The Lila perimenopause hub
Perimenopause, explained
Perimenopause is the transition leading up to menopause — the years when hormone levels start to fluctuate and periods, sleep, mood, energy and weight can all change. It is a normal life stage, and it is also one of the least explained. This hub gathers what is known, what helps, and every Lila guide in one place.
Reviewed by Rebecca Rumsey, MSc, RD · Last reviewed 21 October 2026
The basics
What is perimenopause?
Perimenopause means “around menopause”. It begins when the ovaries start producing less consistent amounts of estrogen and progesterone, and it ends twelve months after your final period — the point called menopause.
For most women it starts in their 40s, but it can begin in the late 30s. The average length is around four years, though for some women it lasts only months and for others eight years or more.
Early perimenopause usually shows up as cycle changes: periods that come closer together or further apart, heavier or lighter than before. Late perimenopause is marked by longer gaps — 60 days or more without a period — and often stronger symptoms such as hot flashes, night sweats and sleep disruption.
Because hormones fluctuate day to day, symptoms can come and go. That unpredictability is itself one of the most common experiences of perimenopause.
Signs & symptoms
More than hot flashes
Changing hormone levels can affect almost every system: cycle changes, hot flashes and night sweats, poor sleep, low mood or anxiety, brain fog, joint pain, dry skin, hair changes and weight gain around the middle. Not everyone gets every symptom, and severity varies enormously from woman to woman.
The 34 symptoms of perimenopause
The full checklist, grouped by domain, with what each symptom can feel like.
Read the guideAm I in perimenopause? Quiz
A 12-question check on your cycle, symptoms and age pattern.
Read the guidePerimenopause stage quiz
Where you are on the STRAW+10 staging scale, from late reproductive to postmenopause.
Read the guideWeight & nutrition
Why your body stops responding to what used to work
Falling estrogen changes where fat is stored — favouring the abdomen — while age-related muscle loss and poorer sleep lower the number of calories you burn. The result: diets that worked at 30 often stall at 45. Nutrition and daily habits built for this stage can still move things.
Perimenopause weight gain
Why weight shifts to the middle in perimenopause and the nutrition levers that help.
Read the guidePerimenopause diet plan
Plate ratios, eat-more and eat-less lists and a sample day, built for this life stage.
Read the guideLose weight in perimenopause plan
Personalised calories, protein and a four-week build-up plan.
Read the guideYour stage & your options
Work out where you are — and what to ask your doctor
There is no single blood test that confirms perimenopause; diagnosis is usually based on age, cycle changes and symptoms. Tracking what you experience over a few months gives you — and your doctor — a much clearer picture.
Perimenopause stage quiz
Where you are on the STRAW+10 staging scale, from late reproductive to postmenopause.
Read the guidePerimenopause vs menopause
The difference between the transition and the point after it, side by side.
Read the guideHow long will my perimenopause last?
A personalised estimate from your age, family history and current stage.
Read the guideDo I need HRT? Quiz
A 12-question readiness check with risk-flag handling, to inform a conversation with your doctor.
Read the guidePerimenopause symptom quiz
The 21-question Greene Climacteric Scale, used in clinical research.
Read the guideSee a doctor promptly if you have very heavy bleeding, bleeding between periods or after sex, or any bleeding after twelve months without a period. Lila is a wellness app and does not diagnose, treat or prescribe.
The data
What Lila members report
The Lila Perimenopause Report (October 2026) analysed self-reported check-ins from 779 members: energy and sleep scores rose by day 90, and 24% of members with weight logs reported losing 5% or more of their starting weight. Observational, self-reported data — not a clinical trial.
Read the member researchThe app
Built for exactly this stage
Lila combines photo meal logging, a 24/7 AI nutrition coach and symptom tracking in one daily experience, with nutrition protocols developed by Rebecca Rumsey, MSc, RD.
Sources
Further reading
- The Menopause Society — Perimenopause 101
- NHS — Perimenopause
- Mayo Clinic — Perimenopause
- SWAN — Study of Women's Health Across the Nation
This page is educational and is not medical advice. Always consult a qualified clinician about your own symptoms and treatment options.