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The workout myth sounds so clean: move more, burn more, lose weight. Then the real world happens, and people who train hard still plateau, regain, or feel like their body is fighting them. We dig into why by looking at research most health conversations ignore: anthropology studies that compare daily energy expenditure and obesity across lifestyles, from hunter-gatherers and pastoralists to highly industrialised nations.

Mark shares data from a large cross-cultural paper on energy expenditure and obesity across the economic spectrum. The headline is wild: once you adjust for body size, people in modern, developed settings don’t burn dramatically fewer calories than people living ancestral lifestyles. The gap is closer to 10% than the 50/50 story many of us assume. That pushes us toward a bigger, more useful explanation for weight gain than “everyone got lazy.”

We unpack the constrained energy concept, where total daily energy expenditure is tightly regulated and the body can compensate for increased activity by lowering basal metabolic rate. That helps explain why combining intense cardio with harsh calorie restriction often leads to a stall and, later, a rebound. The strongest signal tied to higher body fat is diet quality, especially ultra-processed food intake. We break down the NOVA classifications, call out sneaky “health halo” products, and end with practical moves: prioritise minimally processed foods, build muscle with resistance training, and exercise for function, strength, and a longer healthspan.

If this reframes how you think about fat loss and metabolic health, subscribe, share this with a friend who’s stuck in the treadmill trap, and leave a review so more people can find the show. What belief about weight loss do you want to unlearn next?

For slide deck and open source references: www.thehealthedgepodcast.com