Almost every meaningful change in body weight comes down to energy balance. This guide explains what that means in plain language and how to think about it practically.
What Are Calories?
Calories are a unit of energy. The energy in food and drink, and the energy your body uses, are both measured in calories.
Your body uses energy for everything — keeping you alive, moving, digesting and recovering.
What Is Energy Balance?
Energy balance is the relationship between the energy you take in and the energy you use.
Individual results vary and many factors influence the outcome.
- A surplus tends to lead to weight gain over time
- A deficit tends to lead to weight loss over time
- Maintenance means intake roughly matches expenditure
A Practical Approach
You don't need to obsess over precise numbers. Being broadly aware of intake and focusing on mostly whole, satisfying foods is a sustainable starting point.
Consistency over weeks matters far more than any single day.