Does eating a box of Wheat Thins a day make you gain weight?

Yes it does. A full box of wheat thins equals alot of calories which equals weight gain. Unless that is the only thing you are eating all day. Make the calories you eat equal the calories you burn everyday and you will remain the same weight. No particular food causes weight gain, it's just when you eat too much of it, it means you are probably eating more calories then you are burning that day!