For decades, obesity has been framed as a simple equation: eat less, move more. It is a narrative that is easy to communicate and dangerously incomplete.
What it ignores is the growing body of evidence
pointing to a far more complex reality: weight gain is as much a psychological and biological response as it is a behavioural one. Stress, sleep deprivation, and mental health are no longer peripheral factors, they are central drivers of the obesity epidemic.
As Dr Amit Maydeo, Chairman, Institute of Gastrosciences, Sir HN Reliance Foundation Hospital, Mumbai, explains, the mind–body connection plays a critical role in shaping metabolic health. When stress becomes chronic, the body responds by releasing cortisol, a hormone designed for survival but, in modern life, often working against it.
Cortisol increases appetite, promotes fat storage particularly around the abdomen and fuels cravings for calorie-dense comfort foods. Over time, this stress response disrupts insulin regulation, slows metabolism, and increases inflammation. The result is not just weight gain, but a metabolic environment primed for it.
But stress is only one part of the story.
Sleep, often sacrificed in the name of productivity, is emerging as an equally powerful factor. Poor sleep alters the body’s hunger signals in ways that are both subtle and profound. Ghrelin, the hormone that stimulates hunger, rises. Leptin, which signals fullness, declines. The body, in effect, begins to crave more while feeling less satisfied.
According to the World Health Organization, inadequate sleep is linked to a higher risk of obesity, diabetes, and cardiovascular disease. Beyond biology, it also affects behaviour—weakening impulse control and decision-making, making it harder to resist unhealthy food choices.
Then comes the most overlooked dimension of all: mental health.
Depression and anxiety affecting hundreds of millions globally, as per WHO data reshape eating behaviours in ways that traditional diet advice fails to address. Emotional eating, irregular meal patterns, and reduced motivation for physical activity are not lifestyle “failures”; they are symptoms of deeper psychological distress.
This creates a feedback loop that is difficult to break. Poor mental health leads to weight gain. Weight gain, in turn, worsens psychological distress. The cycle tightens.
What this reveals is a fundamental flaw in how obesity is approached—both socially and clinically. By focusing narrowly on diet and exercise, we overlook the underlying drivers that make sustainable weight loss so challenging.
The solution, increasingly, lies in integration.
Modern obesity care is beginning to reflect this shift. As Dr Maydeo notes, effective treatment must address both metabolism and the mind. Lifestyle changes alone are often insufficient; behavioural therapy, psychological support, and, in some cases, medical interventions become necessary.
Procedures such as Endoscopic Sleeve Gastroplasty (ESG) and intragastric balloons are part of this evolving toolkit. By reducing stomach capacity and regulating appetite, they support weight loss while improving metabolic markers like blood sugar and cholesterol. But even these interventions are most effective when combined with long-term lifestyle and mental health support.
The larger message is clear: obesity is not a failure of willpower. It is a multifactorial condition shaped by biology, psychology, and environment.
And until we start treating it that way, we will continue to misdiagnose both the problem and its solution.
