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Gemma Perry

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September 29, 2025

Why Dieting Like You’re 25 Doesn’t Work After 40 (And What Does)

You might have been able to skip meals, smash out some cardio, and drop half a stone in a few weeks back in your 20s.

But now? Same tactics… zero results. In fact, you probably just end up tired, irritable, and frustrated.

Here’s why, and what actually works.

1. Your metabolism and muscle mass have changed

From your 30s onwards, you naturally lose muscle unless you actively work to keep it. Less muscle means a slower metabolism, so the “eat less, move more” plan hits harder.

What works now:

  • Eat enough to fuel your body (not starve it).

  • Strength train at least twice a week.

  • Get 25–30g protein at every meal.

2. Your hormones aren’t the same

Perimenopause brings fluctuations in oestrogen and progesterone that affect sleep, mood, appetite, and where you store fat (hello, belly).

What works now:

  • Balance your meals to avoid big blood sugar swings.

  • Reduce alcohol - it impacts sleep, recovery, and belly fat storage.

  • Prioritise rest and recovery just as much as workouts.

3. Stress hits differently

Back then, you could run on coffee and willpower. Now, high stress + low food = hormonal chaos. Cortisol (your stress hormone) can make fat loss much harder when it’s constantly elevated.

What works now:

  • Keep meals regular and balanced.

  • Add stress management that actually works for you — walking, stretching, reading, even 10 minutes of quiet.

  • Avoid punishing exercise when you’re already burned out.


You don’t need to diet harder. You need to fuel better, train smarter, and rest more strategically.

When you do, your body will respond, without feeling like you’re constantly fighting it.

If you’re done with the “eat as little as possible” approach and want a plan designed for your body right now, let’s work together.

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