Written by Vardan Patel
Co-Creator & Health and Fitness Content Creator at FitHub 365
Vardan combines his personal experience with exercise and healthy lifestyle habits with research from reputable health organizations and scientific sources to create practical, beginner-friendly health and fitness content.
Key takeaways
- Obesity involves excess body fat that may affect how the body works, so it goes beyond appearance or willpower.
- BMI is a useful screening tool but a blunt one. It cannot show where fat is stored or whether it is causing problems.
- Many factors shape weight, including food environment, sleep, stress, medicines, genetics, income and daily routine.
- South Asian guidelines use lower BMI and waist cut-offs than international ones.
- Small, sustainable changes help most, and some people also need medical support.
Why Obesity Is More Than a Weight Problem
Most of us were taught to think about weight as arithmetic: eat less, move more, and the number falls. If that were the whole story, the world wouldn’t have a global health problem on its hands. In 2022, one in eight people worldwide was living with obesity, and 890 million of them were adults. knowledge-action-portal
So what is obesity, if not just a heavy body? The short answer is that it is a condition involving excess body fat that can affect health, and the causes and consequences reach well beyond the scale. This article explains what that means, why the usual measurements have limits, which factors push weight up, and what ordinary people can realistically do about it.
What obesity actually means
The World Health Organization describes overweight and obesity as an abnormal or excessive build-up of fat that may harm health. The most common screening tool is body mass index (BMI): weight in kilograms divided by height in metres squared. WHO classes adults with a BMI of 25 or more as overweight and 30 or more as obese. who
Notice the wording “may harm health.” Having extra body fat raises the chance of problems. It doesn’t mean every person with obesity is ill today, and it doesn’t mean someone with a “normal” BMI is automatically healthy.
Why it matters beyond appearance
Excess fat isn’t just stored energy sitting passively. Fat tissue is active, and when there is a lot of it, it can interact with blood sugar control, blood pressure, cholesterol, joints and breathing. WHO links diabetes, ischaemic heart disease and certain cancers to overweight and obesity. who
The impact isn’t only physical. A person who finds climbing stairs exhausting, sleeps badly, or avoids social situations because of how they’re treated is dealing with something larger than a number. We’ll come back to stigma further down.
Why BMI only tells part of the story
BMI is popular because it’s cheap and quick. You only need a scale and a tape measure. But it has real blind spots:
- It can’t tell fat from muscle. A strength athlete can land in the “overweight” range while carrying very little excess fat.
- It says nothing about where fat sits. Fat stored around the abdomen is generally of more concern than fat stored elsewhere.
- It can’t show whether the body is coping well or struggling.
Experts are openly debating this. In January 2025, a Lancet Diabetes & Endocrinology commission proposed a new way to think about it. It separates “preclinical obesity,” meaning excess fat with organ and tissue function still preserved, from “clinical obesity,” which is diagnosed when excess fat is linked to reduced organ function or substantial limits on daily activities. In plain terms, the question shifts from “how much do you weigh?” to “what is the excess fat doing to your body?” nih
This is a recent proposal, and it isn’t settled. Commentators have pointed out that fat-measuring tools often fail to separate harmful abdominal fat from fat under the skin, and that the real-world burden of disease under the new criteria is still uncertain. For everyday readers the lesson is simple: a single number, whether BMI or weight, is a starting point for a conversation, not a verdict. gwu
The Indian and South Asian angle
If you’re reading from India or have South Asian roots, there’s an extra detail worth knowing. Research suggests that diabetes, abnormal blood fats and other heart-related conditions appear at lower BMI and waist measurements in South Asians. For that reason, expert guidance proposes BMI of 23 to 24.9 as overweight and 25 or above as obesity, and waist measurements of 80 cm or more for women and 90 cm or more for men as signs of abdominal obesity. A WHO expert consultation in 2004 had already noted that Asian populations show different links between BMI, body fat and health risk. nih
More recent Indian expert guidance, published in 2025, goes further and looks at waist size or waist-to-height ratio alongside BMI rather than relying on BMI alone. So if your BMI sits at 24 and your waist is large, it’s reasonable to take that seriously even though international charts would call you “just overweight.”
What actually drives weight gain
WHO’s fact sheet describes the basic mechanism as an imbalance between energy taken in through food and energy used through activity. That is true, but it leaves out why the balance tips. Several factors tend to work together:
Food environment. Cheap, calorie-dense, heavily processed food is easy to find almost everywhere. Overweight and obesity, once seen as a problem of wealthy countries, are now rising in low- and middle-income countries, particularly in cities. Think of a bakery snack costing less than a plate of fruit, or delivery apps that make the least healthy option the most convenient. netzgesta
Movement built out of daily life. Many jobs, commutes and entertainment habits involve sitting for hours. Exercise sessions can’t fully offset a day that contains almost no movement.
Sleep and stress. Poor sleep and ongoing stress can change appetite, cravings and the energy to cook or exercise. A night-shift worker or a student sleeping five hours a night has a harder time with food choices than their willpower suggests.
Medical and biological factors. Genetics influence appetite and where the body stores fat. Some medicines and health conditions can also cause weight gain. These links are well accepted, but I haven’t attached a specific source here, so add one before publishing (see checklist).
Money and time. Healthy eating can be affordable, but it often takes time, kitchen access and planning. A person working two jobs doesn’t have the same options as someone with a flexible schedule.
None of this removes personal choice. It simply explains why identical advice works very differently for different people.
The health problems linked to obesity
Rather than treating this as a scary list, it helps to understand the pattern. Carrying excess fat, particularly around the abdomen, is associated with:
- Type 2 diabetes, because the body becomes less responsive to insulin
- Heart and blood vessel disease, including high blood pressure and raised cholesterol
- Certain cancers
- Joint pain and reduced mobility, as extra load falls on knees and hips
- Breathing and sleep problems, such as snoring and interrupted sleep
- Fatty liver, which often causes no symptoms early on
These are associations and risks, not guarantees. Many people with obesity never develop some of these conditions, and some people at lower weights do. Regular check-ups matter precisely because the early stages often feel like nothing.
The emotional side is real too. Weight stigma, meaning judgment or teasing about body size, can discourage people from seeing a doctor, exercising in public or talking honestly about their eating. Shame is rarely a good motivator. (A source for this point is also needed, as flagged below.)
Practical steps that fit real life
Large, dramatic changes tend not to last. Smaller shifts that you can repeat on a busy week usually do better. Here are some places to start, and you don’t have to do all of them.
Look at the plate you already eat
You rarely need to give up your food culture. Many familiar Indian meals can be adjusted rather than replaced:
- Fill half the plate with vegetables, then add dal, curd, chickpeas, eggs, fish or paneer depending on your diet.
- Keep rotis or rice, but watch the portion and pair them with protein and fibre so you feel full longer.
- Choose fruit, roasted chana, nuts or buttermilk in place of biscuits and packaged snacks when you can.
- For non-Indian diets, the same logic holds: more vegetables, beans, whole grains, lean proteins and fewer sugary drinks and ultra-processed snacks.
Be careful with drastic diets, “detox” plans and extreme restriction. They are hard to sustain and can be harmful, particularly for people with health conditions.
Make movement easier to repeat
Start with what you’ll realistically keep doing. A 15-minute walk after dinner, taking stairs, or cycling short trips all count. Strength exercises, even simple bodyweight ones at home, help preserve muscle. If you have joint pain or a medical condition, a doctor or physiotherapist can help you pick low-impact options.
Protect sleep and manage stress
Treat sleep as part of the plan, not a luxury. A regular bedtime, less late-night screen time and some form of stress relief (walking, talking to someone, breathing exercises) support the habits above.
Track more than the scale
Weight alone can mislead. You might also notice your waist measurement, energy, how your clothes fit, blood pressure and how easily you climb stairs. If you see improvement in these areas, the effort is working even when the scale hardly moves.
Know what to expect
Healthy change is usually gradual and uneven. Plateaus are normal. No single food, exercise or supplement will reverse obesity, and anyone promising fast, guaranteed results is overselling.
Common misconceptions
“It’s only about willpower.” Willpower matters, but biology, environment and circumstances shape how hard those choices are.
“A normal BMI means I’m healthy.” Not necessarily. Someone can have a normal BMI and still carry harmful abdominal fat, which is especially relevant for South Asians.
“A high BMI means I’m definitely unhealthy.” Also not necessarily. BMI is a screen, and the Lancet proposal highlights that organ function and daily functioning matter too.
“Skipping meals is the fastest fix.” It often leads to overeating later and can leave you tired and irritable. Steady, balanced meals are easier to maintain.
When to see a doctor
Speak to a qualified doctor or registered dietitian if you:
- have a very high BMI or a rapidly growing waist
- notice constant thirst, frequent urination, severe tiredness, breathlessness, or snoring with daytime sleepiness
- have diabetes, high blood pressure, thyroid issues or take medicines that might affect weight
- have tried several times without success and feel stuck
- are pregnant, planning pregnancy, or supporting a child or teenager with excess weight
Some people benefit from medical treatment, which can include structured programmes, prescribed medicines or, in selected cases, surgery. Those decisions belong with a doctor who knows your full history, not with an article.
For children, don’t use adult BMI cut-offs. Child and adolescent obesity has risen sharply, with overweight among 5 to 19 year olds growing from 8% in 1990 to 20% in 2022. A paediatrician can assess a child properly and suggest family-wide changes without making the child feel blamed. who
Frequently asked questions
Is obesity a disease?
Medical views are shifting toward yes, at least when excess fat is affecting how the body functions. The 2025 Lancet commission calls this state “clinical obesity.” The wider definition is still debated, and it differs from simply being heavier than average.
Can someone have obesity and still be healthy?
Some people with obesity have normal blood sugar, blood pressure and cholesterol for a time. But excess fat raises the risk of later problems, so regular monitoring remains sensible. Fitness and activity levels also matter, regardless of weight.
Is BMI useless, then?
No. It’s a quick screening tool and useful at the population level. It just shouldn’t be used alone. Waist measurement and blood tests give a fuller view.
What is a healthy BMI for Indians?
Indian consensus guidance treats a BMI of 23 to 24.9 as overweight and 25 or above as obesity. These cut-offs are lower than the global ones, so ask your doctor how they apply to you.
Can I treat obesity with diet and exercise alone?
For many people, sustained changes to eating, activity and sleep make a real difference. Others need additional medical support. Needing help is not a personal failure.
Do detox drinks or supplements help?
There’s no reliable evidence that detox products solve obesity, and some can be harmful. Speak to a doctor before using any supplement, especially if you take medicines.
Conclusion
Obesity is a health condition shaped by biology, environment, income, sleep, stress and daily habits, which is why it can’t be summed up by a number or by blame. The most useful move is to look past the scale: check your waist, understand what your numbers mean for your background, and build small habits you can keep. If you have symptoms, existing conditions or repeated difficulty, a conversation with a doctor is the best next step.