It's not necessary to be hungry after a workout if you have been loading while doing what ever it is that you do. But I find that after rest the hunger sets in. Eat when your hungry not just because it's dinner time. If you work out so much that you loose your appitite and are overworked or close to heat exaustion then you have another proplem. You need to rehydrate, rest and take on more fuel. I have been to the state of total exaustion and dehydration and had to rest for hours before I could function. Never again...