If you’ve ever wondered why some people seem to eat anything and stay the same weight, while others struggle to lose a few pounds, the answer often comes down to calories. A calorie is simply a unit of energy your body uses to move, think, and live. Eating more calories than your body uses leads to weight gain; eating fewer can help you lose weight. Counting calories doesn’t have to be complicated or stressful. It’s just a way to understand what you’re eating, make smarter choices, and stay in control of your health. This guide will walk you step by step, with simple tips, tricks, and tools that beginners can use right away.