Gaining weight is a lot easier than losing it. Prevention is better than cure, so as soon as you notice that your weight is going up, do something about it. Here's what I do. I weigh myself everyday and if I see an alarming increase, I start eating less. I drink more water and I get myself some green smoothies. Its difficult but I try really hard. And I try to reduce carb and replace bad carb with good ones like sweet potatoses