Originally Posted by dealt_with
Absolute nonsense, weight gain or loss is simply energy in versus energy out. Your body maintains homeostasis very well. All food is energy, 17kj from each gram of protein and carbohydrate and 38kj from each gram of fat. You've been reading some shit on the internet, speak to a nutritionist instead. You can lose weight just eating carbs if you really want.
That's not correct.
Weight loss is dependent not only on the amount of calories ingested but their source, i.e. whether they are primarily from carbs, protein or fat.
You would lose varying amounts of weight if on week you were on a 1,000 calorie per day diet that derived 90% of its energy from carbs, the following week 90% from protein and the following week 90% from fat. You're claiming that you would lose the same amount of weight if total calories were the same irrespective of the source. That's simply not true.