The Nutrition Science Podcast Why So Many Americans Have Become Obese
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Oct 3, 2025 The rise in U.S. obesity rates since the 1980s has been staggering, affecting both health and healthcare costs. The podcast delves into societal shifts that have driven Americans to eat more and move less. Processed foods and larger portion sizes are increasing daily calorie intake significantly. Genetic factors combined with an environment rich in highly palatable options fuel overeating. Listeners learn the importance of tracking calorie intake and making small, consistent lifestyle changes for sustainable weight loss.
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Population Weight Rise Since 1970s
- Average American BMI rose from ~25 to ~29 over decades, adding ~15-20 pounds per person.
- This shift doubled obesity rates and increased chronic disease burden and healthcare costs.
More Calories, Less Movement
- The primary population drivers are eating more calories and moving less due to convenience and technology.
- Processed, calorie-dense foods and reduced daily activity created an obesogenic environment.
Processed Food Amplifies Food Reward
- Processed foods are engineered with flavors, textures, and dyes that increase palatability and consumption.
- People genetically predisposed to stronger food reward face greater risk in this environment.