What Is a Calorie Deficit and Why It Matters Understanding Calories In vs Calories Out At its core, a calorie deficit is one of the simplest yet most misunderstood concepts in weight loss. Think of your body like a bank account. Every calorie you eat is a deposit, and every calorie you burn is a withdrawal. When your withdrawals exceed your deposits, your body turns to stored energy—fat—for fuel. That’s the foundation of fat loss. But here’s where things get interesting. Not all calories behave the same way in your body. Sure, 500 calories from a burger and 500 calories from whole foods are technically equal in energy, but they affect hunger, metabolism, and hormones very differently. That’s why people following the Fat to Fit 360 approach often focus not just on quantity but also on quality. Your Total Daily Energy Expenditure (TDEE) plays a big role here. It includes your basal metabolic rate (what your body burns at rest), physical activity, and even digestion. Once you unders...
Fat to Fit in 360 Days.