Macros for Weight Loss: Women Over 40
Quick Answer
Recommended macro split for women over 40 aiming to lose fat:
| Macro | Percentage | Why |
|---|---|---|
| Protein | 35 to 40% | Preserves muscle as muscle loss accelerates after 40 |
| Carbohydrates | 25 to 35% | Keeps hunger manageable, supports energy |
| Fat | 25 to 30% | Essential for hormonal health |
Example at 1,700 calories: Protein: 1,700 × 0.37 ÷ 4 = 157 g | Carbs: 1,700 × 0.30 ÷ 4 = 128 g | Fat: 1,700 × 0.28 ÷ 9 = 53 g
Women over 40 face specific physiological changes that affect weight management: declining oestrogen, accelerating muscle loss (sarcopenia), slower metabolism and potentially perimenopause or menopause. Use the free TDEE Calculator, BMR Calculator and Macro Calculator on CalConvs.
Why the Rules Change After 40
- Muscle loss (sarcopenia): Women lose approximately 1 to 2% of muscle mass per year after age 40 without resistance training. Less muscle = lower resting metabolic rate = easier to gain fat.
- Hormonal changes: Declining oestrogen affects fat distribution (more visceral/abdominal fat), insulin sensitivity and appetite signalling.
- Slower metabolism: BMR typically decreases by 2 to 3% per decade from age 30. A 50-year-old woman burns approximately 100 to 150 fewer calories per day than at 30.
- Sleep disruption: Perimenopause and menopause often disrupt sleep, which raises cortisol and hunger hormones.
- Response to restriction: Severe calorie restriction causes greater muscle loss in women over 40. Moderate deficits are essential.
Step 1: Find Your Adjusted BMR and TDEE
Use the BMR Calculator with your current age, weight and height. Then use the TDEE Calculator to find your maintenance calories.
Example (Woman aged 47, 73 kg, 163 cm, lightly active):
BMR = (10 × 73) + (6.25 × 163) - (5 × 47) - 161 = 1,353 calories.
TDEE = 1,353 × 1.375 = 1,860 calories.
For 0.5 kg per week loss: 1,860 - 500 = 1,360 calories target.
Step 2: Set Protein First
For women over 40, protein is the most important macro. Aim for 1.6 to 2.0 g per kg of body weight per day.
| Body Weight | Daily Protein Target |
|---|---|
| 60 kg | 96 to 120 g |
| 70 kg | 112 to 140 g |
| 80 kg | 128 to 160 g |
| 90 kg | 144 to 180 g |
Step 3: Set Fat for Hormonal Health
Do not drop fat below 20% of total calories. Dietary fat is essential for hormone production, vitamin absorption (vitamins A, D, E and K are fat-soluble) and joint health. Aim for 25 to 30% of calories from fat, emphasising unsaturated fats.
Step 4: Fill Remaining Calories With Carbohydrates
After protein and fat targets are set, remaining calories come from carbohydrates. Prioritise low glycaemic index carbohydrates (vegetables, legumes, oats, sweet potato) over refined carbohydrates.
Completed Macro Plan Example (1,400 calories, woman aged 47)
| Macro | Grams | Calories | Percentage |
|---|---|---|---|
| Protein | 120 g | 480 cal | 34% |
| Fat | 50 g | 450 cal | 32% |
| Carbohydrates | 118 g | 472 cal | 34% |
Frequently Asked Questions
Why am I gaining weight after 40 even though I eat the same?
Your BMR and TDEE both decrease as you age. The same calories that maintained your weight at 30 may now create a surplus at 45. Calculate your current TDEE to find your updated maintenance level. You likely need to either reduce intake by 100 to 200 calories or increase activity.
Should women over 40 do intermittent fasting?
Intermittent fasting can work for women over 40 as a tool for reducing total calorie intake. However, it should not be used aggressively during perimenopause as it can disrupt cortisol and sleep in some women. A moderate daily calorie deficit works equally well and is often more sustainable.
How much protein is too much for a woman over 40?
For healthy women over 40, intakes up to 2.2 to 2.5 g per kg of body weight per day are safe and beneficial. Very high intakes above 3 g/kg provide no additional benefit and displace other important nutrients.
Related Tools
- BMR Calculator: resting calorie burn adjusted for age
- TDEE Calculator: total daily energy expenditure
- Macro Calculator: protein, carbs and fat targets
- Protein Calculator: personalised protein target