World Obesity Day 2026: Cardiologist explains how weight gain increases the heart’s workload

Health risks of obesity: In many patients, weight gain precedes hypertension, diabetes, and abnormal lipid levels (Image: Pexels)

• Obesity is linked to serious metabolic and heart risks
• Even modest weight gain raises blood pressure and cardiac risk
• Heart disease now appears earlier, affecting younger adults

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World Obesity Day is a good reason to look beyond the weighing scale and the tired clichés. For years, obesity has been boxed into conversations about looks, laziness, and lifestyle indulgence. But in hospital corridors and cardiology OPDs, the picture is far more serious, and far more complex.

One of the biggest myths around obesity is that it is primarily about appearance or poor lifestyle choices, Dr Anjan Siotia, Director of Cardiology, BM Birla Heart Hospital, tells Moneycontrol. “In clinical practice, we see obesity very differently,” he says.

When a patient walks in carrying excess weight, cardiologists do not simply record kilograms. They check blood pressure, blood sugar, cholesterol levels, kidney function, and the broader metabolic profile.

Also read | How obesity can lead to another chronic diseases

“We don’t look at weight in isolation. Obesity often sits at the centre of multiple silent changes happening inside the body,” Dr Siotia explains.

Recent findings suggest what doctors are already witnessing. More than half of cardiovascular deaths are linked to metabolic risk factors. A high BMI is rarely the only red flag. Often, it is the first visible sign of deeper trouble brewing quietly within.

The silent damage myth

The notion that “a few extra kilos don’t matter” has become dangerously casual. In reality, gradual weight gain steadily increases the heart’s workload. It fuels inflammation, disrupts lipid balance, and accelerates cardiovascular ageing, often without dramatic warning signs.

In many patients, weight gain precedes hypertension, diabetes, and abnormal lipid levels. Says Dr Siotia, “By the time symptoms appear, damage to blood vessels may already be underway.”

Also read | Why is obesity growing in India? Experts list causes of the epidemic

What makes the situation particularly concerning in India is the age shift. “Heart disease is now appearing nearly a decade earlier than expected. Sedentary routines, erratic sleep, chronic stress, and easy access to calorie-dense food have created the perfect storm,” the expert says.

5 common obesity myths

Dr Siotia shares five myths about obesity that need busting.

It is only about willpower: Obesity is not simply a failure of discipline. Hormones, metabolism, genetics, sleep patterns, stress, and environmental factors all influence weight regulation. Reducing it to willpower oversimplifies a complex medical condition.

A few kilos make no difference: Even modest weight gain increases blood pressure, worsens insulin resistance, and strains the cardiovascular system. Over time, these subtle shifts compound into significant cardiac risk.

Obesity is purely cosmetic: Excess weight is not just about body image. It is often the earliest visible indicator of metabolic imbalance affecting blood vessels, kidneys, and glucose regulation.

Young people are safe: Cardiologists are now seeing heart disease in youngsters. Obesity-related metabolic changes are beginning in the 30s, and sometimes sooner, challenging the myth that heart risk belongs only to older adults.

Weight loss is about looking better: “The goal is not cosmetic weight loss. It is metabolic correction and long-term heart protection,” emphasises Dr Siotia. Sustainable lifestyle correction, alongside blood pressure and glucose control, meaningfully reduces cardiac risk.

FAQs on Obesity

1. What is a common misconception about obesity?

Obesity is not just about appearance or poor lifestyle choices. It involves complex factors like hormones, metabolism, genetics, and environmental influences.

2. How does obesity affect overall health?

Obesity increases blood pressure, worsens insulin resistance, and strains the cardiovascular system, leading to significant cardiac risk over time.

3. Is obesity only a concern for older adults?

No, obesity-related heart disease is now appearing in younger individuals, starting in their 30s or even earlier.

4. Can a few extra kilos really impact health?

Yes, even modest weight gain can increase blood pressure, worsen insulin resistance, and strain the cardiovascular system, increasing cardiac risk.

5. Is weight loss solely about improving appearance?

No, the goal of weight loss is to correct metabolic imbalances and protect long-term heart health, not just to look better.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for specific health diagnosis.