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If you are a woman trying to lose weight, a calorie deficit means the same thing it means for anyone. You eat fewer calories than your body burns, and it makes up the gap from stored fat. Where women get caught out is the size of the numbers. Most of us burn something like 1,500–2,000 calories a day, so the usual advice to cut 500 is a much bigger cut than it sounds. A gap of 15–25% of your daily burn is kinder and easier to keep. For many Indian women, that means eating around 1,250–1,600 calories a day.
You can work out your own number in five minutes with a phone calculator, as shown below. Keep some protein in every meal. If your number comes out under 1,200, get a doctor involved. Periods, PCOS and menopause can all shift things, so give it four weeks before you decide whether it is working.
How many calories should a woman eat to be in a deficit?
You need two numbers: what your body burns at rest, and how much you move on top of that. For the first, most calculators use the Mifflin–St Jeor equation. The version for women is 10 × weight in kg + 6.25 × height in cm − 5 × age − 161. It comes from a 1990 study that measured resting energy use in 498 adults.
Take Priya, who is 34, teaches at a school in Lucknow, weighs 62 kg and is 155 cm tall. Ten times her weight is 620, her height times 6.25 is about 969, and five times her age is 170. Take away 170 and 161, and her BMR is about 1,258 calories a day.
Then multiply by an activity factor. Calculators use 1.2 if you sit most of the day and 1.375 if you walk a fair amount. Priya is on her feet through four or five classes, but she drives to school and spends the evenings marking copies at the dining table. Her daily burn sits somewhere between 1,510 and 1,730. Call it 1,600.
A 20% cut from 1,600 is about 320 calories, which puts her target near 1,300 a day. Priya is an illustration rather than a patient, so put your own numbers in as you read. The equation was fitted to American adults, so treat its answer as a first estimate that your scale will correct over a few weeks.
Her colleague Rahul, who teaches physics down the corridor, is the same age but 75 kg and 170 cm, and burns about 2,270. If both of them follow the usual advice to cut 500 calories, he is left with 1,770 and she is left with 1,100. That is why a diet your husband finds easy can leave you hungry by eleven every morning. Cutting a fifth of your own burn keeps it fair.
What is the lowest number a woman should eat?
Most crash diets go well below where a woman's body runs comfortably. The useful idea here is energy availability. That is what you eat minus what you burn in exercise, divided by your lean body mass. It is the fuel left over for everything else your body has to run, including your hormones.
Doctors in the US work from a 2013 obesity guideline that suggests 1,200–1,500 calories a day for most women trying to lose weight. A shorter Indian woman who sits most of the day will often land at the bottom of that range. Going much below it is where problems start.
A 2003 study by Loucks and Thuma tested where that floor sits. Young women with regular periods were put on measured diets and supervised exercise for five days at a time. As long as they had at least 30 calories per kilo of lean mass left over, the hormone pulses that trigger ovulation carried on as normal. Below that, they were disrupted.
Here is how it looks for Priya. With about 38 kg of lean mass, 30 per kilo is roughly 1,140 calories. If she eats 1,300 and burns 250 on an evening walk and a workout video, about 1,050 is left. That is under the line. It is also why a strict diet plus a new exercise habit sometimes brings a late or missed period.
The study was short, in a lab, and in women of normal weight. Lean mass and exercise burn are also hard to measure at home, so 30 per kilo is a pointer rather than a test you can run on yourself. The practical lesson is to eat back some of what a hard workout burns. If your periods change while you are dieting, ease off the cut and speak to a doctor.
Does your menstrual cycle change your calorie needs?
A little, and mostly in the week or two before a period. Davidsen, Vistisen and Astrup reviewed the research on energy balance across the cycle. In the luteal phase, from ovulation until your period starts, women tend both to eat more and to burn slightly more. Cravings for carbohydrate and fat are also more frequent then.
That explains the week when the plan feels impossible, even though nothing on the plate has changed. Some women do better if they build in a little slack for those days. An extra katori of curd, or a fruit in the afternoon, costs very little. It is easier to keep up than forcing your way through it.
The reviewers were careful to say nobody had yet tested whether matching the deficit to each phase actually improves weight loss. So there is no case for a complicated cycle-synced diet. The simpler lesson is about the scale. Compare the same week of your cycle from month to month, rather than this week with last week, and a premenstrual bump stops looking like failure.
Sources: [4]
How does a calorie deficit work with PCOS?
Polycystic ovary syndrome affects roughly one woman in eight to twelve of reproductive age, and extra weight tends to make its symptoms worse. A calorie deficit works with PCOS in the same way, and losing weight usually helps the condition itself.
A Cochrane review pulled together the trials of diet, exercise and behaviour change in women with PCOS. Lifestyle changes brought weight down a little. They also lowered the free androgen index, a marker of the male-type hormones behind acne and facial hair. The trials were small and the evidence weak, so nobody can say exactly how big the effect is.
A second review asked whether the kind of diet matters. The differences were small. A low-glycaemic-index diet helped periods become more regular in one study, and lower-carbohydrate diets cut insulin resistance slightly more. In most studies, though, losing weight helped PCOS whatever the diet.
Day to day, the deficit does most of the work. The food choices mostly decide whether you can keep it going past the first month. For many women with PCOS, that means fewer refined carbohydrates: some of the white rice swapped for dal and vegetables, and a protein food at breakfast. Insulin resistance is common with PCOS and can make the same deficit feel harder going, so a slow month is not a sign you did it wrong.
Why does a calorie deficit feel harder around menopause?
Many women notice it first at the waist. The same kurtas start pulling around the middle while the scale barely moves, and it is easy to think you are doing something wrong. A four-year study from Louisiana explains part of it. Jennifer Lovejoy's team scanned 156 women each year as they approached menopause.
The women who reached menopause during the study gained fat, and only they put it on deep inside the abdomen. Their energy use while asleep dropped by 7.9%, against 5.3% for women still having periods, and they burned a third less fat. They had also started moving less about two years before their last period.
Sunita, 49, is a bank officer in Indore. She weighs 70 kg, stands 158 cm and spends most of the day at a desk, so she burns about 1,540 calories. Cutting a fifth leaves her near 1,230, with almost nothing left to trim.
What usually helps Sunita more than a smaller plate is two strength sessions a week, a brisk walk after dinner, and dal, curd or eggs at breakfast. If a month of that changes nothing, ask for a thyroid test and a fasting sugar. Both tend to drift at this age, and either can slow things down without any obvious sign. Her doctor can read the results with her and adjust the plan from there.
Sources: [7]
How do you keep muscle while eating less?
Eat less, and the body takes some of the shortfall from muscle as well as fat. A review of 52 studies in adults over 50 counted how often that happened. In 81% of the groups who only dieted, at least 15% of the weight they lost was fat-free mass, which includes muscle. In groups who also exercised, that fell to 39%.
A study from the University of Alabama shows what exercise protects. Gary Hunter's team put 140 women, all still having periods, on an 800-calorie diet until each had lost about 11 kg. One group walked or jogged for 40 minutes three times a week. Another did ten strength exercises, two sets of ten, three times a week. A third group did no exercise.
In the no-exercise group, daily energy use fell after the weight came off, including the everyday movement outside workouts. In both exercise groups, total daily burn held steady. That matters for keeping the weight off. A body that burns less after dieting needs ever smaller meals just to stay where it is.
For an Indian woman starting at home, two strength sessions a week is enough to begin. Do squats to a chair, wall push-ups, rows with a filled water bottle and glute bridges on a mat. Pair that with a protein food at every meal. A day near 1,300 calories might be two besan chillas with curd, then two rotis with dal and sabzi at lunch. Add roasted chana with tea in the evening, and paneer bhurji with vegetables and one roti for dinner.
How do you check the deficit is working?
Weigh yourself on waking, after the toilet, three or four mornings a week. Write it down and look at the weekly average, not single days. Then compare the same week of your cycle across months, because the days before a period often read heavier.
Over four weeks, a fall of roughly a quarter to half a kilo a week means your estimate is close. If nothing has moved, check intake before cutting further. Cooking oil, ghee on rotis, sugar in two cups of chai and evening snacks are where most estimates go wrong. Measure the oil for a week before you decide the formula is wrong.
Keep a tape measure next to the scale and check your waist at the navel once a fortnight. If the waist comes down while weight holds steady, you are most likely losing fat and holding on to muscle. That pairing is what Metaboliq's doctor-led plans track too, alongside blood results, because the aim is to lose up to 20% of body weight and keep the muscle. A late or missed period, poor sleep, feeling cold, hair fall or workouts getting harder each week mean the cut is too steep. Eat a little more, and talk to a doctor.
Sources: [2]