My bmi is 16.4, now i am doing regular exercise to increase muscle mass.also i am taking lots of protein rich food.is excess of protein good for health?

Need for evaluation: Have you always been skinny? Did you lose weight due to an illness? Excess protein will not provide any more benefit than normal intake, which should be about 1.0 for each kilogram of weight. If your kidneys are okay, more protein will not do harm. If you are otherwise healthy, do not worry about being skinny.

Eat extra protein: If you are lifting weights your body will require extra protein to produce muscle. Remember, its not excess if you body is using it. There is no great calculation, but i recommend adding a single protein shake a day (about 25g), in addition to making healthier choices with your meals. You don't have to be a freak about it, just conscious about your decisions. That means more higher protein foods.

Dr Bowen agreed

Excess protein: Excess protein is more than 100 grams. It is stressful to kidneys and liver. Stay at one gram per kg body weight. Egg white is superior to all. Quinoa is excellent. Beans and lentils are excellent. Milk protein is excellent. Whole grains are good but not sufficient. Nuts are excellent. Yogurt is excellent

Dr Pizzo agreed