As long as you eat clean, especially after your slin dose, you shouldnt gain any fat. M. Sarcev once said it matters what you eat in the hours after taking the slin. If you eat zero fat, or as cose to zero as you can get, you should not be gaining any fat. If you are, something isnt right. Experiment with it. Try eating super clean for a period of time (2 or 3 wks) while using slin, and watch the results. I'm gona guess your eating something thats fattening that your overlooking. Good luck.