But on the low-fat diet, people lost more fat, “despite not changing insulin one bit,” Hall says. What they did find was that cutting 800 calories of fat resulted in the body burning just as much fat as before. Bix One of the beer study's authors is on the organizing committee of the 7th European Beer & Health Symposium: Beer and Health.
Fanatic Cook by Bix is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. We selectively restricted dietary carbohydrate versus fat for 6 days following a 5-day baseline diet in 19 adults with obesity confined to a metabolic ward where they exercised daily.
In contrast, on a low-carb diet, metabolism changes: insulin levels went, carb-burning went down and fat-burning went up, but only by about 400 calories a day, Hall says. Subjects received both isocaloric diets in random order during each of two inpatient stays.
That means that low-carb dieters had a net deficit of about 400 calories per day—but those on the low-fat diet had a net deficit of about 800 calories per day, resulting in slightly less body fat.
Body fat loss was calculated as the difference between daily fat intake and net fat oxidation measured while residing in a metabolic chamber.
As expected — and in keeping with the theory about carb-cutting — insulin levels went down and fat burning went up. This surprised him; Hall thought that the body would somehow respond to the reduction in fat, but it didn’t.
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