How Fat Loss Really Works

If you want to lose fat, you need to be in a caloric deficit meaning you’re eating fewer calories than your body burns.

You only bring calories in through food.
Your body burns calories all day, whether you move or not.

That’s why you always hear: “Abs are made in the kitchen.”

Calories Out = TDEE

Your total daily energy expenditure (TDEE) is the sum of everything your body does to burn calories:

BMR (Basal Metabolic Rate): The cost of staying alive. Even if you were in a coma, you’d burn calories just keeping your body functioning. This makes up the biggest chunk (60–70%). The more muscle you carry, the higher your BMR.
NEAT (Non-Exercise Activity Thermogenesis): Calories burned through everyday movement like walking, cleaning, fidgeting, or working on your feet. This can vary a lot from person to person (think server vs. desk job).
TEF (Thermic Effect of Food): Calories your body uses just to digest and process food.
EA (Exercise Activity): Calories burned during workouts. Surprisingly, this is the smallest slice of the pie usually 5–10%.

Why Exercise Still Matters

A lot of people try to “out-exercise” their diet, but exercise alone doesn’t create much of a deficit. Its real role is this:

Preserve muscle mass while dieting. Without lifting, weight loss comes from both fat and muscle. Losing muscle lowers your metabolism, making it harder to keep fat off long term.

Metabolic Adaptation & Plateaus

When you cut calories, your body adapts by trying to conserve energy:

Your NEAT drops (you move less without realizing it).
Your metabolism slows down slightly (called metabolic adaptation).

This is why fat loss often stalls after the first few weeks. A simple fix? Set daily step goals to keep your activity consistent and prevent your body from “downshifting” too much.

The Bottom Line

Diet controls your deficit.
Strength training protects your muscle.
Movement (steps/NEAT) prevents plateaus.

Put those three together, and fat loss becomes sustainable.