Sleep, heat and the perimenopause plate

Perimenopause has become a marketplace. Supplements, powders, protocols, and a great deal of confident language about balancing hormones through diet. We want to be straightforward with you about which parts of this have evidence behind them, because the honest list is shorter than the one you are being sold — and, usefully, much cheaper.

What is actually happening

Perimenopause is the stretch of years before periods stop, during which oestrogen and progesterone fluctuate and then decline. It commonly starts in the mid-forties, though it can be earlier, and symptoms can include hot flushes, night sweats, disturbed sleep, low mood and anxiety, brain fog, joint aches and changes to periods.¹

Two consequences matter nutritionally. Falling oestrogen accelerates the loss of bone density. And muscle mass declines with age anyway, faster without resistance work. Both of those are influenced by what you eat, and both are worth protecting now rather than at seventy.

The two things worth real attention

Protein, more than you are probably eating

Muscle isn't about appearance. It is what keeps your metabolism from dropping, keeps you strong and stable on your feet, and keeps blood sugar manageable. Protecting it needs two things together: enough protein, and resistance exercise — lifting something heavy enough to be hard, twice a week. Protein without the exercise does very little, and this is the part the powders never mention.

Most people eat their protein in one lump at dinner. Spreading it across the day — something protein-containing at each meal — is more useful for muscle maintenance. In practice that means breakfast is the meal to change, because breakfast is where UK protein intake is usually lowest: eggs, Greek yoghurt, or oats made with milk rather than water.

Bone: calcium and vitamin D together

UK adults need 700mg of calcium a day, which is roughly three servings of dairy or fortified alternatives — a glass of milk, a pot of yoghurt, a matchbox of cheese.² Non-dairy sources include fortified plant milks (shake the carton; the calcium settles), tinned sardines and salmon with the bones in, tofu set with calcium, and leafy greens such as kale.

Calcium needs vitamin D to be absorbed properly, and in the UK that means 10 micrograms a day of supplemental vitamin D through autumn and winter, year-round for many people.^3,4 If you take one supplement at this stage of life, this is the one.

Hot flushes and sleep: find your own triggers

Alcohol, caffeine and spicy food are the commonly reported dietary triggers for hot flushes, and the NHS lists them among the things worth trying to reduce.⁵ But the response is genuinely individual — plenty of women find spicy food irrelevant and a second glass of wine decisive, or the reverse.

So rather than removing all three on principle, test them. Take one, reduce it properly for two weeks, and pay attention. That way you give up only what is actually costing you something, which is the difference between a change you keep and a change you resent.

On sleep specifically: alcohol is the one most worth testing first. It is very good at getting you to sleep and very bad at keeping you there, and night sweats plus a fragmented second half of the night is a common pairing. Caffeine after about two in the afternoon is the other reliable candidate.

Where the evidence is thinner than the marketing

We would rather tell you this than sell you something.

• Phytoestrogens — soya, flaxseed, red clover. Plant compounds with a weak oestrogen-like action. Trials show modest benefit for hot flushes in some studies and none in others, with real variation between individuals. Worth trying as food (edamame, tofu, tempeh, ground flaxseed) rather than high-dose supplements, and worth discussing with your GP if you have a history of hormone-sensitive breast cancer.
• Black cohosh, evening primrose, wild yam — widely sold, poorly supported, and black cohosh has been associated with rare liver problems. We do not recommend them.
• “Hormone balancing” protocols — there is no diet that restores declining oestrogen. Anything claiming to is either overstating a small effect or describing HRT, which is a medical conversation with your GP, and a good one to have.
• Collagen powders — the evidence for skin is more interesting than it used to be and still modest; for joints and bone it is weak. Not a priority ahead of protein, calcium and vitamin D.

The thing nobody says

A lot of the dietary advice aimed at women in their forties carries an unspoken suggestion that the body is now a problem to be managed. We do not think that, and we notice how tiring it is for the women we work with.

What is happening is ordinary, and most of the useful responses to it are also ordinary: eat enough protein, get some sunlight and take the vitamin D anyway, pick up heavy things twice a week, work out whether the wine is costing you the night, and go and talk to your GP about the symptoms that are actually affecting your life. That is the whole protocol, and there is nothing to buy in it except a bottle of vitamin D.