October 2025 // Dopamine, Obesity & Addiction
Is overeating really that different from drug addiction? Your brain might not think so.
It sounds extreme, but neuroscience shows that obesity and addiction light up the same brain circuits.
Our reward system (the dopamine-driven engine of survival) evolved to reinforce eating, drinking, and nurturing. It tells us: that felt good, do it again. But in today’s world of supercharged foods and powerful drugs, this ancient system is overwhelmed.
– Drugs like cocaine, nicotine, and alcohol release up to 10 times more dopamine than natural rewards.
– Overeating rich, calorie-dense foods can overstimulate this same system.
Brain imaging studies* reveal a haunting similarity: both obese individuals and those with addictions show fewer dopamine receptors in the striatum, meaning they experience less pleasure from everyday life. The brain adapts to the flood of dopamine by dulling its response; pushing people to consume more just to feel “normal.”
This isn’t just about willpower. It’s about biology. It’s about a brain wired for survival, hijacked by abundance.
So maybe the real question isn’t: Why can’t they stop?
The real question is: How do we help a brain that has learned to equate survival with self-destruction?
References
Volkow, N. D., Fowler, J. S., & Wang, G.-J. (2003). The addicted human brain: insights from imaging studies. The Journal of Clinical Investigation, 111(10), 1444–1451. https://doi.org/10.1172/JCI18533
Volkow, N. D., Wang, G.-J., Fowler, J. S., & Telang, F. (2008). Overlapping neuronal circuits in addiction and obesity: evidence of systems pathology. Philosophical Transactions of the Royal Society B: Biological Sciences, 363(1507), 3191–3200. https://doi.org/10.1098/rstb.2008.0107
Wang, G.-J., Volkow, N. D., Logan, J., Pappas, N. R., Wong, C. T., Zhu, W., Netusil, N., & Fowler, J. S. (2001). Brain dopamine and obesity. The Lancet, 357(9253), 354–357. https://doi.org/10.1016/S0140-6736(00)03643-6