[majewsky]

> It's like saying that not every kilogram is the same.

Would you consider a kilogram of gold "the same as" a kilogram of air?

Caloric content refers to the amount of energy released when you literally burn the food in question. But our bodies do not literally burn food. They metabolize it in a sophisticated chemical process that converts said energy into a form that the body can use to do work. The rate and effectiveness of this metabolism is clearly influenced by the type and composition of food. For more information, enter "glycemic index" into your favorite source of knowledge to learn why this measure is important for how food is processed. Just as a small glimpse into the complexity of the metabolism.

[masonic]

  Would you consider a kilogram of gold "the same as" a kilogram of air?

More relevant would be, "is a kilogram of fat the same as a kilogram of muscle?"