Why Am I Gaining Weight Even Though I Exercise?

Glycogen or sugar that your muscle cells convert to glucose is the energy source for your muscles. When you exercise regularly, your body stores more glycogen to fuel that exercise. Stored in water, glycogen has to bind with water as part of the process to fuel the muscle. That water adds a small amount of weight, too.

Why am I gaining weight when I'm eating less and working out?

A calorie deficit means that you consume fewer calories from food and drink than your body uses to keep you alive and active. This makes sense because it's a fundamental law of thermodynamics: If we add more energy than we expend, we gain weight. If we add less energy than we expend, we lose weight.

Is it normal to gain weight before losing?

You'd think that going on a strict diet and exercise regimen would help you drop pounds quickly, but most people actually gain weight at first. If this has happened to you, don't give up on your goals just yet.