The myth: “My metabolism stopped working after 35”
"Pehle jitna khati thi utna hi khati hoon, phir bhi weight badh raha hai." Many women in their 30s and 40s tell us this. It is natural to blame a slow metabolism. But the best evidence we have says the picture is different.
In 2021, scientists published one of the largest studies ever done on this question in the journal Science. They measured how much energy thousands of people used in daily life, from newborns to people in their 90s. After adjusting for body size and muscle, they found that metabolism stays stable from about age 20 to 60, even during pregnancy, and only starts to decline after 60.
So if your metabolism isn't the main culprit, what is? The same study gives a clue: the energy your body uses goes up and down with the amount of muscle (lean mass) you carry.
What actually changes in your 30s and 40s
- Less muscle. Without strength training, many women slowly lose muscle with age. Less muscle means your body needs a little less energy every day.
- Less daily movement. Desk jobs, driving, screens and busy family life can cut thousands of steps a day without you noticing.
- Portions and snacking. Chai with biscuits, extra rotis, sweets at functions and tasting while cooking add up quietly over the years.
- Sleep and stress. Short sleep and constant stress make cravings stronger and workouts harder to keep up.
- Hormones. Around perimenopause and menopause, WHO lists symptoms such as hot flushes, difficulty sleeping and mood changes, and notes that body composition can also be affected. Read our menopause guide for more.
- Health conditions. An underactive thyroid, PCOS and some medicines can affect weight. If weight gain is sudden or comes with tiredness, hair fall or irregular periods, see your doctor.
What helps: the four pillars after 35
1. Strength training at least twice a week
This is the single most important change. WHO recommends muscle-strengthening activity on at least two days a week. At home, use a chair for squats and step-ups, filled water bottles for arms and shoulders, and your own body weight for lunges and wall push-ups. Start with 2 sets of 10–12 slow, controlled repetitions and add more as you get stronger.
2. Move more every day, not just in the workout
WHO recommends 150–300 minutes of moderate activity a week, such as brisk walking or dance cardio. Just as important is the movement between workouts: a 10-minute walk after meals, standing up every hour, taking the stairs, and doing household chores with energy.
3. Protein at every meal, from home food
- Add dal, paneer, curd, eggs, chana, rajma, soya or fish to every meal to help you keep muscle.
- Fill half your plate with sabzi or salad.
- Keep roti and rice in sensible portions; you don't need to cut them out.
- Save sweets and fried snacks for occasions rather than every day.
4. Sleep and stress
Aim for regular sleep and wake times, and protect 7 or more hours where you can. Even 10 minutes of dance, music or a walk in the evening can lower stress and make healthy choices easier the next day.
A simple weekly plan at home
- Monday: 30–40 minutes of dance cardio, then chair squats and step-ups.
- Tuesday: stick workout for posture and core, plus a brisk walk.
- Wednesday: strength with water bottles: presses, rows and lunges.
- Thursday: dupatta stretching and mobility, plus a walk after dinner.
- Friday: full-body strength with a chair and bottles.
- Weekend: a family walk, dance or yoga, and a proper rest day.
This is the shape of the FunDa weekly home plan: cardio for the heart, and prop-based strength work to protect your muscle as you age. If tummy fat is your main worry, read our belly fat guide too.
How FunDa helps women over 35
Many FunDa members are working women and mothers in their 30s, 40s and 50s. Classes are live on Zoom, women-only and done at home with ghar ki cheezein, combining dance cardio with simple strength work, so you build the habit that matters most after 35: moving and staying strong every week. We coach fitness habits; we don't diagnose or treat medical conditions, and results vary from person to person.
Sources
- Pontzer H et al. Daily energy expenditure through the human life course. Science. 2021;373(6556):808-812.
- Bull FC et al. World Health Organization 2020 guidelines on physical activity and sedentary behaviour. Br J Sports Med. 2020.
- World Health Organization. Menopause, fact sheet (16 October 2024).
- NHS. Underactive thyroid (hypothyroidism) (reviewed 28 April 2025).
