Macronutrients
Macronutrients are protein, fat, and carbohydrates. Every calorie you eat comes from one of these three, and each one affects hunger, energy, and scale behavior differently.
Each macronutrient plays a different role in how your body responds to food. Protein supports fullness and helps maintain muscle. Carbohydrates affect energy levels and water balance. Fat contributes a large amount of calories in small portions, so it needs to be managed carefully.
Related Topics
Calorie Deficit
A calorie deficit is the basic condition for fat loss. This page covers what it really means, why the math is the easy part, and what actually makes it hard to maintain.
Low-Carbohydrate Diet
How a low-carbohydrate diet can support weight loss when used correctly — without strict keto rules. What changes, what to watch for, and where it fits inside a deficit.
Related glossary terms
Caloric Deficit
A caloric deficit means your body uses more energy than you consume. This is the condition required for fat loss over time.
Carbohydrates
Carbohydrates are a macronutrient used by the body as a primary source of quick energy.
Fat
Fat is a macronutrient that provides a concentrated source of energy at 9 calories per gram.
Fat Oxidation
Fat oxidation is the process of breaking down fat to produce energy.
Glycogen
Glycogen is stored carbohydrate found in muscles and liver that the body uses for energy.
Glycogen Depletion
Glycogen depletion is the process of using up stored carbohydrates in the body.
Glycogen Refill
Restoring carbohydrate stores after eating.
Insulin Response
The body's hormonal reaction to food intake, affecting storage and water balance.