Blood sugar and insulin sensitivity in perimenopause

Q: Which foods help with blood sugar in perimenopause?

Low GI carbs like lentils, beans, peas, steel-cut oats and potatoes give you a steadier release of energy and help smooth out sharp spikes. Pairing your carbs with some protein, like lean meat, fish, eggs, beans, or tofu, slows glucose absorption further. High-fibre foods, including wholegrains, fruit, vegetables, and nuts, also slow sugar absorption and help keep your blood glucose steadier.

Q: How much fibre should you aim for to support blood sugar?

UK guidelines suggest 30g of fibre a day. You will find it in wholegrains, fruit, vegetables, beans, lentils, and nuts. Reaching 30g most days takes a bit of planning, so keeping the skin on your vegetables, choosing wholegrain versions of staple foods, and adding a portion of beans or lentils to your meals can all help.

Q: What should you do if you have diabetes and are going through perimenopause?

Perimenopause can make diabetes harder to manage, because the hormone fluctuations that happen through perimenopause, can reduce insulin sensitivity further, particularly alongside changes in abdominal fat, muscle mass, sleep and activity. All of which can make blood sugar regulation less efficient over time. A hot flush can also sometimes feel like a hypo, or low blood sugar. It is worth speaking to your GP or diabetes care team about how to adapt your management during this stage. Do not change your medication or how often you monitor without talking it through with your healthcare team first.

Q: Does meal timing matter for blood sugar during perimenopause?

Spreading your carbs across your meals, rather than loading them into one sitting, helps you avoid a big blood sugar hit all at once. Your insulin sensitivity tends to be higher earlier in the day, which points to the value of a protein-rich breakfast and a more even spread of carbs. This research is still developing, so it is best held as one consideration alongside the broader food strategies here.

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The mid-afternoon energy crash, the craving that arrives out of nowhere, the dip that makes concentration feel impossible. These can all turn up more often during perimenopause. And your blood sugar balance may be part of the picture which is why what you eat, and how you put your meals together across the day, is often where managing it begins.⁹

Why falling oestrogen affects blood sugar

The energy, mood, and appetite shifts you may be noticing are partly due to changes in your blood sugar. Insulin is the hormone that helps move glucose (sugar) out of your bloodstream and into your cells, where it can be used for energy. Oestrogen helps influence how your body responds to insulin and handles glucose. As hormone patterns fluctuate through perimenopause, some women may become less sensitive to insulin, particularly alongside changes in abdominal fat, muscle mass, sleep and activity. This can make blood sugar regulation less efficient over time.¹²

Choosing carbs that release energy slowly

Some carbs raise your blood glucose quickly, others release it more slowly. The glycaemic index (GI) ranks them by how fast they do this. Lower GI choices, like Lentils, beans, peas, steel-cut oats and potatoes, give you a slower, steadier release of energy and help smooth out sharp spikes. In practice, other examples might be swapping white bread for wholegrain, choosing steel-cut porridge oats over processed cereals, and building meals around beans and lentils where you can.³

Building a balanced plate

If you find it hard to know how much of each thing to put on your plate, a simple plate model can help. Aim for half your plate as fruit and non-starchy vegetables, a quarter as protein, and a quarter as carbohydrates. This keeps your carbohydrate portions in check without cutting them out, and gives you a visual guide you can use at any meal, with no calorie counting.¹⁰

Protein at every meal

Adding some protein to each meal, whether that is lean meat, fish, eggs, beans, or tofu can help to keep your blood sugar steadier after a carbohydrate-containing meal. Protein also tends to make meals more filling, which may help you stay satisfied for longer and make later hunger or cravings easier to manage.⁴

How fibre steadies your blood sugar

Fibre helps slows how fast sugar moves from your food into your bloodstream. UK guidelines suggest aiming for 30g of fibre a day. You will find it in wholegrains, fruit, vegetables, beans, and nuts. Reaching 30g most days takes a bit of effort, so adding a portion of pulses to a meal, keeping the skin on your vegetables, and choosing wholegrain bread and pasta all add up.⁵¹¹

When you eat across the day

Your body generally handles glucose more effectively earlier in the day than it does later on. This supports starting the day with a balanced, protein-rich breakfast and avoiding saving most of your carbohydrate intake for one large evening meal. Spreading carbohydrate-containing foods across your meals may also make them easier to manage.⁶⁷

If you have diabetes

If you are already managing diabetes, perimenopause can make your blood sugar harder to keep on track. Fluctuations in hormones during perimenopause can cause your body to become less responsive to insulin, meaning that you may experience sudden changes in your blood sugar. It is worth speaking to your GP or diabetes care team before you make big changes to your diet, and asking whether your monitoring schedule needs a review during this stage.¹²

If you have PMOS (formerly known as PCOS)

If insulin resistance is already part of your PMOS, the metabolic changes that can accompany perimenopause can add to it. The mix of falling oestrogen and relatively higher androgens may make blood sugar regulation more difficult and increase your risk of developing type 2 diabetes. The food strategies in this article, especially low GI carbs, steady protein, and plenty of fibre, are particularly worth your attention. If you are worried about how perimenopause is affecting your metabolic health, raise it with your GP or healthcare team.⁸¹³

If you want personalised guidance on adjusting your diet during perimenopause, especially if you have diabetes or PMOS, you can ask your GP for a referral to a registered dietitian.

Frequently Asked Questions

Why does perimenopause affect blood sugar?

Which foods help with blood sugar in perimenopause?

How much fibre should you aim for to support blood sugar?

What should you do if you have diabetes and are going through perimenopause?

Does meal timing matter for blood sugar during perimenopause?

Sources

[1] Effect of oestrogen plus progestin on the incidence of diabetes in postmenopausal women: results from the Women's Health Initiative Hormone Trial

Oestrogen plays a key role in glucose homeostasis and insulin sensitivity, and that declining or fluctuating oestrogen levels during perimenopause contribute to decreased insulin sensitivity
[2] Cellular mechanism by which estradiol protects female ovariectomized mice from high-fat diet-induced hepatic and muscle insulin resistance

Perimenopausal hormonal changes, alongside shifts in abdominal adiposity, lean muscle mass loss, poor sleep quality, and reduced physical activity, impair blood sugar regulation over time
[3] Glycaemic index and diabetes

Choosing low GI carbohydrates like wholegrain bread, brown rice, oats, and pulses helps to prevent sharp blood sugar spikes by providing a slower, more stable release of energy.
[4] A randomized, controlled, crossover trial to assess the acute appetitive and metabolic effects of sausage and egg-based convenience breakfast meals in overweight premenopausal women

Including a source of protein like lean meat, fish, eggs, beans, or tofu in every meal helps increase satiety and slows the absorption of glucose from carbohydrates, promoting stable blood sugar levels.
[5] BDA Food Fact Sheet: Fibre

UK guidelines suggest aiming for 30g of fibre a day
[6] The effect of diurnal distribution of carbohydrates and fat on glycaemic control in humans: a randomized controlled trial

Emerging research in chrononutrition suggests meal timing is important, as insulin sensitivity is naturally higher in the morning
[7] Diurnal Pattern to Insulin Secretion and Insulin Action in Healthy Individuals

Some experts recommend a protein-rich breakfast and consuming most carbohydrates with the evening meal.
[8] Polycystic ovary syndrome is a risk factor for diabetes and prediabetes in middle-aged but not elderly women: a long-term population-based follow-up study

For women with PCOS who often already have insulin resistance, perimenopause can worsen the condition. The combination of declining oestrogen and high androgens may increase the risk of type 2 diabetes.
[9] Symptoms of menopause and perimenopause

Your blood sugar balance may be part of the picture which is why what you eat, and how you put your meals together across the day, is often where managing it begins
[10] Menopause Nutrition and Weight Gain

A plate model: half the plate should be fruit and vegetables, a quarter protein, and a quarter carbohydrates.
[11] Nutrition for menopause

A high-fibre diet is crucial for blood sugar control, as fibre slows sugar absorption. UK guidelines recommend aiming for 30g of fibre per day from sources like wholegrains, fruits, vegetables, beans, and nuts.
[12] Menopause and diabetes

For women with diabetes, perimenopause makes blood sugar management more difficult due to hormone fluctuations and reduced insulin sensitivity. Symptoms like hot flushes can also be mistaken for hypoglycaemia.
[13] NHS: Polycystic ovary syndrome (PCOS)

For women with PCOS who often already have insulin resistance, perimenopause can worsen the condition. The combination of declining oestrogen and high androgens may increase the risk of type 2 diabetes.