The challenges of balancing a food plan are increased by trying to eat raw only, and some negative effects of all-raw have been reported. Eating a lot of raw fruits and vegetables is a good choice in any way of eating, but forbidding any and all cooked foods can be counterproductive.
Many fruits, vegetables, nuts and seeds are at their best when they are not cooked, and raw vegan practitioners report good results from their way of eating. However, some very nutritious foods will not be digested if they are not cooked, and some nutrients are actually enhanced by cooking.
This article from Plant Based News summarizes the pros and cons of raw vegan eating plans.