There is a major debate in nutritional circles as to the benefits of raw against cooked vegetables and greens. However, there is no simple answer. It all depends on our personal health objectives and the nutrients we require.
Certain vitamins and nutrients that are water-soluble (i.e. that dissolve in water), like Vitamin B, Vitamin C and some minerals, lose nutrient values when cooked. The method and time of cooking also affects the quantum of nutrient loss.