STAGE 1 OF 3

Perimenopause: The Beginning of the Transition

This is the phase most people actually mean when they say "menopause." Hormone levels start swinging unpredictably, periods change, and the first symptoms show up — often years before anyone officially calls it menopause.

What's Happening

Perimenopause begins when your ovaries start producing oestrogen and progesterone less predictably — not a steady decline, but an erratic pattern of highs and lows. This hormonal turbulence, rather than a smooth drop, is what causes most perimenopausal symptoms.

It typically starts in your 40s, though some women notice changes in their late 30s. There’s no single test that confirms perimenopause. It’s usually identified by your age and pattern of symptoms, most often changes to your periods.

How Long It Lasts

12 months

without a period marks the end of Perimenopause. You’re now moving into menopause

4–10+ years

Typical length of perimenopause

Last 1–2 years

This is usually when symptoms are most intense

Common Symptoms at this Stage

Hot Flushes & Night Sweats

Sudden waves of heat, often with a racing heart, day or night . Driven by the brain's temperature centre reacting to shifting oestrogen.

Sleep Disruption

Trouble falling or staying asleep, sometimes tied to night sweats. Poor sleep then makes every other symptom feel worse.

Mood Changes & Irritability

A shorter fuse or waves of anxiety that feel out of character. Hormone shifts affect brain chemistry directly.

Brain Fog

Trouble concentrating or misplaced words. Usually temporary, and one of the most under-discussed symptoms.

Irregular Periods

Often the first sign — cycles may shorten, lengthen, or skip.

Changes in Fertility

You can still get pregnant — fertility declines but doesn't disappear.

Food and menopause are connected

Falling and fluctuating oestrogen affects far more than your cycle — it influences bone density, insulin sensitivity, inflammation, and even neurotransmitter activity in the brain. That’s why targeted nutrition can meaningfully ease symptoms like hot flashes, brain fog, joint pain, and sleep disruption, alongside protecting long-term bone and heart health.

Nutrition for Perimenopause

Hormones are fluctuating here, not yet consistently low, so nutrition at this stage is about smoothing the swings day to day, easing the symptoms that show up first, and starting to build reserves for what’s ahead.

HELPS WITH: HOT FLASHES, NIGHT SWEATS.

Phytoestrogens (Soy, Specifically)

The best-evidenced nutrient here for hot flushes and night sweats — soy isoflavones are linked to real reductions in frequency and severity. This is soy-specific: flaxseed trials for hot flushes came back null, even though flaxseed is good for other things.

Roasted soy nuts, natto, tofu, tempeh, soy milk, edamame. ~50–100mg isoflavones/day.

HELPS WITH: POOR SLEEP, BONE RESERVES

Calcium & Vitamin D

Better-evidenced for sleep quality than magnesium alone. Oestrogen still offers some bone protection here, so this is also the window to build reserves before the bigger drop after menopause.

Dairy or fortified plant milks, leafy greens, oily fish, sensible sun or a supplement.

HELPS WITH: ANXIETY, MOOD SWINGS, SLEEP

Magnesium

One of the more consistently-evidenced nutrients for how erratic perimenopause can feel — real trial support for anxiety and low mood, with a smaller but genuine trial base for sleep.

Pumpkin seeds, Brazil nuts, almonds, spinach, dark chocolate.

HELPS WITH: BRAIN FOG, MEMORY, LOW MOOD

Omega-3 (“Brain Food”)

DHA is the brain’s primary structural fat, and omega-3s have real, if moderate, trial support for both cognitive symptoms and mood through the transition.

Oily fish, walnuts, chia seeds, ground flaxseed.

HELPS WITH: LOW ENERGY, FATIGUE

Iron & B Vitamins — Especially If You’re Actually Low

Deficiency can genuinely worsen fatigue, and this is the phase it’s most likely to matter, since periods are still happening. But it only helps if you’re actually deficient — worth a GP blood test rather than guessing. Folate matters doubly here, since fertility hasn’t fully declined.

Lean red meat, lentils, leafy greens, fortified cereals, eggs.

Food doesn’t replace medical treatment where symptoms are significant — think of it as the foundation everything else sits on top of.

For the full list of foods containing these nutrients, download the MenoMap app

see details below

When to See Your GP

Periods less than 21 days apart, or lasting longer than 7 days
Heavy bleeding, bleeding between periods, or bleeding after sex
Symptoms significantly affecting daily life, work, or relationships
Any new or worsening symptoms you’re unsure about

This isn’t a diagnostic checklist — it’s a prompt to have a conversation, not a reason to worry alone.

What the Research Says

NICE guidance confirms hormone blood tests usually aren’t needed to diagnose perimenopause in women over 45 with typical symptoms.

Irregular bleeding is expected, but new heavy bleeding, bleeding between periods, or bleeding after sex should always be checked by a GP.

Regular exercise and consistent sleep routines are among the best-evidenced non-hormonal ways to ease symptoms.

Both HRT and non-hormonal medications are effective options — what suits one woman may not suit another.

This page offers general information, not personal medical advice — please speak to your GP or a menopause specialist about your own symptoms and options.

Evidence-based nutrition guidance for Perimenopause, Menopause, and Postmenopause

Log what you eat and how you feel and see the connection between the two in your own data, not just averages
Personalised to your top 3 symptoms, your phase, and your goals
A full MenoKitchen food database, plus a protein tracker built for menopause
Everything stays private on your phone. Nothing is ever sent to a server

Want early access? Get in touch using the button below and we’ll let you know the moment MenoMap launches.

The phase most people actually mean when they say “menopause.”