You indulge in a diet of fast food, luscious desserts, alcoholic beverages, and sweet sodas, you gain weight. You eat more calories than you actually burn, you gain weight. Weight gain is a simple science. You decide to live a healthy lifestyle , to exercise regularly and to control your calorie intake. But you still gain weight. It can be maddening especially when you think you’re doing everything right, following a strict regimen that’s been proclaimed fool-proof by many. Basic science is telling you should be shedding the pounds, but your weighing scale is saying just the opposite. Almost any magazine you open has an article or two about the “10 Simple Steps to a Leaner Body!” or the “Five Easy Ways to Trim your Waist!” Simple and easy sell. Weight gain is a simple science, for some. For others, it can be a lot more complicated. If you are watching your calories and being physically active but are still gaining weight, it can be the result of a combination of factors working together. Here are some of the reasons why the arrow on your scale won’t stop going up