%兒童和65%成年人的超重的流行負主要責任。如果牛奶被製成更高營養含量的食品，如奶酪，其帶來的問題更多。
牛奶中也缺乏一些重要的營養成分。其中，完全缺乏纖維素、缺少維生素和礦物質，比如維生素C、尼克酸、鐵，這些都是人體所需的營養成分。
謊言1：牛奶強壯骨骼
如果你問人們，為什麼要喝牛奶？他們通常會說為了其中的鈣。牛奶中含有大量的鈣，於是它的支持者將此證據"擠"出chu來lai了le。其qi實shi，與yu上shang麵mian表biao格ge中zhong的de其qi它ta兩liang種zhong乳ru汁zhi的de鈣gai含han量liang相xiang比bi，牛niu奶nai不bu是shi維wei持chi骨gu骼ge健jian康kang的de理li性xing選xuan擇ze。牛niu奶nai中zhong的de鈣gai含han量liang比bi人ren乳ru中zhong的de高gao四si倍bei。如ru果guo在zai我wo們men生sheng命ming中zhong生sheng長chang最zui快kuai的de階jie段duan(嬰兒在六個月內體重增倍)都dou不bu需xu要yao如ru此ci高gao含han量liang的de鈣gai，當dang我wo們men成cheng人ren停ting止zhi生sheng長chang後hou，為wei什shen麼me還hai需xu要yao如ru此ci多duo的de鈣gai？當dang然ran，相xiang對dui於yu人ren類lei較jiao小xiao的de骨gu骼ge，牛niu的de骨gu骼ge較jiao大da，所suo需xu的de鈣gai也ye就jiu多duo。
世shi界jie範fan圍wei內nei上shang數shu十shi億yi的de人ren斷duan奶nai後hou不bu再zai飲yin用yong牛niu奶nai，成cheng人ren後hou，他ta們men的de骨gu骼ge也ye是shi正zheng常chang的de。比bi如ru，非fei洲zhou的de班ban圖tu婦fu女nv完wan全quan不bu飲yin奶nai，而er是shi通tong過guo蔬shu菜cai來lai獲huo取qu每mei天tian所suo需xu的de250~400毫克的鈣(大約是美國推薦攝入量的一半)。這些婦女大多有十個孩子，每個孩子的哺乳期大約是10個ge月yue。盡jin管guan不bu飲yin奶nai，而er且qie在zai懷huai疑yi和he哺bu乳ru期qi間jian還hai消xiao耗hao大da量liang鈣gai質zhi，她ta們men幾ji乎hu都dou不bu會hui出chu現xian骨gu質zhi疏shu鬆song。但dan是shi，當dang土tu著zhu非fei洲zhou婦fu女nv移yi居ju到dao大da城cheng市shi或huo移yi民min到dao西xi方fang國guo家jia，遵zun循xun富fu含han鈣gai質zhi的de飲yin食shi後hou，骨gu質zhi疏shu鬆song症zheng開kai始shi發fa生sheng。你ni可ke能neng會hui馬ma上shang想xiang到dao這zhe是shi因yin為wei她ta們men的de飲yin食shi變bian得de富fu含han動dong物wu蛋dan白bai了le。
不同國家的數據不支持乳製品業宣稱的益處。傳統高消費乳製品的國家(美國、瑞典、以色列、芬蘭、英國)通常有較高的骨質疏鬆引起的髖骨骨質，而傳統低消費乳製品地區(香港、新加坡、非洲農村)的骨質疏鬆症發生率較低。
如ru果guo攝she取qu鈣gai很hen關guan鍵jian，而er牛niu奶nai又you是shi鈣gai質zhi的de良liang好hao來lai源yuan，為wei什shen麼me還hai有you一yi千qian多duo萬wan的de美mei國guo人ren患huan骨gu質zhi疏shu鬆song症zheng？增zeng加jia鈣gai攝she入ru的de這zhe個ge存cun在zai已yi久jiu的de建jian議yi對dui於yu降jiang低di美mei國guo骨gu質zhi疏shu鬆song或huo骨gu質zhi的de流liu行xing隻zhi有you有you限xian或huo完wan全quan沒mei有you作zuo用yong。
世界範圍內，骨質疏鬆症的發生與動物蛋白的攝取量有直接和有力的聯係。高度酸性的動物蛋白是引起骨質流失的重要原因。(你可以在www.drmcdougall.com 閱讀麥克杜格爾2003年2月份上的"魚肉不是健康食品"。)
謊言2：研究支持乳製品的益處
2000年九月份，兩位研究者總結了1985nianyilaifabiaodeguanyuruzhipinhegugejiankangdekexuewenxian。gaizongshufabiaozaimeiguolinchuangyingyangzazhishang。buchusuoliao，daduoshukexuewenxiandoushiyouruzhipinyetigongzijin。yanjiuzhecheng，qizhong53%的文獻表明乳製品的益處無科學證據。然後，研究者排除了證據差或技術差的研究，這樣至少將一半的研究給排除了。剩下的21個研究中，57%的顯示乳製品的益處無科學證據，其它14%甚至顯示乳製品有害骨骼健康。想一下這意味著什麼──71%的科學性良好的研究不支持乳製品的益處，甚至一些顯示有害。
隨機對照實驗比較實驗組和對照組，它被認為是最科學的科學研究。在7個關於乳製品對骨骼健康的隨機對照實驗中，有6個由乳製品業資助。隻有一個研究能從液體牛奶中獲益最大的婦女：絕經後的婦女。在這個研究中，實驗組的婦女一年中每天三次飲用8盎司的脫脂牛奶，但是她們仍然流失比吸收更多的鈣(她們的鈣平衡處於負的狀態)。盡管她們每天攝入1400duohaokedegai，danshiheduizhaozudefeiyinnaifunvxiangbi，tamendegailiushisudukuailiangbei。suiranruci，ruzhipinyehaishijixubuyiyulidixuanchuanruzhipinduigugejiankangdehaochu。
謊言3：乳製品使你的鈣的攝入量簡單地達到推薦量
防止骨質疏鬆症的鈣的推薦攝入量如此之高，以致要通過正常飲食來達到該標準變得很困難(如果不是不可能)。美國國立衛生研究所和國家骨質疏鬆基金會推薦對於絕境後而又沒有服用雌激素的婦女每天攝取1500毫克的鈣，對於65歲或以上的老年人也要每天攝取1500毫克的鈣。如果其中300~400毫克的鈣來源於碳水化合物、蔬菜、水果、蛋類、禽類、魚肉、肉類，剩下的1200毫克就不得不從乳製品中獲得。一個靜坐生活方式的絕經後的婦女評價每天消耗1500卡路裏。如果要達到推薦的鈣攝入量，她所需要食用的乳製品量：
6盎司的切達乳酪(脂肪含量74%)。從乳酪中獲得卡路裏將占總卡路裏46%；
1誇脫(32盎司)的全脂牛奶(脂肪含量50%)，從全脂牛奶中獲得的卡路裏將占總卡路裏的40%；
1誇脫的脫脂牛奶(32盎司)的脫脂牛奶(脂肪含量3%)，從脫脂牛奶中獲得的卡路裏將占總卡路裏的23%；
乳品業對這些過高的推薦量持樂觀態度，但是每天消耗這麼多的牛奶替代其它更加飽腹(滿意)和營養的食物，這是不健康的。
謊言4：每天我們需要1500毫克的鈣
我們真正所需鈣遠遠少於推薦量。科學研究證明我們每天隻需150~200毫克的鈣，即使在懷孕或哺乳期間也是如此。
考慮下鈣攝入量和推薦量不同：
為什麼關於鈣的攝入量和推薦量如此不同？簡單地解釋就是你在食物中攝取的鈣對最終吸收進身體和骨骼健康的影響是微小的。
你ni的de腸chang道dao總zong是shi會hui從cong進jin食shi的de食shi物wu中zhong獲huo取qu滿man足zu你ni需xu求qiu的de足zu量liang的de鈣gai。如ru果guo飲yin食shi中zhong的de鈣gai含han量liang低di，腸chang道dao對dui鈣gai吸xi收shou的de效xiao率lv增zeng加jia，這zhe樣yang就jiu能neng吸xi收shou更geng多duo的de鈣gai。如ru果guo飲yin食shi中zhong鈣gai含han量liang高gao，多duo餘yu的de鈣gai就jiu會hui在zai未wei吸xi收shou的de狀zhuang態tai下xia以yi排pai泄xie物wu的de形xing式shi排pai出chu體ti外wai。腸chang道dao係xi統tong對dui於yu鈣gai吸xi收shou的de調tiao節jie十shi分fen智zhi能neng，總zong是shi能neng滿man足zu機ji體ti對dui鈣gai的de需xu求qiu。如ru果guo你ni追zhui溯su營ying養yang研yan究jiu的de科ke學xue文wen獻xian到dao最zui近jin的de一yi百bai年nian前qian，你ni會hui發fa現xian沒mei有you證zheng據ju表biao明ming食shi物wu中zhong鈣gai缺que會hui發fa生sheng在zai人ren類lei身shen上shang，盡jin管guan世shi界jie上shang的de大da多duo數shu人ren斷duan奶nai後hou並bing不bu飲yin牛niu奶nai──可能出於風俗、乳糖不耐受、牛奶不在本地區生產等原因。所以說並不存在"鈣缺乏症"這個疾病──如果你又想到骨質疏鬆症──請記住，世界上，鈣攝入量最低的國家的人卻擁有最強壯的骨骼，最低的骨質疏鬆發生率。
謊言5：牛奶是骨骼健康的最佳食品
shishishang，niunaibingbushigaideweiyilaiyuan，erqieyebushizuijialaiyuan。gaideyuantoushidadi。gaiheqitakuangwuzhirongyushuihoubeizhiwudegensuoxishou。ranhougaiconggenchuandidaojing、葉、花、果。人類也可如鈣進入牛奶的途徑一樣，從植物性飲食中獲取鈣。
duigaidesheruliangdeguoduguanzhukenenghuijiangrenmendezhuyiliheyouxiandeziyuanconggengjiazhongyaodeyingyangwentishangzhuanyi。gaibushiweiyiyingxianggugejiankangdeyingyangyuansu。yanjiuxianshi，jiahemeiduiyufangzhiguzhiliushiqidaogengdadezuoyong，ciweiβ-胡蘿卜素、磷、纖維素也具有重要作用。植物性飲食是獲得這些營養的良好來源。牛奶中不含β-胡蘿卜素和膳食纖維。更為重要的是，你不吃什麼要比你吃什麼對骨骼健康的影響大。某些食物和物質──比如動物蛋白、煙草、碳酸飲料、咖啡、鹽──都會影響你機體對抗鈣流失，影響你吸收和利用鈣的能力。
謊言6：牛奶對維生素D的獲取是必需的
有些人支持牛奶中的維生素D在健康飲食中扮演一個很重要的角色。但是這不是事實。維生素D不算是真正的維生素，它是一種機體對陽光反應而產生的激素。而且維生素D並不天然存在於牛奶中，他是在牛奶加工過程中被添加的。這是為了預防佝僂病而添加的，佝僂病是一種因維生素D缺(que)乏(fa)而(er)引(yin)起(qi)痛(tong)苦(ku)的(de)畸(ji)形(xing)骨(gu)骼(ge)。實(shi)際(ji)上(shang)，佝(gou)僂(lou)病(bing)是(shi)因(yin)為(wei)日(ri)照(zhao)不(bu)足(zu)引(yin)起(qi)的(de)，機(ji)體(ti)內(nei)的(de)維(wei)生(sheng)素(su)水(shui)平(ping)受(shou)飲(yin)食(shi)因(yin)素(su)的(de)影(ying)響(xiang)很(hen)小(xiao)。我(wo)們(men)在(zai)夏(xia)季(ji)獲(huo)得(de)的(de)日(ri)照(zhao)會(hui)影(ying)響(xiang)我(wo)們(men)全(quan)年(nian)的(de)維(wei)生(sheng)素(su)D水平。機體中90%以上的維生素D來源於日照。每周隻需3次日照臉部和手臂15分鍾，我們就能獲得足量的維生素D。但是，這個作用會受到防曬霜和膚色的影響。基本上，通過日常活動，我們就能獲得滿足每天所需的維生素D，我們並不需要通過飲用牛奶來獲取它。再說，維生素D是脂溶性的，這樣它就可以儲存在我們的機體內很長一段時間，在冬天低日照的情況下，我們也能獲得足量維生素D。
謊言7：牛奶可以治療高血壓
國家奶業委員會通過評價飲食鈣(乳製品)和非飲食鈣(補充劑)的補充對血壓的影響，從而得出一個可以保證的結論"鈣的補充可以輕微降低血壓的收縮壓(最高值)和舒張壓(最低值)"。在67個研究中，有47個符合評價標準。血壓的實際下降值毫無意義：收縮壓降低1.44mmHg，舒張壓降低0.84mmHg。攝入鈣導致血壓輕微下降的機製還不清楚。
相對的是，麥克道格爾居民中心的結果顯示高血壓(150/90mmHg或更高)的人群飲用植物性飲食不到10天，血壓就下降了23/14mmHg。這些人大多數在這10天內都沒服用抗高血壓藥物。
謊言8：牛奶預防結腸癌
結腸癌是美國和其它西方飲食流行地區人們的常見癌症。科學界一致認為結腸癌是由高動物蛋白、高脂肪、低膳食纖維、低(di)蔬(shu)菜(cai)飲(yin)食(shi)引(yin)起(qi)的(de)。但(dan)是(shi)，在(zai)這(zhe)些(xie)食(shi)用(yong)不(bu)健(jian)康(kang)飲(yin)食(shi)的(de)人(ren)群(qun)中(zhong)，鈣(gai)攝(she)入(ru)量(liang)高(gao)的(de)人(ren)患(huan)結(jie)腸(chang)癌(ai)的(de)風(feng)險(xian)也(ye)低(di)。可(ke)能(neng)的(de)原(yuan)因(yin)是(shi)結(jie)腸(chang)中(zhong)的(de)鈣(gai)結(jie)合(he)和(he)中(zhong)和(he)了(le)引(yin)起(qi)癌(ai)症(zheng)的(de)物(wu)質(zhi)，例(li)如(ru)西(xi)方(fang)飲(yin)食(shi)中(zhong)存(cun)在(zai)的(de)脂(zhi)肪(fang)和(he)膽(dan)汁(zhi)酸(suan)。
乳ru製zhi品pin業ye建jian議yi你ni攝she取qu更geng多duo的de鈣gai，而er不bu是shi改gai變bian飲yin食shi習xi慣guan，這zhe對dui於yu乳ru製zhi品pin業ye和he鈣gai補bu充chong劑ji生sheng產chan商shang來lai說shuo，是shi有you利li的de。但dan是shi，作zuo為wei理li性xing的de人ren，你ni應ying該gai已yi經jing得de出chu結jie論lun:停止結腸癌的根本原因──西方飲食──才該是你注意力的中心。
謊言9：低脂牛奶是健康食品
低(di)脂(zhi)牛(niu)奶(nai)或(huo)脫(tuo)脂(zhi)牛(niu)奶(nai)和(he)其(qi)它(ta)乳(ru)製(zhi)品(pin)如(ru)今(jin)被(bei)廣(guang)泛(fan)消(xiao)費(fei)，但(dan)是(shi)從(cong)某(mou)種(zhong)意(yi)義(yi)上(shang)說(shuo)，它(ta)們(men)可(ke)能(neng)比(bi)全(quan)脂(zhi)牛(niu)奶(nai)對(dui)健(jian)康(kang)危(wei)害(hai)更(geng)大(da)。脫(tuo)脂(zhi)的(de)過(guo)程(cheng)使(shi)得(de)牛(niu)奶(nai)中(zhong)的(de)蛋(dan)白(bai)質(zhi)和(he)乳(ru)糖(tang)含(han)量(liang)相(xiang)對(dui)地(di)增(zeng)高(gao)。
生產低脂牛奶
當脂肪從全脂牛奶中去除而獲得低脂牛奶和脫脂牛奶後，蛋白質和碳水化合物的量相對應地增加：
CHO = 碳水化合物 = 乳糖 = 牛奶中的糖
牛奶中的蛋白質引起鈣流失，而且是人群中食物過敏的首要原因，牛奶中的糖(乳糖)還會引發乳糖不耐受(腹瀉、胃痛、胃脹氣)。盡管脫脂牛奶含有的脂肪很低，但是還是缺乏纖維素，也缺乏一些重要的維生素和礦物質，例如維生素C和尼克酸、鐵，來滿足人體的需求。
謊言10：牛奶如同天降的雪一樣純潔
牛奶是白色的，但是絕對不是純潔的。不幸的是，牛奶的白色有些來自於白細胞──通常稱為膿細胞──白細胞於牛的免疫係統抵抗感染時產生，特別是因細菌引起的感染，比如乳腺炎。乳製品業把這些細胞稱為體細胞，並通過體細胞計數(SCC)來測量。體細胞計數表示牛奶中每毫升中所含白細胞數。(20滴大約為1毫升，30毫升為1盎司)
從1993年7月1日起，根據國家和聯邦巴氏殺菌奶條例，牛奶中的體細胞計數必須小於750000。這意味著，即使一杯8盎司(240毫升)的牛奶中含有1.8億的白細胞，對於你和家人也是安全的。最近一項對於紐約州銷售的牛奶的調查發現平均體細胞計數大約是363000個/毫升。與此同時發現的還有，牛奶中產生這些白細胞的原因──24400個細菌/毫升。
suiranzuoweiwenzhangdejiewei，zhegeshishikenenghuilingnifanwei，danshizheshiweixiageyuewomenjiangtaolunyinxiaofeiruzhipin，nihejiarensuomianlindejiankangfengxianzuozhunbei，birufeipang、心髒病、癌症、1型糖尿病、食物過敏和因牛奶中含有的病毒而患上艾滋病和白血病。
原文鏈接：http://www.nealhendrickson.com/mcdougall/030400pudairyproductsfalsepromises.htm
