While it's true that steroids are bound to increase your weight, you can try n arrest increase. You haven't mentioned your medical condition for which u are taking steroids. Diet will depend upon that. For the time being , do following:
1. Stop outside food.
2. Watch your portion sizes.
3. Decrease
sugar, sweets, chocolates and munching items like farsan etc
4. Do some light exercise suitable for your medical condition.
5. Increase fiber in the diet by including oats, barley, apples, methi seeds, chia, vegetables, sprouts.
6. Drink lemon or infused water throughout the day
Next Steps
consult a nutritionist for a holistic diet plan