Weight loss myths worth unlearning

Crash diets, spot reduction and detox teas. What the evidence actually says, and why assessment comes first.

Most weight advice fails for the same reason: it treats a medical subject as a moral one. You cannot choose where fat comes off. Sweating harder is not burning more. Rice is not the enemy. And weight that changes in a way you cannot explain is a reason for a medical assessment, not for a stricter diet.

The myths that cost people the most time

Spot reduction. This is the most expensive myth in the business, because an entire market of belts, wraps, creams and inch-loss machines is built on it. Where your body draws fat from is decided by genetics and hormones, not by which muscle you exercised. Abdominal work strengthens the muscle underneath; it does not select the layer above it. Anyone selling a device that targets one part of you is selling geography they cannot deliver.

Sweat as a measure of effort. In Chennai you can sweat through a shirt standing still in May, which should be enough to settle the argument on its own. Sweat is temperature control. The weight that disappears during an hour in a hot room is water, and it returns with the next glass of it. A cool-weather workout that leaves you dry can do considerably more.

Carbohydrates as the enemy. In a state where rice is the staple, plans built on removing it usually collapse within a few weeks and are replaced by something worse — skipped meals, then a large late one. Total intake across the day, portion size, and what shares the plate matter far more than banning a food group that most of the households here have eaten for generations.

Meal timing as a trick. Eating after seven, or before nine, or in a particular window, matters far less than what and how much. Where timing does matter it is usually indirect: skipping breakfast to save calories mainly changes how much you eat at eight in the evening.

Detoxes and sachets. Teas, drops, powders and herbal capsules sold without a full ingredient list are a genuine safety issue rather than merely a waste of money. Drug regulators in several countries have repeatedly found unlabelled slimming products to contain undeclared pharmaceutical ingredients. If a product will not tell you what is in it, that is the finding, not a detail.

And the oldest one: that this is simply a question of willpower. Thyroid disease, polycystic ovary syndrome, insulin resistance, obstructive sleep apnoea and several long-term prescribed medicines all affect body weight. Telling someone with an untreated thyroid disorder to try harder is not advice.

Why crash dieting backfires

Severe restriction does produce a fast number on the scale, and most of the first week of it is water. What follows is the problem.

Rapid, very low intake takes muscle along with fat, and less muscle means the body uses less energy at rest — so the same eating that maintained you before now leads to regain, which is why the cycle repeats. Very rapid weight loss also carries recognised medical risks, gallstones among them. Prolonged restriction produces nutrient deficiencies, disrupted periods, poor concentration and persistent fatigue.

There is a hair consequence too, and almost nobody connects it when it arrives. A sharp physical stress such as a crash diet can push a large number of follicles into their resting phase together, and the shedding shows up two to three months later. Patients regularly attribute it to a shampoo, a season or the water, when it belongs to a diet they abandoned in the meantime.

“The number on the scale in week one is mostly water. The muscle you lose in month one is what makes month six harder.”

The part that is genuinely medical

An assessment is not a plan and it is not a purchase. It is finding out what is actually going on.

That means a proper history — how your weight has changed and over what period, what you have already tried and what happened, your sleep, your medicines, your menstrual history where relevant, and what runs in your family. It means an examination. And where it is indicated, it means blood tests, because thyroid function, blood sugar and the hormonal picture behind PCOS are things you measure rather than guess at.

Sometimes that assessment finds a condition that needs treating in its own right. Sometimes it finds nothing, which is also useful information. Either way, what happens next is decided by the doctor with you, after your results exist — not from a brochure, and not before anyone has met you.

When a weight plan is not the right pathway

Weight loss is not the goal in pregnancy or while breastfeeding; nutrition and monitoring are, with your obstetrician. Children and teenagers need a paediatric, family-based approach rather than an adult plan.

If you have a history of disordered eating, or if food, weighing and body image currently feel out of control, a weight-loss plan can make things considerably worse. That situation needs specific help, and asking for it is the right move rather than a detour.

And one that gets celebrated when it should be investigated: weight that falls without you trying is a symptom. Unexplained loss, particularly with fatigue, fever, a change in appetite or bowel habit, needs prompt medical assessment rather than congratulations.

If your weight has changed in a way you cannot account for, or your efforts and your results have stopped matching, the useful next step is an assessment that goes looking for a reason. Everything after that follows from what it finds.

Reviewed by the Kremlin Aesthetics clinical team. Last updated 18 August 2026.