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Do people who burn 3500 calories weigh one pound less? Are you sure? (that belief is mainly based on an old study where fat was removed from a body and combust
by dekhn 3y ago
Do people who burn 3500 calories weigh one pound less? Are you sure? (that belief is mainly based on an old study where fat was removed from a body and combusted). It's been observed, with newer more accurate measures, that fat burning doesn't correlate perfectly with weight loss.
From what I can tell, weight changes happen only partly due to CO2 exchange and partly due to rates of consumption and excretion.
The biophysical origin (I'm a biophysicist) of weight change as a function of energy use, eating and excretion is a bit more complicated than that.
- devmor 3y agoGive or take, yes. Like you said, it’s a bit more complicated than that and every body is different. But burning roughly 3500 calories will result in the body weighing roughly 1lb less (accounting for food and water intake and loss). If it didn’t work this way, every bodybuilder and fitness enthusiast on the planet would have a very different approach to their diet.
- mock-possum 3y agoSo wait if I fasted for two days, could I responsibly expect to come out the other side one pound lighter? That’d be a roughly 3600 calorie deficit.
- devmor 3y agoYes.
- insanitybit 3y agoAssuming that they burned purely fat for energy, what else could it be? Are you saying that it's not just fat being burned, or that 'burning' the fat is not going from '1' to '0' in terms of weight?