" Volgens Walter Willet's boek neemt de kans op chronische ziektes al toe bij een BMI van 23 en hoger"...
dat is écht ziek!
ze zeggen niet dat te magere mensen riskeren ook gezondheids problemen: meer botten breuken, minder weerstand tegen kou, minder weerstand tegen ziektes...
Wat zeggen ze niet is iemand met grotere e/o zwarder botten kan wel, zonder problemen 5-20 kilos meer wegen...
Sorry omdat ik 't zo zegt, europa is écht een dikke 10 jaar achter Noord-Amerika.
Walter Willet IS een Amerikaan en het is toch echt zo.
Uit beter onderzoek blijkt dat magere mensen niet meer kans hebben op ziektes. Omdat rokers vaker dunner zijn (honger verdrijf je met roken) vielen zij ook in deze categorie, evenals chronisch zieken. Haal je deze mensen uit het onderzoek, dan krijg je heel andere resultaten:
Can You Be Too Thin? It's certainly possible to be dangerously thin. Individuals with eating disorders such as anorexia nervosa and bulimia--and those with wasting diseases such as cancer, AIDS, and heart failure--can lose so much weight that they don't have enough energy or basic building blocks to keep themselves alive. What about people who are thin but don't have an eating disorder?
Some studies suggest that the connection between body mass index and premature death follows a U-shaped curve.This would mean that weighing too much--or too little-- isn't as healthy as some middle weight.
The main problem with this idea is that most of these studies included smokers and individuals with early but as-yet undetected chronic and fatal diseases. Cigarette smokers as a group weigh less than nonsmokers, in part because smoking deadens the appetite. Potentially deadly chronic diseases such as cancer, emphysema, kidney failure, and heart failure can cause weight loss even before they cause symptoms and have been diagnosed
So low weights don't necessarily cause early death. Instead, low weight is often the result of illnesses or habits that may be fatal. One way to untangle this chicken-and-egg problem in epidemiologic studies is to look only at nonsmokers and to ignore deaths in the first few years of follow-up. The most recent such efforts come from two large, long-term studies established by the American Cancer Society. Its first and second Cancer Prevention Studies included more than 1 million adults who were followed for at least 12 years.(34, 35)
They excluded smokers excluding smokers and those with a history of cancer or cardiovascular disease at baseline, or who developed a chronic disease in the first few years of follow-up.
Both studies showed a clear pattern of increasing mortality with increasing weight. These data confirm similar observations from a 27-year follow-up of more than 19,000 middle aged men in the Harvard Alumni Study (36), a 16-year follow-up of 115,000 middle-aged women in the Nurses' Health Study,(37) and a 12-year follow-up of nonsmoking Seventh-day Adventists.(38)
According to the current Dietary Guidelines for Americans a body mass index below 18.5 falls outside the healthy range. But some people manage to live long, healthy lives with a low body mass index. Here's a good rule of thumb: If you've always had a low body mass index and your weight doesn't change, don't worry. But if you start losing weight and aren't dieting or trying to lose weight, schedule a visit with your doctor to figure out why this is happening.
http://www.hsph.harvard.edu/nutritionsource/healthy_weight.html
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