QuilterInVA -
I am sorry, QuilterInVA, but I am science teacher and I vehemently disagree with your statement. I also have watched numerous documentaries recently with experts in nutrition/obesity saying the exact opposite of what you are saying.
Quote:
Studies Where Calories are Rigorously Controlled
The first set of studies, which tend to be in the minority are those studies where subject’s caloric intakes are strictly controlled. These are usually the studies that the ‘a calorie is a calorie’ folks use to support their argument.
These studies are typically done by locking subjects in a hospital type of situation and measuring their food intake or by giving them pre-made food packets to use at home. Sometimes, studies are done in hospital patients being fed through a feeding tube. As you might imagine, these studies are hellishly expensive (especially if they are done over more than a few days) and, for that reason, aren’t being done as often anymore.
There is also the question of whether or not they have relevance to the real-world but that’s a separate issue. I should also mention that frequently very short-term studies (looking at a single meal or a day or two of intake) sometimes find differences for different diets but these have no bearing in the real-world where you’re looking at intakes over weeks or months.
However, in those studies, you generally see minimal (if any) differences in terms of the amount or composition of the weight lost when you vary the different nutrients. Studies have compared high to low-carbohydrate diets and even varying low-carbohydrate diets. With minor variation (maybe a pound or two here or there), any differences in the total amount of weight loss or the composition of the weight lost (again this assumes adequate protein intake in the first place) are very minor. Rather, the majority (easiliy 90% or more) of the change can be attributed directly to the caloric intake of the diet. Macronutrient composition makes a tiny, approaching negligble difference.
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Summing up this mini-section: for the most part, studies where protein is adequate (or at least close to it), varying carbs and fats within the context of an identical caloric intake tends to have a minimal overall effect. What effect is occasionally seen tends to be small and highly variable (some subjects do better with one diet than another but there’s no consistent advantage). With the possible exception of extreme conditions (folks looking for super-leanness or folks who are super-obese), caloric intake is the greater determinant of results than the macronutrient composition.
Studies Where Calories are not Rigorously Controlled
As you might have guessed, these are generally the studies that the ‘a calorie is NOT a calorie’ folks refer to. In actuality, there are two different sets of studies in this group. The first is studies which are looking at nutrient intake on various diets. In such studies, subjects are simply given dietary guidelines (such as reduce fat to below 30% or reduce carbohydrates to 50 g/day or less) and intakes are examined.
Another data set of relevance to this discussion is studies comparing different diets (for example, recent studies have compared low-carbohydrate diets to the American Heart Association diet) under more real-world free-living conditions. Generally, in those studies, the subjects are given recommendations for the diet and let go. They typically report back to the researchers at some interval and frequently food intake is determined by means of self-reporting (which I’ve mentioned can be notoriously misleading). I want to look at each since both are illuminating to this discussion, as well as to how to choose a given diet.
The studies that look at average intakes given various recommendations are important because they often point to the real reason that a given diet works. For example, in studies where folks are told to reduce fat intake below 30% (or some other value), there is frequently an initial reduction in total caloric intake. That is, when they reduce dietary fat, their total energy intake generally goes down (at least initially). This is accompanied by weight loss. But this is not because of some magical effect of dietary fat, it’s simply because they are eating less calories. Of course, longer term studies show that most people end up compensating, eating more of other foods, so the result is pretty short lived.
More here :
http://www.bodyrecomposition.com/fat...a-calorie.html