Macro Calculator for Women Over 40
Macros for women over 40: adjustments for perimenopause and higher protein intake.
Why do macros change for women over 40?
From age 40, women enter perimenopause: oestrogen levels begin to fluctuate and decline, reducing insulin sensitivity, increasing the tendency to accumulate abdominal fat and accelerating muscle loss (sarcopenia) [¹]. Basal metabolism drops approximately 50–100 kcal/year after 40, not due to age per se but to the associated loss of lean mass [²]. High protein (1.8–2.2 g/kg/day) is the most effective intervention to counter sarcopenia, while controlling the glycaemic index of carbohydrates improves insulin sensitivity [³].
How to use this calculator
Select 'Female', actual activity level (without overestimating) and 'High' protein. If you are perimenopausal or menopausal, slightly reduce carbs (−50–100 g vs earlier stages) and prioritise low-glycaemic index sources. The calorie target may need to be 100–200 kcal lower than what you ate at 30 for the same weight.
Macro adjustments by stage for women 40+
| Stage | Protein (g/kg/day) | Carbs | Fat | Key change |
|---|---|---|---|---|
| Perimenopause (40–50) | 1.8–2.0 | 35–40% | 28–32% | Prioritise protein & ↓ GI |
| Menopause (50–55) | 2.0–2.2 | 30–35% | 30–33% | ↑ Calcium & vitamin D |
| Post-menopause (55+) | 2.0–2.4 | 28–33% | 30–35% | Active muscle preservation |
FAQ
1Is weight gain inevitable with menopause?
Not inevitable, but it requires active adjustments. The oestrogen decline redistributes fat to the abdomen and reduces BMR. With high protein, strength training and calorie control, maintaining or improving body composition during menopause is possible [¹].
2Should I take more calcium after 40?
Yes. Women 40+ should aim for 1,000–1,200 mg/day of calcium (vs 800 mg during fertile years) to compensate for accelerated bone loss from falling oestrogen [³]. Sources: dairy, tofu, sardines, broccoli, fortified plant milks.
3Is strength training important at this stage?
It is the most important thing you can do. Strength training 2–3 times per week preserves muscle mass, improves bone density, increases insulin sensitivity and raises BMR — everything perimenopause erodes [²].
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