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Where do the calories to burn come from in those cases? If I consume 1500 calories per day and burn 2500, where does the other 1000 calories come from if not fr
by gaadd33 13y ago
Where do the calories to burn come from in those cases? If I consume 1500 calories per day and burn 2500, where does the other 1000 calories come from if not from fat stores? I guess at extreme caloric deficit the body would start breaking down muscles but that would still cause weight loss.
Any chance you can link to some of the research that shows where the rest of the energy comes from?
- runako 13y ago>> If I consume 1500 calories per day and burn 2500 I think the key insight is that the body is a complex, dynamic system. So the exercise required to burn 2500 calories will vary between individuals, and even for a single individual based on any number of factors. I won't profess to have all the answers here, but I don't think it's as simple as X calories per mile x Y miles = 2500 calories, where X comes from a table on the Internet. I think it's more of f(X) calories per mile, where f is a compound function that includes the composition & fluctuations of your gut biome and its effect on your metabolic rate. My foggy memories of the research are that in practice, solving f in the real world is quite difficult. So while your calorie deficit theory works, in practice unless you're precisely measuring your compound (i.e. you plus your gut flora) metabolic rate in a lab, you don't actually have a way to know how many calories you're burning.