Ornish says: ???...those on the ???low-fat??? diet consumed 200 fewer calories per day...than thos on the Mediteranean diet, yet people lost more weight on the Mediterranean diet. That???s physiologically impossible.??? He???s got to be kidding! No one who could say this should have any credibility in the diet debates. Yes, it is a law of physics, not merely a law of nutrition, that if you burn more calories than you take in then you will lose weight. But it absolutely does not follow that if you increase your calorie intake, or take in more calories than you butn that you will gain weight, EVEN if you guarantee constant rates of metabolism. One reason for this is simply a matter of logic: the truth of ???A implies B??? does not imply the truth of ???not A implies not B???. That observation is sufficient to discredit Ornish???s claim. But further, the ???type??? of calorie matters: Yes, conceptually ???a calorie is a calorie??? (as ???low-fat??? proponents like to chant) as a physical unit of energy, but protein that ???has 100 calories??? is handled entirely differently by the body, has different effects on the hormonal system, insulin, etc., than 100-calories-worth of white bread. (I???m not saying that Ornish promotes white bread.) The 100-calories of protein may not (and probably won???t, on a healthy, non-calorie-restricted diet) even be used much at all as fuel, but will likely be used as building material for the body instead, while the bread will tend to be used as fuel, or will be stored as fat in the context of a high-refined-carb meal or diet. Also, it is a pretty well established nutiritional principle that the body can respond to calorie restriction in a defensive way by reducing metabolism. What Ornish claims is ???physiologically impossible??? is certainly not impossible, nor is it even unlikely, and he should be embarassed to have made the claim. Regarding some of his other comments, there is nothing uncharacteristic about an Atkins diet that is high in good, low-starch vegetables and fruits. A typical breakfast for this Atkins dieter is two eggs, half an avocado, a small peach, and a few blueberries. Yes, Atkins recognizes that meat and eggs and butter are good foods, but Atkins dieters don???t gorge themselves on these things. Frank Hummer, Ph.D., mathematics.









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