re: Low Fat Diet Is Allegedly Wrong According to Report

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simply put in the terms of weight loss and weight gain, we are referring to the first law of thermo. Simply if we consume an energy source it cant be destroyed only stored or used and that to lose weight you must burn more energy than you consume.

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So, no, you can not explain it in reference to metabolism and digestion.

A calorie is a terrible measure of energy in a biological setting. The amount of "energy" in a food source does not equate to the amount of energy that the body will utilize from that source. The body digests foods differently (and each person's body will digest food differently based on your previous eating habits and exercise level, but that is too complex for this discussion).

For instance, insoluble fiber "has" calories but your body will not use any of those calories. Thus, "calories in" has 0 effect on energy use by the body. Similarly, equal "calories" of simple carbs and complex carbs will have different energy effects: simple carbs will use almost no energy to become usable energy while complex carbs require digestion (which uses energy) to become usable energy.

Also, the effects of what you eat will change the physiology of our bodies. Some foods at 100 calories will trigger your body to produce fat while an equivalent amount of calories of a different food source can instruct your body to burn fat.

These are just simple examples which convey the point that calories are not equal and the "laws of metabolic thermodynamics" are a lot more complex than the first law of thermodynamics.