Part 2: Understanding obesity biology, stigma, and why weight loss is so difficult

Описание: When it comes to weight loss, the problem isn’t your stomach — it’s your brain.

In part 2 of this talk, Professor Emeritus Professor Dr Chan Siew Pheng explains why eating behavior is regulated by multiple centers in the brain, not willpower alone. She breaks down the science behind homeostatic eating (eating in response to true hunger for survival), hedonic eating (eating for pleasure), and the brain’s self-regulation system that influences decision-making around food.

The challenge begins when weight loss triggers the body’s natural defense mechanisms. As people eat less and move more, they may initially lose weight — but the body responds by slowing metabolism, increasing hunger, and reducing feelings of fullness. In effect, the body actively works to regain lost weight, which explains why many people experience frustration and repeated cycles of weight regain.

Professor Dr Chan outlines how modern clinical guidelines approach obesity as a chronic disease, emphasizing that medications must always be used alongside lifestyle changes such as diet and physical activity. Treatment is not a shortcut, but a medical tool to support long-term health.

The talk also explores the role of high-dose semaglutide, explaining how it differs from lower-dose formulations and why it carries strong clinical trial evidence. Studies show significant, sustained weight loss — in some cases comparable to bariatric surgery — without the need for invasive procedures.

Importantly, clinical trials demonstrate that this treatment leads to greater fat loss with less muscle loss, addressing concerns about weakness and functional decline. Reductions in visceral fat, particularly around the abdomen, translate into meaningful improvements in blood sugar, cholesterol levels, and cardiovascular risk.

Beyond the scale, Professor Dr Chan highlights how weight management today is measured by health outcomes, not just pounds or kilograms lost. Large clinical trials, including cardiovascular outcome studies, show reduced risks of heart attacks, strokes, and cardiovascular death — even in patients without diabetes.

This session offers a science-based perspective on why weight loss is so difficult, how the body resists change, and how modern obesity care is evolving toward compassionate, evidence-driven treatment.