奶類食品

專家如是觀全力避開
食物金字塔及奶類食品
http://hk.news.yahoo.com/article/110504/3/o589.html
http://hk.news.yahoo.com/article/110505/3/o5wk.html

我們一直被教導飲牛奶有益、喝奶類飲品有營養……但這一切，近年被相反的說法節節進逼，奶類有害論的聲音愈來愈大、愈來愈響。
 最新一個叫大家不要沾奶類食品或飲品的，是Mark Hyman，他是美國Institute for Functional Medicine主席，二○○九年獲Linus Pauling Award獎，是多個美國醫學會董事和顧問。Hyman博士去年公開呼籲，美國農業部發出的食物金字塔指引（給世人健康飲食的指引及方向）是垃圾，是完全錯的指引，大家千萬不要跟隨。當中涉及到奶類食品或飲品。

Hyman發表了《6 Reasons You Should Avoid It at all Costs！》，即是「六個你要不惜一切代價避開食物金字塔的理由」！堅定、大膽的題目，非常矚目。他說的六個論點是：
 一、金字塔教大家「吃多種基本食物，保持你身體能源需求」。Hyman說這聽起來很明智，其實吃哪些食物？如此廣泛模糊的建議根本毫無意義，並有危害性。
 二、金字塔教大家「控制熱量（卡路里）的吸收量來控制你的體重」。Hyman說這聽起來也合理，但即使最專業的營養師也不能約莫估計自己一天的卡路里攝入量，何況你和我呢？而且就算卡路里攝入量不超標，但你可以極度偏食（例如你整天只吃雪糕，不吃其他），這樣當然是極不健康。
 三、金字塔說「多吃水果、蔬菜、全穀物，和脫脂或低脂牛奶製品」。Hyman說多吃水果、蔬菜、全穀物是對的，但牛奶製品則No！

四、「理智地選擇澱粉質食物」。甚麼是「理智地」？根本無標準、無指引。
五、「少吃鹽」。這本身沒有錯，但如果你吃的是已製成的食品，你根本無得揀吃多少鹽，所以這沒意義。
六、「飲酒宜適量。少吃不安全的食物」。這兩句都是廢話。
好了，巧言令色全力避開奶類食品，Hyman博士援引Willett博士的研究，指出：
4奶類食品不能減少骨折率。
4少飲奶，骨骼強。
4鈣並不能對骨骼有保護作用。
4吸收鈣與吃奶類食品會增加患癌機會。
4不是每個人都能承受或吸收奶類食品。
4奶類食品可引致過敏症、鼻竇問題、耳發炎、第一型糖尿病、嚴重便秘、兒童貧血等病。
我們一直被教導飲牛奶有益、喝奶類飲品有營養，但這一切，近年被相反的說法節節進逼，奶類有害論的聲音愈來愈大、愈來愈響。
究竟人應該多喝牛奶還是不應喝牛奶呢？我不是專家，我不能代你答。就算是專家，也有不同的答案。我們在幾乎每個範疇、生活每個環節上，都遇到不同的以至相反的專家指引，究竟哪個是對、哪個是錯？可能根本沒有對與錯。
就牛奶來說，我的選擇是：飲少為上策。其他一切，皆可如是觀。

 

Dairy: 6 Reasons You Should Avoid It at All Costs
or
Why Following the USDA Food Pyramid Guidelines is Bad for Your Healthhttp://www.huffingtonpost.com/dr-mark-hyman/dairy-free-dairy-6-reason_b_558876.html

Got milk?

These days, it seems like almost everybody does. Celebrities, athletes, and even former president Clinton's head of Health and Human Services, Donna Shalala, are all proud to wear the white "milk mustache." After all, everyone knows that you need milk to be healthy ...

Dairy is nature's perfect food -- but only if you're a calf.

If that sounds shocking to you, it's because very few people are willing to tell the truth about dairy. In fact, criticizing milk in America is like taking on motherhood, apple pie, or baseball. But that's just what I'm about to do.

Based on the research and my experience practicing medicine, I typically advise most of my patients to avoid dairy products completely. I like ice cream just as much as the next person, but as a scientist I have to look honestly at what we know. In today's blog I will explore many of the documented ill-effects of dairy, and give you six reasons you should avoid dairy at all costs.


The Reason I Have Problems with the USDA Food Pyramid
I'm aware that my advice to avoid dairy flies in the face of the new, "up-to-date" food pyramid from the United States Department of Agriculture (USDA). The USDA's pyramid recommends drinking 3 glasses of milk a day. What's wrong with that? Well, for one thing, it's not a recommendation that's based on strict science.

Some of the "experts" who helped create the pyramid actually work for the dairy industry, which makes the US Department of agriculture's recommendations reflect industry interests, not science or our best interests.

In fact, Walter Willet, M.D., Ph.D -- the second-most-cited scientist in all of clinical medicine and the head of nutrition at Harvard's School of Public Health -- is one of the pyramid's most vocal critics. He's even called its guidelines "udderly ridiculous." That's not something a Harvard scientist says lightly.

But Dr. Willett is right. The pyramid just isn't based on key scientific findings about health. In a moment we will take a look at some of the pyramid's recommendations and why I disagree with them.

But before I dissect why the current food pyramid is harmful to your health, I want to offer a bit of hope. I recently attended a medical conference put on by Harvard Medical School and the Culinary Institute of America called Healthy Kitchens, Healthy Lives and met Eric Rimm, who works closely with Walter Willett at Harvard School of Public Health and is a member of the 2010 USDA Dietary Guidelines for Americans Committee.

I asked him if he felt that science not industry would be shaping the new guidelines and he said there was now only one scientist with industry ties on the new panel and he was objective and agreeable to make changes when presented the data. I am anxious to see how the science matches policy but feel a ray of hope that for the first time in the history of our dietary guidelines we will see science predominate, not industry interests and that the language will be direct, clear and simple to understand for all Americans. The guidelines from the early 1990's promoting the consumption of 6-11 servings of bread and cereals daily led to the pasta, carb, sugar generation and led to the largest epidemic of obesity in the history of our species.

Let's hope the new guidelines for 2010 will guide us toward greater health, not an increasing burden of obesity, diabetes and chronic disease. The USDA food policy guidelines form the basis of the school lunch program and it has contributed to a tripling of obesity in children. Let's hope we can serve up a different lunch menu for our children and our nation.

The simple idea that science should become policy is unfortunately one that has found little traction in Washington. But that seems to be shifting a little now.

Now back to why the last government guidelines from 2005 are harmful to your health!

1. Consume a variety of foods within and among the basic food groups while staying within your body's energy needs.

Sounds sensible -- but which food groups? If you choose dairy, meat, fats, and carbohydrates, the "perfect" meal could be a cheeseburger, milkshake, and fries with ketchup (potatoes and tomatoes are the two top vegetables consumed in America). Generic advice like that is pretty meaningless and potentially harmful.

2. Control your caloric intake to manage body weight.

Again, that sounds good, but as I wrote in my book UltraMetabolism, even the best-trained nutritionists and dietitians can't come close to correctly estimating their own caloric intake in a day. Also consider this: Is it okay to consume all of your calories from cola or ice cream as long as you stay within my caloric needs? Of course not. So this is more useless advice.

3. Increase intake of fruits and vegetables, whole grains, and nonfat or low-fat milk products.

Well, fruits, veggies, and whole grains are great. Milk -- not so much. I'll get back to that in a minute.

4. Choose carbohydrates wisely.

Who could argue with that? But how do they define "wisely"? The real advice here should be to cut down sugar intake from 185 pounds per person per year (what we currently consume) to less than a pound, avoid flour products (except as a treat), and stick to whole-food carbohydrates like vegetables, fruit, whole grains, beans, nuts, and seeds.

5. Choose to prepare food with little salt.

That's not bad advice. But it doesn't make sense if most of what you eat is packaged or processed foods that you don't actually prepare. For most Americans who eat half of their meals outside their homes, this isn't helpful. A better recommendation would be to avoid packaged, processed, canned, prepared, and fast foods (unless you know exactly how they are made).

6. If you drink alcoholic beverages, do so in moderation.

Sounds good -- but if you're usually drinking two bottles of wine a night, then one seems like moderation! I think a better suggestion is to limit your alcohol consumption to half a drink a day or 3 glasses a week (the amount that seems to have the most health benefit).

7. Don't eat unsafe foods.

Of course you shouldn't leave your egg salad out in the hot sun or toss your salad with hands that just handled raw chicken coated with salmonella. But the food pyramid guidelines don't mention pesticides, hormones, antibiotics, or genetically modified foods, despite scientific evidence of their harm. Shame on the USDA!

You can see now why I have big problems with the food pyramid! Its guidelines try to sound sensible -- while still protecting the interests of the food industry, the agriculture industry, and all of the lobbyists paying for the elections of the Congress. That way everybody's happy ...

But I'm not, and you shouldn't be either. The public just isn't served by this watered down, confusing, and useless pyramid. The next guidelines, I hope will be better, especially with independent scientists like Eric Rimm involved. Worse, some of the recommendations are downright harmful --like the one to drink more milk and dairy products.
The Truth about Dairy
According to Dr. Willett, who has done many studies and reviewed the research on this topic, there are many reasons to pass up milk, including:

1. Milk doesn't reduce fractures.(i) Contrary to popular belief, eating dairy products has never been shown to reduce fracture risk. In fact, according to the Nurses' Health Study dairy may increase risk of fractures by 50 percent!

2. Less dairy, better bones. Countries with lowest rates of dairy and calcium consumption (like those in Africa and Asia) have the lowest rates of osteoporosis.

3. Calcium isn't as bone-protective as we thought.(ii) Studies of calcium supplementation have shown no benefit in reducing fracture risk. Vitamin D appears to be much more important than calcium in preventing fractures.

4. Calcium may raise cancer risk. Research shows that higher intakes of both calcium and dairy products may increase a man's risk of prostate cancer by 30 to 50 percent.(iii) Plus, dairy consumption increases the body's level of insulin-like growth factor-1 (IGF-1) -- a known cancer promoter.

5. Calcium has benefits that dairy doesn't. Calcium supplements, but not dairy products, may reduce the risk of colon cancer.(iv)

6. Not everyone can stomach dairy.(v) About 75 percent of the world's population is genetically unable to properly digest milk and other dairy products -- a problem called lactose intolerance.

Based on such findings, Dr. Willet has come to some important conclusions:

• Everybody needs calcium -- but probably not as much as our government's recommended daily allowance (RDA) and calcium from diet, including greens and beans is better utilized by the body with less risk than calcium supplements.

• Calcium probably doesn't prevent broken bones. Few people in this country are likely to reduce their fracture risk by getting more calcium.

• Men may not want to take calcium supplements. Supplements of calcium and vitamin D may be reasonable for women.

• Dairy may be unhealthy. Advocating dairy consumption may have negative effects on health.

If all that isn't enough to swear you off milk, there are a few other scientific findings worth noting. The Federal Trade Commission (FTC) recently asked the UDSA to look into the scientific basis of the claims made in the "milk mustache" ads. Their panel of scientists stated the truth clearly:

• Milk doesn't benefit sports performance.

• There's no evidence that dairy is good for your bones or prevents osteoporosis -- in fact, the animal protein it contains may help cause bone loss!

• Dairy is linked to prostate cancer.

• It's full of saturated fat and is linked to heart disease.

• Dairy causes digestive problems for the 75 percent of people with lactose intolerance.

• Dairy aggravates irritable bowel syndrome.

Simply put, the FTC asked the dairy industry, "Got Proof?" -- and the answer was NO!

Plus, dairy may contribute to even more health problems, like:

• Allergies (vi)

• Sinus problems

• Ear infections

• Type 1 diabetes (vii)

• Chronic constipation (viii)

• Anemia (in children)

Due to these concerns, many have begun to consider raw milk an alternative. But that isn't really a healthy form of dairy either ...

Yes, raw, whole, organic milk eliminates concerns like pesticides, hormones, antibiotics, and the effects of homogenization and pasteurization -- but to me, these benefits don't outweigh dairy's potential risks.

From an evolutionary point of view, milk is a strange food for humans. Until 10,000 years ago we didn't domesticate animals and weren't able to drink milk (unless some brave hunter-gather milked a wild tiger or buffalo!).

If you don't believe that, consider this: The majority of humans naturally stop producing significant amounts of lactase - the enzyme needed to properly metabolize lactose, the sugar in milk -- sometime between the ages of two and five. In fact, for most mammals, the normal condition is to stop producing the enzymes needed to properly digest and metabolize milk after they have been weaned.

Our bodies just weren't made to digest milk on a regular basis. Instead, most scientists agree that it's better for us to get calcium, potassium, protein, and fats from other food sources, like whole plant foods -- vegetables, fruits, beans, whole grains, nuts, seeds, and seaweed.

So here is my advice for dealing with dairy.
6 Tips for Dealing with Dairy
• Take your Cow for a Walk. It will do you much more good than drinking milk.

• Don't rely on dairy for healthy bones. If you want healthy bones, get plenty of exercise and supplement with 2,000 IU of vitamin D daily.

• Get your calcium from food. These include dark green leafy vegetables, sesame tahini, sea vegetables, and sardines or salmon with the bones.

• Try giving up all dairy. That means eliminate milk, cheese, yogurt, and ice cream for two weeks and see if you feel better. You should notice improvements with your sinuses, post-nasal drip, headaches, irritable bowel syndrome, energy, and weight. Then start eating dairy again and see how you feel. If you feel worse, you should try to give it up for life.

• If you can tolerate dairy, use only raw, organic dairy products. I suggest focusing on fermented products like unsweetened yogurt and kefir, occasionally.

• If you have to feed your child formula from milk, don't worry. The milk in infant formula is hydrolyzed or broken down and easier to digest (although it can still cause allergies). Once your child is a year old, switch him or her to real food and almond milk.

Still got milk? I hope not! Remember, dairy is not crucial for good health. I encourage you to go dairy-free and see what it does for you.

Now I'd like to hear from you ...

Do you agree or disagree that dairy is bad for you?

Have you experienced any problems consuming dairy?

What changes -- for better or worse -- have you experienced if you've tried eliminating dairy?

Please let me know your thoughts by leaving a comment below...

To your good health,

Mark Hyman, MD
References
(i) Feskanich D, Willett WC, Stampfer MJ, Colditz GA. Milk, dietary calcium, and bone fractures in women: a 12-year prospective study. Am J Public Health. 1997 Jun;87(6):992-7.

(ii) Feskanich D, Willett WC, Colditz GA. Calcium, vitamin D, milk consumption, and hip fractures: a prospective study among postmenopausal women. Am J Clin Nutr. 2003 Feb;77(2):504-11.

(iii) Tseng M, Breslow RA, Graubard BI, Ziegler RG. Dairy, calcium, and vitamin D intakes and prostate cancer risk in the National Health and Nutrition Examination Epidemiologic Follow-up Study cohort. Am J Clin Nutr. 2005 May;81(5):1147-54.

(iv) Huncharek M, Muscat J, Kupelnick B. Colorectal cancer risk and dietary intake of calcium, vitamin D, and dairy products: a meta-analysis of 26,335 cases from 60 observational studies. Nutr Cancer. 2009;61(1):47-69.

(v) Brannon PM, Carpenter TO, Fernandez JR, Gilsanz V, Gould JB, Hall KE, Hui SL, Lupton JR, Mennella J, Miller NJ, Osganian SK, Sellmeyer DE, Suchy FJ, Wolf MA. NIH Consensus Development Conference Statement: Lactose Intolerance and Health. NIH Consens State Sci Statements. 2010 Feb 24;27(2).

(vi) Bartley J, McGlashan SR. Does milk increase mucus production? Med Hypotheses. 2010 Apr;74(4):732-4.

(vii) Luopajärvi K, Savilahti E, Virtanen SM, Ilonen J, Knip M, Akerblom HK, Vaarala O. Enhanced levels of cow's milk antibodies in infancy in children who develop type 1 diabetes later in childhood. Pediatr Diabetes. 2008 Oct;9(5):434-41.

(viii) El-Hodhod MA, Younis NT, Zaitoun YA, Daoud SD. Cow's milk allergy related pediatric constipation: Appropriate time of milk tolerance. Pediatr Allergy Immunol. 2009 Jun 25.

Mark Hyman, M.D. practicing physician and founder of The UltraWellness Center is a pioneer in functional medicine. Dr. Hyman is now sharing the 7 ways to tap into your body's natural ability to heal itself. You can follow him on Twitter, connect with him on LinkedIn, watch his videos on Youtube and become a fan on Facebook.