When people first start any kind of physical exercise, yoga, karate, acrobat.... they want to know how they can optimize their ability and I usually say, "Good diet and good mindset".
Try taking at least 80- 120 grams of Organic Brown rice and 300- 400 grams of raw vegetables per day. One of the simple menu suggest to yoga starters are to avoid all "whites" in their foods such as bleached wheat, refined sugar and white rice. Out of all vegetables, organic cabbage and carrots are the best for helping your digestive enzymes. Since most cooked foods stay in our system anywhere from 3 days to 1 week, it is crucial to eat mindfully (meaning less). Chew the food 30-40 times and eat when you are not rushed. Because of the warm environment in our tummy, the food will rot easily releasing toxins thru our system. So eating enzyme rich foods such as cabbages will help move the waste materials smoothly. Thinly slice them and add a pinch of salt (sea salt) to the raw vegetables so it enhances the natural flavor. This will also make the texture of the veggie easier to chew.
No need to jump straight into all raw food- start by 50% raw per meal and increase them by how you feel. Drink warm water instead of cold- this will help your body work less thus sustains energy (unless you live in hot country- even so, my father always insisted I drink warm tea during summer).
No need to have this diet all the time once your body gets the proper function back. You will be able to properly digest all sorts of things! Even "mental" things.