Sieben wrote the following post at Wed, Sep 14 2011 10:14 PM: Because science doesn’t really have a good answer for what the “best” diet is. Actually they’ve just found out that within reason, basically nothing matters other than calories.
Well, this logic ignores that calories, in the form of protein, are used for many bodily processes other than energy, and that excess protein is excreted in the form of urea. Excess carbs are stored as body fat. Similarly, saturated fat is a major component of most of the body’s organs. For example, cook marrowbone and you will discover that the marrow is almost entirely saturated fat. It is the same thing with the brain and many other organs and, saturated fat tends to concentrate around the organs, particularly the heart and kidneys, just go ask your local butcher for kidneys with the fat still attached and you will see what I mean. Saturated fat is also the the major component in the cell wall along with cholesterol. Therefore, not all calories of saturated fat are used for energy, and fatty acids in animal fats tend to stimulate metabolism. This forms a homeostatic system whereby the more saturated fats we consume, the more energy we burn, meaning that the consumption of saturated fats tends to normalise body mass.
In contrast, carbohydrates are only used for energy, in the form of glucose, and take many minerals and vitamins to be metabolized properly, many more than for protein and animal fats, which tends to be sluggish on metabolism, leading to slow burn and a tendancy to store energy from carbs in body fat. And of course you get the roller coaster insulin response if you have too many refined carbs.
This is why those on a low carb, high fat/protein diet tend to loose weight. It is why lots of saturated fat from coconut oil tends to cause weight loss, because fats stimulate metabolism whilst carbs tend to do the opposite. Of course, the body, with sufficient nutrients, can healthily consume a portion of its calories in carbs, but modern diets are high in refined carbs which lack the minerals and vitamins the body requires to metabolise them, which is why they are particularly sluggish on metabolism and tend to particularly cause weight gain.
This is why the calorie theory of weight gain misinterprets the laws of thermodynamics, namely ignoring that the body is a dynamic system that metabolises different calories in different ways.
So Sieben is wrong in saying that simple calorie restriction works, because, counter to intuition, one finds that obese individuals tend to have mineral and vitamin deficiencies, because a person must be well nourished in order that they burn off the food they consume, because metabolism requires nutrients. The solution therefore is a nutrient dense diet without refined carbohydrates and, with restricted access to carbs if weight loss is required. It is only possible to reduce carbs and maintain nutrient density if protein and fats are consumed in liberal quantities, otherwise you will see the typical yo-yo-ing between diet and uncontrolled indulgence, and between weight loss and wieght gain.
This video of Zoe Harcombe goes into the science of it: http://vimeo.com/26994290