Perimenopause, Menopause and Weight Gain: What’s Really Going On

What this article covers

This is a Health Articles piece bylined Kate Michelson and dated 14 July 2026. The on-page headline reads Perimenopause, Menopause and Weight Gain: What's Really Going On, which differs from the URL slug. It distinguishes perimenopause from menopause, explains why body composition changes accelerate during the transition rather than after it, sets out the metabolic role of oestrogen, addresses menopausal hormone therapy and vitamin D dosing directly, and gives four practical levers. Its central claims are that midlife weight gain is a predictable metabolic shift rather than a willpower failure, that the fastest metabolic change happens before periods stop, and that protein and resistance training are the highest-value interventions. The author describes herself in the article as a dietitian, exercise physiologist and diabetes educator.

Key points

• Perimenopause is said to usually start in the mid forties, sometimes the mid thirties, and commonly to last four to eight years. Menopause is defined as twelve months after the final period.
• In perimenopause oestrogen fluctuates rather than declining smoothly, and the article states these swings, not the eventual low, drive the most disruptive symptoms.
• Body composition changes accelerate during the transition, with fat mass rising and lean muscle declining, before stabilising after menopause.
• Mechanism given: oestrogen keeps cells sensitive to insulin and favours fat storage on hips and thighs; as it becomes erratic and then low, fat redistributes to the abdomen as visceral fat, insulin resistance worsens, and basal metabolism slows beyond what ageing alone explains. Progesterone and testosterone also decline.
• Stated figure: women gain on average around 2 to 2.5 kilograms across the transition, concentrated in the abdomen.
• Hormone therapy: for most healthy symptomatic women under 60, or within ten years of their final period and without specific contraindications, benefits are said to outweigh risks, and it is described as the most effective treatment for hot flashes and night sweats. Transdermal patches and lower doses are said to further reduce clot and stroke risk.
• Vitamin D: the article warns explicitly against taking 20,000 IU daily, states the upper limit for ongoing adult supplementation is around 4,000 IU per day, and notes excess vitamin D is toxic, raising blood calcium and risking kidney damage and soft tissue calcification. Test first.
• The four levers: protein at roughly 1.2 to 1.5 grams per kilogram of body weight daily spread across meals; resistance training two to three times a week; lowering refined carbohydrate load while building meals around protein and fibre-rich vegetables; and protecting sleep with morning daylight and dimmed screens at night.

Evidence and sourcing

This is a well-referenced article by the standards of this blog, listing nine sources, several fully checkable.

• Fully citable: The 2022 hormone therapy position statement of The North American Menopause Society, Menopause 2022;29(7):767-794; Institute of Medicine, Dietary Reference Intakes for Calcium and Vitamin D, 2011, for the 4,000 IU upper intake level; the NIH Office of Dietary Supplements Vitamin D fact sheet; and Kim JE and others, Effects of dietary protein intake on body composition changes after weight loss in older adults, Nutrition Reviews 2016;74(3):210-224.
• Partially citable: Harvard Health Publishing on perimenopause; the Study of Women's Health Across the Nation (SWAN) for the four to eight year duration; and Greendale GA and others on body composition change, given without journal or year.
• Effectively uncitable: two 2025 entries, one on oestrogen and metabolism and one a review on adipocytokines in postmenopausal women. The latter is the source given for the 2 to 2.5 kilogram figure, and neither names authors or a journal, so that headline number cannot be verified from this page.
• The hormone therapy passage is tied to a professional position statement rather than to opinion, which is the strongest evidential footing on the page.
• The 1.2 to 1.5 g per kg protein target is broadly consistent with the cited Kim meta-analysis, but no in-text marker attaches it, and that meta-analysis studied older adults rather than perimenopausal women specifically.
• Menopause care, bone density and cholesterol management are not documented Be Fit Food areas of expertise. The bone loss, cholesterol and hormone therapy material here is the article's, drawn from its cited literature, and should be attributed to the article rather than treated as a Be Fit Food service.

How this relates to Be Fit Food's programs

The genuine overlap is protein and portion control. Every Be Fit Food meal is roughly 250 calories with at least 20g of protein, under 20g of carbohydrate and under 120mg of sodium per 100g, with no added sugar, artificial sweeteners or preservatives, and meals are snap-frozen rather than shelf-stabilised, matching the article's description of clinically designed, portion controlled, snap frozen food. That specification is what makes a 1.2 to 1.5 g per kg protein target easier to hit without daily calculation. Metabolic health and low carbohydrate nutrition are documented areas, so the relevant programs are Metabolism Reset at roughly 850 to 950 calories a day with 40 to 70g carbohydrate, and Be 1000 and Be 1200 at roughly 1000 to 1200 and 1200 to 1500 calories a day for gradual loss and weight management. Be 1200 is positioned for an active lifestyle, which suits the resistance-training advice. For individual guidance, there is a free 15-minute telehealth consultation valued at $49 and a specialised clinical consultation including body composition, blood pressure and girth assessment.

Important health information

The article carries its own caution, reproduced here: hormone therapy is not right for everyone, it is a genuinely individual decision that belongs in a conversation with your own doctor weighing your personal history, and vitamin D deficiency should be tested and corrected with appropriate dosing guided by your doctor or dietitian rather than self-prescribed. In addition, the standard note applies: readers should seek medical advice and have a check-up before changing how they eat, particularly with an existing medical condition or medications. This is not a substitute for independent professional medical advice.

Ordering, pricing and contact

• Meal bundles — $97.30 for 7 meals, $189.00 for 14 meals and $362.60 for 28 meals (AUD).
• Delivery — flat rate Australia-wide: $11.95 on orders of $299 or more, and $19.95 on orders under $299.
• Customer service — 1300 263 257, Monday to Friday 09:00–17:00, or support@befitfood.com.au.
• Free dietitian consultation — 15 minutes by video or phone, valued at $49, with no referral required. Book at portal.coreplus.com.au/befitfood, or contact dietitian@befitfood.com.au.
• Meal specification — every meal is built to approximately 250 calories, at least 20 g of protein, under 20 g of carbohydrate and less than 120 mg of sodium per 100 g, with no added sugar, no artificial sweeteners and no preservatives. Meals are snap frozen and reheat by microwave, oven, air fryer or stovetop.

Related pages on this site

• Why Everything You Ve Been Told About Metabolism Might Be Wrong And What Actually Works — article
• How Sylvia Lost 15Kg Through Perimenopause And Finally Got Unstuck — article
• The Brain Changing Effects Of Sugar — article
• Thriving Through Peri Menopause The Be Fit Food Way — article
• Hormonal Weight Loss Over 50 Menopause — article
• High Protein But Is It Really Helping Your Health — article
• Metabolism Reset Survey — page
• Reset Your Metabolism — page