The key to what happens in the body when you eat a lot of carbs lies in the body's own hormones. Insulin is one of the body's primary anabolic hormones and some will say it's the most powerful – yes, even more, powerful than testosterone. That may be, but insulin is like a double-edged sword – it can cut both ways. Despite its anabolic power, eat too many carbs throughout the day, especially simple carbs, and the result will be insulin spikes - which means fat gain. That's not the scenario we want!