I m feeling week but when i eat non veg i feel better what is in non veg food that is not in veg food, i don't eat non veg on daily basis?

More protein, maybe: Your body needs protein in order to function properly. This is reflected in how you feel day to day. Non vegetarian foods provide meat, fowl, and fish -- which vegetarian foods do not. It's possible to be healthy and feel good as a vegetarian if you eat enough proteins, which could include eggs and dairy items too. Vitamin B12 can be deficient in strict vegan diets.