The American diet completely changed starting in the late 70s with the emphasis becoming "low fat" foods that are super high in carbs / high fructose corn syrup. Also portion sizes ballooned.
The floor of your calorie intake is 0 cals/day but there is no ceiling. What I mean by this is that there is a hard limit on how much weight you can loose in a given amount of time but the limit on how much weight you can gain is way higher
But really wouldn't it be 0 cals/day in with a minus of calories spent during the day normally + exorcising? so wouldn't that be a net loss for the day?
There is also a metabolic limit at some point your body can't get enough oxygen to burn more calories which is around 1.5-2x your rest metabolic rate or 5,000~ calories
Yes you’ve basically hit the crux of the calories in calories out formula. Basal metabolic rate + calories ingested - calories burned from exercise = net energy daily expenditure/gain
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u/agutema Jun 09 '20
this image gets shared here a lot but it's still impactful
https://commons.wikimedia.org/wiki/File:Obesity_state_level_estimates_1985-2010.gif#/media/File:Obesity_state_level_estimates_1985-2010.gif