Guides · By Erik · 30 October 2026

Why am I not losing fat at 40?

You train four times a week, you eat fairly well, and you look the same as two years ago. That is frustrating, and it is rarely about willpower. These are the reasons I see most often.

1. You eat more than you think

Almost everyone underestimates what they eat. Weekend meals, drinks, cooking oil and snacks add up. Track honestly for two weeks, without changing anything, before you decide what to fix.

2. Your training has stopped progressing

Doing the same session at the same weights keeps you fit, but it stops giving your body a reason to change. Strength training with gradual progression protects muscle while you lose fat, and muscle matters more every year after 40.

3. Too little protein

Low protein makes it harder to keep muscle and easier to stay hungry. Most men I coach eat far less than they think.

4. Sleep and stress

Short sleep increases hunger and makes training feel harder. Long days and high stress push most people toward easy food and less movement. This is often the biggest hidden factor.

5. You move less outside the gym

Four hours of training a week is small next to a hundred hours of sitting. A desk job, the car and the sofa can cancel out a lot of good sessions. Daily steps are an underrated tool.

6. Something in your blood work

Blood sugar control, thyroid function, testosterone and iron status can all affect energy and body composition. You will not know without testing. See which blood tests to take after 40. If anything is outside the reference range, talk to your doctor before you change course.

What to do first

1. Get a blood panel, so you know your starting point.
2. Track food honestly for two weeks.
3. Put progression back into your strength training.
4. Protect sleep like you protect training.
5. Measure again after 12 weeks: weight, waist, photos and a retest.

This is the structure of my 12-week plan. See what it did for real clients.