Heavy Periods After 40: The Metabolic Link Nobody Talks About

Many women are told heavy periods in their 40s are simply “hormones.”

But that explanation misses something important.

Emerging research suggests that metabolic health—particularly insulin regulation—may also play a role in abnormal uterine bleeding.

A study published in Menopause (the journal of The Menopause Society) found that elevated insulin levels were significantly associated with abnormal uterine bleeding, suggesting metabolic dysfunction may contribute to cycle disruption. 

In other words, the uterus doesn’t exist in isolation.
It responds to the metabolic signals circulating in the body.

What I See in Practice

In my work with women over 40, the pattern often looks like this:

It’s not laziness or lack of discipline.

It’s metabolic instability.

When blood sugar swings up and down, insulin rises and falls sharply. Over time, this affects hormone signalling, inflammation, and the way the body regulates the menstrual cycle.

The Missing Piece: Strength

The most effective exercise intervention I’ve seen for stabilising blood sugar in midlife women is progressive strength training.

Muscle tissue acts like a glucose sponge.
The more muscle you have and the more often you use it, the more efficiently your body handles blood sugar.

When women begin structured strength work:

One of the best exercises to start with

The Sit-to-Stand Squat

It sounds simple, but it’s incredibly effective.

Why it works:

Try this:

• Sit on a chair
• Stand up slowly without using your hands
• Sit back down with control

Start with 8–10 repetitions, repeat 2–3 times.

Done consistently, this movement alone can begin improving metabolic stability. To add resistance hold something of weight like a bottle of water, a tin of beans or even a handbag. Anything of weight that is easily held in your hands or arms will be sufficient resistance.

A Small Habit That Changes Blood Sugar

If there’s one nutritional habit that makes a huge difference, it’s this:

Eat protein at breakfast.

Many women start the day with toast, cereal, or fruit.

That can spike blood sugar quickly and lead to an energy crash by mid-morning.

Adding 20–30g of protein in the morning (eggs, yoghurt, protein smoothie, cottage cheese) slows glucose release and reduces insulin spikes. Eggs are a great source of all the amino acids the body realties. Where a protein shake can achieve more protein in a meal than a portion of meat/fish.

Another simple trick:

Walk for 10 minutes after meals.

Post-meal walking helps muscles absorb glucose, reducing blood sugar spikes and supporting metabolic stability.

Why Women Over 40 Can Become Magnesium Deficient

Many women become gradually depleted in magnesium during midlife, often without realising it.

Several factors contribute to this. Hormonal fluctuations during perimenopause can increase the body’s demand for magnesium, while chronic stress, busy lifestyles, and disrupted sleep use up magnesium more quickly. At the same time, modern diets often contain fewer magnesium-rich foods than they once did.

Caffeine, alcohol, certain medications, and long periods of physical or emotional stress can also reduce magnesium levels.

Because magnesium plays an important role in muscle relaxation, nervous system balance, blood sugar regulation and inflammation control, low levels can leave women feeling more fatigued, tense, and sensitive to hormonal changes. For some women, this may contribute to symptoms such as increased cramping, heavier periods, poor sleep, and heightened stress responses.

Supporting magnesium intake through whole foods — and when appropriate, a good quality supplement — can help restore a more stable foundation for hormonal health.

The Bigger Picture

Heavy periods are rarely just about hormones.

They are often connected to:

When we address those foundations, the body often responds.

Want Support With This?

In March classes, we’re focusing on structured strength work designed specifically for women in midlife.

If you want to learn how to train in a way that supports your hormones rather than fighting them, come and join us.

And in April, I’ll be running an Honest Body Retreat with will give you more focus on you.

The Honest Body Retreat

A small 5-woman coaching retreat where we map your individual movement and metabolic plan.

We’ll look at:

Just 5 places available.

More details coming soon. If you’d like to know more please complete the website form here and I will send you more information on what its all about and what you get.

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