Pathophysiology of Obesity, Part 8 — Why Your Body Defends Fat Mass

Pathophysiology of Obesity, Part 8 — Why Your Body Defends Fat Mass

Why is losing weight so hard and keeping it off nearly impossible? The answer lies in how our brain and gut are wired to protect fat mass, just like they protect red blood cells, bone, or muscle mass.

Every nutrient we consume has receptors in the gut that signal to the brain, telling it how to regulate energy production, storage, and use. When you go on a calorie-restricted diet, your body interprets this as a threat. In response, your brain revs up hunger, lowers energy expenditure, and tries to restore the fat mass.
A landmark study in the New England Journal of Medicine showed that even weeks after weight loss, hunger hormones remained elevated and the drive to eat stayed high. This explains why most people regain weight after dieting. The body's biology pushes them back to their set point, the fat mass the body wants to defend.


The bottom line: calorie restriction alone rarely works long term because the body fights back. The real challenge isn't just losing weight, it's regulating the biology of energy balance so the body no longer fights to restore fat. Next episode: yo-yo dieting and the biology of weight cycling.

🌐 Learn more at weightandmetabolism.com

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