What diet should one follow if they have high sgpt levels?

Find cause first: You need to determine why is the SGPT level high and address that cause. At a minimum, do not use alcohol at all. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.