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Why "Eat Less, Move More" Stops Working After 40

By Susan·7 min read·14 July 2026
A balanced plate of grilled chicken, roasted vegetables and wholegrains

I was doing everything the same as I had in my thirties. Same meals, same portions, same walks. But the weight, especially around my middle, kept creeping up anyway, and for a while I genuinely thought I was losing my mind, or my discipline, or both. Neither was true. The equation itself had changed underneath me.

The new maths behind your metabolism

A few things shift at once here. As oestrogen declines, fat storage tends to redistribute toward the middle of the body rather than the hips and thighs, which is a change in pattern, not just amount. Separately, muscle mass naturally decreases with age if it isn't actively maintained, and muscle is what drives your resting metabolic rate, so less muscle means your body burns less at rest than it used to.

On top of that, blood sugar regulation and cortisol both play a bigger role in weight than they did in your thirties, so the same calorie-counting approach that worked before can quietly stop delivering the same result, not because you're doing less, but because the underlying maths has moved.

Your body isn't broken. It's running on different rules than it used to.

Rather than cutting further, the more useful lever at this stage is usually building, more strength work, enough protein to support muscle rather than just restricting food further. It's not a dramatic overhaul, just a different starting point, and it's the one we walk through in The Hormone Reset Code.

This article is general educational information and personal experience, not medical advice. If weight changes is persistent or worrying you, your doctor is the right person to talk to.

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