http://www.scientificamerican.com/ar...-are-healthier
Comparing the healthfulness of raw and cooked food is complicated, and there are still many mysteries surrounding how the different molecules in plants interact with the human body. The bottom line is to eat your veggies and fruits no matter how they're prepared.
Fact or Fiction: Raw veggies are healthier than cooked ones
Do vegetables lose their nutritional value when heated?
Obviously many food cannot be eaten raw. IMO cooked in general is beneficial.