I am a pure Indian vegetarian. I weight nearly 89kgs. I have low appetite but even the minimum I eat is more of junk food (Cheese toast etc.) I have pizza, pastas once a month at the max. I drink nearly 3-4 litres water a day excluding my cups of green tea and freshly squeezed fruit juices. I feel full and make sure I never starve. Along with all this, I am recently working out, it's stressful since I'm on the heavier side but no complaints to working out, I actually enjoy it. Unfortunately the minute I consume even a small quantity of junk, I feel heavy and my weight goes up instantly. Is there something I'm missing in my diet or my lifestyle? Why is that a small quantity of junk makes all my efforts useless? Please advice.