You're mistaking active calories as the only calories you burn a day. There's a reason the caloric intake recommendation is ~2kcal/day, because your RMR (resting metabolic rate) is ~2kcal/day. Meaning if you were to literally sit in bed all day, you are "burning" ~2kcal/day. On top of that you have your incidental energy expenditure per day (TDEE), aka walking to the fridge, taking a shit, general locomotion, etc. You then have active calories burned on top of that. If you were to run a marathon, that means you would need to eat ~5kcal in one day to break even.

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tonymet 2 days ago | parent [-]

Yes I’m advocating eating less. It sounds like we agree with each other. What did I miss?

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rendaw a day ago | parent [-]

If someone would have eaten 3 meals for a sum of 2000 cal, with one being a 500 calorie meal, and they decide to switch that out with a 1600 calorie chipotle burrito, then the excess calories they need to burn are only 1100. Which a half marathon would more or less cover.

The situation you described only makes sense if they're eating 2000 calories worth of food during the day then adding an extra chipotle burrito.

Re: your 2nd marathon comment, if someone is eating two 800 calorie meals a day plus an extra 1600 calorie burrito, that comes out to 3200 calories. Minus the 2k resting expenditure, minus the 2k marathon expenditure, they're 800 calories short so they do need to consume more.

Is, I believe, the argument GP is making.

I don't disagree with you, I think the amount of exercise most people are capable of doing on a daily basis the extra calorie needs are insignificant. But I think your examples overstate the point.

	▲	tonymet 21 hours ago \| parent [-]
		we agree then that eating isn't necessary.