metaboliq
What does metabolism mean?
The word covers every chemical process your body runs to stay alive: breathing, keeping your temperature steady, contracting muscles, digesting food, running the brain. After a meal, digestion breaks food into sugars, fatty acids and amino acids. Some of that fuel is burned within the hour and the rest is stored.
Read the full section
Textbooks divide the chemistry into catabolism, which breaks molecules down and releases energy, and anabolism, which spends energy to build. Climbing four flights of stairs when the lift is out burns glucose in your thighs; that is catabolism. The day after a workout, your muscles lay down new protein, and after lunch your liver refills its glycogen; that is anabolism, and so is the constant replacement of skin and blood cells. Both run all day. What you eat, how much you move and how you sleep tilt the balance.
In everyday Indian conversation, and in most searches, metabolism just means the calories you burn, and that number decides whether the same dinner leaves you heavier, lighter or unchanged a month later. Doctors keep the phrase metabolic disorder for faults in specific chemical pathways, which show up on blood tests rather than in how quickly someone gains weight.
Sources: [1]
Your metabolic rate, in three parts
A day's burn has three parts. The basal metabolic rate, what your heart, brain, liver, kidneys and muscles use at rest, is the biggest. Processing food costs another 5 to 15%, and movement accounts for whatever is left, which is where people differ most.
Read the full section
By movement, researchers mean far more than workouts. Cooking on your feet, carrying the shopping up two floors, pacing on phone calls and fidgeting in a meeting all count, under the clumsy name non-exercise activity thermogenesis, or NEAT. In one US experiment, volunteers ate 1,000 calories a day more than they needed for eight weeks. Two-thirds of the extra energy they burned went on NEAT, and the fidgeters and pacers stored as little as a tenth of the fat of the stillest people.
If you and a friend eat much the same and only you gain, compare the hours each of you spends sitting before you suspect your metabolism. For your own numbers, a BMR calculator estimates the resting part from your weight, height, age and sex, and a daily energy calculator adds activity on top.
- Basal rate: organs at rest, the largest share
- Digesting food: 5 to 15% of the day
- Exercise: the sessions you plan
- Everyday movement: walking, standing, chores
Does metabolism slow down with age?
Much less than people assume, and much later. In 2021 a group of researchers writing in Science pooled doubly labelled water measurements, the gold standard for energy use in daily life, from people aged 8 days to 95 years. Adjusted for body size, energy use held flat from about 20 to 60, then slipped slowly.
Read the full section
The surprises were at the start. A one-year-old burns about 50% more energy for its size than an adult does, which anyone who has chased a toddler will believe, and the rate eases to adult levels by about 20. Pregnancy didn't push the size-adjusted rate up either, and there was no sudden drop at 30 or 40 anywhere in the data.
That leaves the weight people gain in their thirties and forties needing another explanation, and the usual ones are a desk job, no more weekend cricket or badminton, later nights, and muscle that shrinks a little every year it is not used. All of those can change. From 60 the rate does start to fall, which makes holding on to muscle even more important.
Sources: [5]
Fast metabolism, slow metabolism: what is real
Basal rates do differ between people, and most of the difference has a plain cause. In a Scottish study of 150 adults, fat-free mass explained 63% of the variation in basal metabolic rate, fat mass 6% and age 2%. A bigger, more muscular body burns more at rest.
Read the full section
Muscle itself burns modestly: a kilo of it uses about 13 calories a day at rest and a kilo of fat about 4.5, while the liver, brain, heart and kidneys run far hotter per kilo. It counts because most adults carry a lot of it, and because it is the one tissue on that list you can add to. A quarter of the variation in the Scottish study stayed unexplained, and in men part of it tracked thyroid hormone.
When a metabolism really is running fast or slow, the thyroid is the usual suspect. An overactive gland can bring weight loss despite a good appetite, a racing heart, tremor, heat intolerance and loose stools. An underactive one tends to bring tiredness, feeling cold, constipation, dry skin and some weight gain. A thyroid blood test tells either apart from an ordinary bad month.
Why many Indians carry more fat at the same weight
In 2004 two diabetes researchers, one from Pune and one from London, put their own bodies side by side in The Lancet. They had the same body-mass index. The Indian man carried far more fat and far less lean tissue, and they named it the Y-Y paradox, after their surnames.
Read the full section
Doctors call the pattern the thin-fat Indian, and it matters for metabolism because lean tissue does most of the resting burn and soaks up most of the sugar from a meal. Less of it means a lower burn, and insulin starts straining at a weight that looks healthy on paper. Indian guidelines lowered the thresholds to match: a BMI of 23 is overweight here, against 25 internationally, and a waist above 90 cm in men or 80 cm in women counts as abdominal obesity.
If you are trying to lose weight, guard your muscle while the fat comes off, because you may be starting with less of it than the scale implies. Strength work and protein do that job, and a tape measure at the waist, used alongside the scale, shows whether the loss is coming from the right place.
Why dieting slows your metabolism
Eat much less for long enough and your body starts burning less, by more than the lost weight would explain on its own. This is called metabolic adaptation, and its best-known measurement comes from contestants on the American television show The Biggest Loser.
Read the full section
Fourteen of them lost 58 kg on average over 30 weeks of severe dieting and hours of daily exercise, and their resting burn fell by about 610 calories a day. Six years on they had put back 41 kg, yet their resting rate was still 704 calories below where it began, and around 499 below what their body size predicted. Few people diet that hard, so treat these figures as the far end of the range.
Some of the drop is muscle. A fast, low-protein diet without strength work strips lean tissue along with fat, and less lean tissue burns less and makes regain easier. Our own programme's goal is written with that in mind: "Lose up to 20% of your body weight — and keep your muscle". Results vary; your doctor decides what is right for you. Protein targets and strength sessions start in the first week for everyone on it.
Muscle: the part of your metabolism you control
If you lift while you diet, your metabolism holds up far better. A trial in 94 women who each lost about 12 kg shows it: the ones who did resistance training finished with the same fat-free mass, resting burn and strength they started with. The women who did only aerobic exercise, or nothing, lost lean mass and burned less at rest afterwards.
Read the full section
Protein does its part alongside the training. In a review of 49 strength-training trials, extra protein added to muscle gains up to about 1.6 g per kilo of body weight a day and nothing beyond that. At 70 kg the ceiling works out at roughly 112 g a day, which is easier to reach in three meals than it sounds once dal, curd, paneer, eggs, soya, fish or chicken turn up at each one.
None of this needs a gym membership. Chair squats, wall push-ups and band rows two or three times a week will do at first, provided you make them a bit harder every few weeks. One caution: if a blood report has ever flagged your kidneys, talk to a doctor before pushing protein up.
Sleep, stress and your metabolism
How long you sleep affects which kind of weight you lose. In a two-week study at a university sleep laboratory, adults on an identical reduced-calorie diet spent either 8.5 or 5.5 hours in bed each night. On the short schedule, the share of their weight loss that came from fat fell by 55%, and their loss of fat-free mass rose by 60%.
Read the full section
The short sleepers were hungrier as well, and their bodies burned proportionally less fat. With ten volunteers over 14 days the exact percentages are rough, but anyone who has tried to diet through a deadline week will know the pattern: biscuits with the 4 pm chai, and the evening walk quietly dropped.
Stress tends to hit the same two places, your sleep and your snacking, and the remedies cost nothing. Keep the same bedtime every night, make the room dark and cool, and leave the phone charging in another room for the last half hour. Give that a fortnight before spending money on anything sold as a metabolism booster.
Sources: [9]
Foods that boost metabolism, and supplements that do little
Protein is the one food with a real, everyday effect. Of the calories in protein, a bigger share is used up in digesting and processing it than for carbohydrate or fat, and protein keeps you full for longer. Putting dal, curd, paneer, eggs, soya, fish or chicken in every meal is the most useful metabolism food there is.
Read the full section
The famous boosters work, but only a little. Across 11 studies, green tea catechins gave an average of about 1.3 kg more weight lost than control, and less in people who already drank plenty of coffee or tea. Capsaicin, the heat in chillies, raises energy use and fat burning slightly and may curb appetite, but the effect is small. Enjoy both, but do not count on them.
Supplements sold as metabolism enhancers are a different matter. Most have little good evidence, and some blends contain stimulants that can raise heart rate and blood pressure. Spend the money on better food instead. Eating many small meals does not stoke metabolism either: the energy spent on digestion depends on how much and what you eat, not on how often.
- Protein at every meal
- Green tea or black coffee, unsweetened
- Chillies, if you enjoy them
- Whole foods over packaged boosters
Sugar metabolism and metabolic health
Sugar metabolism is the way your body handles glucose, and for most adults it is where metabolic trouble begins. After a meal, insulin moves glucose into muscle, liver and fat cells. When those tissues respond poorly, the pancreas makes more insulin to compensate, and blood sugar can look normal for years while insulin quietly runs high.
Read the full section
Doctors increasingly judge metabolic health on five measurements instead of weight alone: waist, blood sugar, blood pressure, triglycerides and HDL cholesterol. When American researchers applied strict cut-offs to a national survey, only 12.2% of adults passed on all five. Fewer than a third of the adults with a normal weight passed, which is a good reason not to trust the scale on this.
Indian waist limits are tighter than American ones, at 90 cm for men and 80 cm for women against 102 and 88 cm, and a tape measure at the navel is a fair first check. For blood tests, the comprehensive metabolic panel that labs sell as a metabolism test covers glucose, kidneys, liver and salts but not HbA1c or insulin. Those two show the years of rising insulin before the sugar itself moves, so ask for them by name.
5 markers of metabolic health
- Waist
- Fasting glucose
- HbA1c
- Blood pressure
- Triglycerides
- HDL cholesterol
How to increase your metabolism: a four-week start
What reliably raises your burn over months is more muscle, enough protein, more movement in ordinary hours and enough sleep. Each of these makes the others easier, and none of them needs special food or equipment.
Read the full section
If you want a starting order, begin with food. Get a protein food onto every plate (dal and curd, eggs, paneer, soya, fish or chicken) and walk for ten minutes after lunch and dinner. A week or so later, add two short strength sessions at home: chair squats, wall push-ups, and rows with a resistance band looped round a door handle. In the third week, set a bedtime that allows seven hours, and wear a step counter for a few days, which most people find humbling. By the fourth, the strength work should feel easier than it did, so add a little load or a third session.
Give it a month. If the scale has not shifted, or you feel cold and drained most days, get your blood tested before you decide the problem is willpower. Thyroid, insulin, sugar and vitamin levels can each hold weight in place, and Metaboliq starts there, with the test and a doctor's reading, before any plan is written.
- Week 1Protein and walks
Every meal, after meals.
- Week 2Strength at home
Two short sessions.
- Week 3Sleep and steps
Seven hours, count steps.
- Week 4Harder, then more
A third session.
