Beliefs held by raw foodists may include: 1  That heating food above 104-118 °Fahrenheit (40-49 °C) starts to degrade and destroy the enzymes in raw food that aid digestion. 2  A few raw foodists such as Douglas Graham dispute the importance of enzymes in foods.aw foods included on such diets have not been heated above 40 °C (104 °F). Raw animal foodists believe that foods cooked above this temperature have lost a lot of their nutritional value and are less bioavailable.