Cooking can break down some amino acids, and can denature (or change the structure) of some proteins, but it's not a big deal - it doesn't destroy the protein.
It's no different than with most foods that are cooked. You lose some nutrients, but that doesn't mean you need to eat everything raw.
The only way for cooking to "kill" (destroy completely) proteins, fats, and carbohydrates would be to burn the food to the point of inedibility. If you can eat it, most (virtually all) of the protein is still going to be there.
Last edited by kaplods; 12-22-2010 at 02:55 PM.
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