The man who insists that he has to have meat for working strength judges by how he feels after a meal and not by the scientific facts.

While in the long run appetite serves as a measure of food requirement, we can find plenty of instances where it does not make a perfect measure.

Some people have too large appetites for their body needs and get too fat from sheer surplus of fuel stored in the body for future needs as fat.

If such people have three good meals a day all the time, there never is any future need and the fat stays.

Other people have too small appetites for their needs and they never seem to get a surplus of fuel on hand.