Let's finally put an end to the debate of raw vs. cooked.
Of course, in the grand scheme of a well-balanced, nutrient-dense, varied, whole foods diet, the cooked vs. raw debate isn't that critical for most people.
Where this can become a consideration is for vitamin and mineral deficiencies (or "insufficiencies"). these may be due to digestion or absorption issues, or avoidance of certain foods (due to allergies, intolerance's, or choice).
And I'll tell you that the answer isn't as simple as "raw is always better" or "cooked is always better." As with most nutrition science, it depends on several factors. Some vitamins are destroyed in cooking, while others become easier to absorb (a.k.a. more bio-available").
Here is the skinny on vitamins and minerals in raw foods versus cooked foods..
Foods to eat raw:
As a general rule, water soluble nutrients, like vitamin C and the B vitamins, found mostly in fruits and vegetables, are best eaten raw.
The reason why is two-fold.
First, when these nutrients are heated, they tend to degrade; this is from any heat, be it steaming, boiling, roasting, or frying. Vitamin C and the B vitamins are a bit more "delicate" and susceptible to heat than many other nutrients.
Of course, the obvious way to combat these nutrient losses is to eat foods high vitamin C and B vitamins in their raw form (like in an awesome salad) or to cook them for as short a time possible (like quickly steaming or blanching).
Fun fact: Raw spinach can contain three times the amount of vitamin C as cooked spinach.