Hello Thank you for trusting HCM Dear Your taking fat burner so it may useful to break down of fats by increase metabolism. If your not taking suffient amount of calories per day lead to excessive hunger and tendency to eat food. So calculate calories depending upon your body weight and consume. a indian adult male require 2500kcal/day. so calculate your self just maintain stomach filling and calories deficit food. It may useful for healthy weight loss. Don t intake excessive caffeine 300 mg /day it cause excessive hungryness. if your getting head ache decrese the amount of consumption of product and see. If not relieved please consult your doctor he will examine and treat you accordingly. Take care