The Real Reason You’re Gaining Weight in Perimenopause (and What to Do About It)

If you’ve hit your 40s and suddenly found that the things that used to work just… don’t anymore — you’re not imagining it. The creeping weight gain, the sluggishness, the “why does my body feel different?” frustration — it’s all real.

And while hormones play a role, they’re not the villain. They’re part of a bigger picture that you can absolutely take control of.

Let’s break down what’s really going on — and what actually works to feel strong, capable, and confident again.

First, what’s happening in your body

Perimenopause is the transition phase before menopause, when oestrogen and progesterone start to fluctuate (sometimes wildly). These hormones affect:

• Where your body stores fat — especially around your abdomen.

• How your muscles respond to exercise and recovery.

• Your energy, mood, and sleep quality.

At the same time, you naturally start to lose muscle mass (called sarcopenia) from your 30s onwards — and less muscle means a slower metabolism. Add in a busy lifestyle, disrupted sleep, and maybe a few more “life stressors”, and your body’s stress hormone cortisol can creep up too — further influencing fat storage and cravings.

It’s not that your body is broken. It’s just adapting — and it needs you to adapt with it.

Why traditional “eat less, move more” doesn’t work anymore

Most women in their 40s double down on what used to work — more cardio, less food, or random high-intensity workouts — and end up feeling worse.

Here’s why that backfires:

• Over-restricting calories can cause muscle loss and make your metabolism slower.

• Too much cardio and not enough recovery can elevate cortisol.

• Lack of resistance training means you’re not building the muscle your metabolism needs.

So even though you’re working harder, your body feels stuck in survival mode.

The good news: strength training changes everything

Building muscle is the most effective, evidence-based way to support your body through perimenopause.

Strength training helps by:

• Increasing muscle mass — which boosts your resting metabolism.

• Improving bone density and joint stability.

• Supporting posture, mobility, and daily movement.

• Reducing stress, anxiety, and mood swings.

You don’t have to train for hours or lift like a powerlifter. You just need consistent, progressive strength work (two to three times a week) and a focus on fuelling your body, not depriving it.

What about food?

Food is fuel — and during perimenopause, your body becomes more sensitive to how much and what kind of fuel you give it.

Focus on:
Protein at every meal (it supports muscle, hormones, and satiety)
Whole foods over processed options (for energy and blood sugar balance)
Regular meals (to manage cortisol and energy levels)
Enough total calories to support training and recovery

Ditch the fad diets — your body needs nourishment, not punishment.

Don’t forget recovery

Recovery isn’t lazy. It’s essential.
Sleep, stress management, hydration, and gentle movement (like walking or mobility work) all support your hormonal balance and help your body actually use the benefits of training.

So what should you do next?

If you’ve been feeling frustrated or stuck, start small.

• Add two strength sessions a week.

• Make sure you’re eating enough protein.

• Prioritise 7–8 hours of sleep.

• Take walking breaks through your day.

You don’t need to overhaul your life overnight — you just need a plan that fits your reality.

And if you’d like help figuring out what that looks like for you, that’s exactly what I do with my online coaching clients — helping women in perimenopause build strength, confidence, and momentum again.

Ready to start feeling like yourself again — but stronger?

The Spark Program is a step by step guide that takes you from feeling stuck and overwhelmed to confident and strong. 12 weeks of workouts, perimenopause education, personal coaching support & more.