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Obesity

Obesity is not just a cosmetic concern. It is a complex medical condition that significantly increases the risk of diabetes, heart disease, sleep apnoea, fatty liver and several cancers.1

Written by Suman Konda, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: · How we check our content

What obesity is

Obesity is a chronic disease, not a failure of willpower. It is driven by hormonal dysregulation, genetic predisposition and environmental factors that override the simple “eat less, move more” framework: in obesity, leptin levels are very high yet the brain becomes resistant to its fullness signal, and after weight loss the hunger hormone ghrelin stays elevated — in effect, appetite and metabolism actively resist weight loss for years.

Body mass index (BMI) classifies weight: 25–29.9 overweight, 30 and above obese (classes I–III). But BMI cannot distinguish muscle from fat, and for Asian populations risk thresholds are lower (23 overweight, 27.5 obese). Waist circumference predicts metabolic risk better than BMI alone: above 102 cm in men and 88 cm in women signals high risk, because visceral fat around organs is more dangerous than subcutaneous fat.1

Obesity: myths vs facts

Weight stigma is dressed up as common sense. Here is what the evidence says:

MYTH Obesity is just a lack of willpower.

FACT Hormonal dysregulation (leptin resistance, ghrelin), genetics and environment drive it. The brain perceives starvation despite abundant energy stores — hunger is hormonal, not moral.

MYTH BMI tells the whole story.

FACT BMI misses muscle-versus-fat differences and fat distribution. Waist circumference and metabolic screening say more about risk than the index alone.

MYTH You can judge someone’s health by their weight.

FACT Metabolic health varies widely at any weight. Blood tests — glucose, lipids, liver, thyroid — assess actual risk; the scale does not.

MYTH Weight-loss medicines work without lifestyle change.

FACT They work alongside diet, activity and behaviour change — and weight regain is common after stopping, so they are generally treated as long-term therapy, not a short course.

MYTH Once you lose weight, keeping it off is just discipline.

FACT Hunger hormones can stay elevated for years after weight loss, driving regain. Maintenance needs ongoing strategy — monitoring, support, sometimes continued medication — not just resolve.

What to do next: complication checks and options

Because obesity drives complications silently, screening is part of care:

TestWhy
Fasting glucose + HbA1cDiabetes and pre-diabetes are extremely common; 42–47 mmol/mol is pre-diabetes, above 48 is diabetes
Fasting lipidsRaised triglycerides and low HDL are typical; non-HDL cholesterol is the better risk marker here
TSHHypothyroidism can contribute to weight gain
LFT + FIB-4Fatty liver affects around 3 in 4 obese patients; fibrosis risk needs staging
Uric acid, vitamin DBoth commonly abnormal in obesity
Sleep assessmentSleep apnoea affects around 40% of obese adults

Treatment starts with lifestyle, but medicines now play a real role. GLP-1 receptor agonists (such as semaglutide and tirzepatide) slow gastric emptying, increase satiety and signal appetite centres directly, achieving 15–25% sustained weight loss in trials — approaching bariatric surgery outcomes — with trial evidence of fewer cardiovascular events. They are prescribed for eligible patients under medical supervision, and because regain is common after stopping, are generally treated as long-term rather than short-course therapy. Bariatric surgery remains an option to discuss for severe obesity.3

Practical notes

Weight alone is a thin record — track waist circumference, blood pressure, blood sugar and lipid reports alongside it, in date order. These metabolic markers often improve before the scale moves much, and seeing that progress helps sustain effort. Note beside each entry any medication changes, since several common drugs affect weight and metabolism.

Give your doctor the full context behind the numbers: every medicine and supplement (some antidepressants, steroids, antipsychotics and diabetes drugs promote weight gain), sleep duration and shift-work patterns, thyroid history, and previous weight-loss attempts with what happened. This history shapes which options are appropriate — it is diagnostic groundwork, not small talk.

In obesity consultations, doctors typically discuss eating patterns rather than crash diets — regular meals, sleep, physical activity built into the day, and alcohol intake, which carries significant hidden calories. The emphasis in current guidance is on sustainable habits and metabolic health, not willpower narratives. Be honest about what has and hasn't worked for you before.

Metabolic monitoring — blood sugar, lipids, blood pressure, liver tests — is usually repeated at intervals your doctor sets, often every 3 to 6 months while actively managing weight. These markers can improve meaningfully with modest weight loss, well before any target weight is reached. Keep the review schedule even when the scale disappoints; the blood work tells its own story.

In India

The metabolic blood tests that accompany obesity care — blood sugar, HbA1c, lipid profile, thyroid, liver tests — typically cost in the ballpark of a few hundred rupees each in India, though prices vary by city and lab. Annual health-check packages bundling these are widely available and often cheaper than ordering tests individually.

NABL-accredited labs across Indian cities offer these panels with home sample collection, making regular monitoring convenient. Note that Asian-specific BMI and waist cut-offs apply in India — your doctor uses these, not Western thresholds — and the reference range printed on your own report is the one that counts.

Frequently asked questions

What does BMI miss about obesity?

BMI does not distinguish muscle from fat — a muscular person can have a high BMI without excess fat. For Asian populations, risk thresholds are lower (overweight at 23, obese at 27.5). Waist circumference reflects visceral fat and predicts metabolic risk better than BMI alone.

Why does waist circumference matter more than weight?

Central obesity — excess belly fat around organs — is more metabolically dangerous than subcutaneous fat under the skin. A high waist circumference indicates visceral fat and predicts diabetes and cardiovascular risk better than weight alone.

Is obesity really a hormonal disease?

Largely, yes. It is a complex chronic disease driven by hormonal dysregulation (leptin resistance, ghrelin elevation after weight loss), genetic predisposition and environmental factors — not simply a behavioural failure. This is why appetite actively resists dieting for years.

How do GLP-1 medicines achieve such large weight loss?

They slow gastric emptying, increase satiety and directly signal hypothalamic appetite centres — tackling the hormonal drivers of hunger rather than relying on willpower. Trials show 15–25% sustained weight loss, with evidence of fewer cardiovascular events. They are prescribed for eligible patients and generally treated as long-term therapy.

Do weight-loss medicines keep working after you stop?

No — weight regain is common once the drug is stopped, with trial extensions finding most lost weight returned within a year of withdrawal. That is why these medicines are generally treated as long-term therapy alongside lifestyle, not a short course.

I've lost weight three times and regained it — is something wrong with me?
No — weight regain is the norm, not a personal failure: hormonal adaptations after weight loss actively drive hunger up and metabolism down for years. This biology is exactly why obesity is now treated as a chronic condition needing long-term strategy. Discuss a maintenance plan with your doctor rather than another short diet.
Do I qualify for weight-loss medication?
Eligibility depends on your BMI, waist circumference and related conditions like diabetes or hypertension — using Asian cut-offs in India — plus your medical history and previous attempts. It is a medical decision involving benefits, risks, costs and long-term commitment. Discuss your full history with your doctor to see if you are a candidate.
Is bariatric surgery an option I should consider?
Surgery is generally considered for severe obesity or when significant weight-related conditions persist despite other approaches — with specific BMI thresholds and a full medical and psychological evaluation. It is effective but life-altering, requiring lifelong follow-up and supplements. This is a decision made with a specialist team, not something to decide from reading alone.
Why does my doctor keep checking my blood sugar if I came about weight?
Because excess weight and blood sugar are closely linked — many people with obesity have undiagnosed prediabetes or diabetes, and the two are managed together. Catching dysglycaemia early changes the treatment plan significantly. The tests are routine metabolic screening, not an accusation — discuss the results when they come in.

References

Sources cited on this page. PubMed links open the original abstract.

  1. GBD 2015 Obesity Collaborators. Health effects of overweight and obesity in 195 countries over 25 years. N Engl J Med. 2017;377(1):13–27. PMID 28604169 · doi:10.1056/NEJMoa1614362
  2. Koskinas KC, Van Craenenbroeck EM, Antoniades C, et al. Obesity and cardiovascular disease: an ESC clinical consensus statement. Eur Heart J. 2024;45(38):4063–4098. PMID 39210706 · doi:10.1093/eurheartj/ehae508
  3. Wilding JPH, Batterham RL, Davies M, et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: The STEP 1 trial extension. Diabetes Obes Metab. 2022;24(8):1553–1564. PMID 35441470 · doi:10.1111/dom.14725
Medical Disclaimer: This page is for general educational purposes only and does not constitute medical advice. Always consult a qualified doctor for diagnosis and treatment.
Written and medically reviewed by Suman Konda, Clinical Pharmacist · Sources linked to PubMed · Not medical advice: see our disclaimer