I'm 28 and no cholesterol. but have fatty liver and sgpt sgot both high. what will be the reason?

Need more info: How much do you weigh? Do you drink alcohol? Are you diabetic? No cholesterol is unlikely to be correct. If you drink alcohol, quit entirely, If you are even slightly overweight, lose weight and if you are diabetic, keep blood sugar under control. The issue you described warrants evaluation by a doctor. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. 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, if you have sex.

Fatty liver.: Those with a fatty liver should generally limit fat intake, limit alcohol intake and lose weight (if there's weight to lose) via proper diet and regular exercise. That being said, it would be OK to treat yourself to a fatty meal every once in a while, meaning once a week or two. Realize that all meals will have some fat in them, so it's not like you're completely avoiding fat otherwise.