Many people eat out or bring something home from the market that is already cooked. Even if you prepare your meals at home, most of your food is probably cooked, not raw. Here’s the problem: the more you cook a food, the less its nutrient value.
Of course, there are some foods, such as grains and dried legumes that you have to cook because they’re inedible when raw. You’re obviously not going to eat a bowl of raw rice. However, if you overcook rice, you lose nutrients.