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4 hours of strenuous exercise. This should consume around 3000 kcals. Studies have found that humans cannot consume more calories than 2.5x their basal metabol

by oezi 4y ago

4 hours of strenuous exercise. This should consume around 3000 kcals. Studies have found that humans cannot consume more calories than 2.5x their basal metabolic rate.

tayo42 4y ago
You have to misinterpreting something. 2.5x is 4750 calories total. Athletes are eating more then that.
- oezi 4y ago
  The key insight is that you can eat more, but your body will not consume it. https://www.science.org/doi/10.1126/sciadv.aaw0341 https://www.science.org/doi/10.1126/sciadv.aaw0341 And nobody is saying you can't expend more energy for shorter times. It is just that you can't sustain it over long times because of our metabolic limits.
sasawpg 4y ago
During aerobic training, Nils van den Poel would average 33hrs/week (3x7hr, 2x6hr) roughly at 250W, which will be in the vicinity of 850-900kCal/hr depending on his body's efficiency, likely around 24-25%. That averages to 4250kCal/day when spread across the week. At his size and fitness level, he is probably in the 1800-2000kCal/day range for metabolic basal rate. He aimed for 7000kCal/day during aerobic training and gained 5kg during that summer on purpose. Math seems to add up to me.
petesergeant 4y ago
Do you have the source for this? I tried ChatGPT: >> Someone on the internet wrote "humans cannot consume more calories than 2.5x their basal metabolic rate" -- which study might they be quoting? > I am not aware of a specific study that states that humans cannot consume more calories than 2.5x their basal metabolic rate. Basal metabolic rate (BMR) is the amount of energy a person needs to maintain basic bodily functions such as breathing and digestion, and it can vary greatly depending on factors such as age, sex, and muscle mass. However, the total daily calorie needs of an individual also depend on their level of physical activity and other lifestyle factors. So, it's likely that this statement is a generalization or an over simplification.
- oezi 4y ago
  https://www.science.org/doi/10.1126/sciadv.aaw0341 https://www.science.org/doi/10.1126/sciadv.aaw0341 "Incorporating data from overfeeding studies, we find evidence for an alimentary energy supply limit in humans of ~2.5× BMR" A good book the topic is Herman Ponzer's "Burn" The main issue seems the surface area of the GI tract.
  - petesergeant 4y ago
    Fascinating, thank you. Apparently this means the most I can gain over Xmas week is 2.45kg, which is reassuring.

by oezi 4y ago

4 hours of strenuous exercise. This should consume around 3000 kcals. Studies have found that humans cannot consume more calories than 2.5x their basal metabolic rate.

tayo42 4y ago

You have to misinterpreting something. 2.5x is 4750 calories total. Athletes are eating more then that.

oezi 4y ago
The key insight is that you can eat more, but your body will not consume it. https://www.science.org/doi/10.1126/sciadv.aaw0341 https://www.science.org/doi/10.1126/sciadv.aaw0341 And nobody is saying you can't expend more energy for shorter times. It is just that you can't sustain it over long times because of our metabolic limits.

sasawpg 4y ago

During aerobic training, Nils van den Poel would average 33hrs/week (3x7hr, 2x6hr) roughly at 250W, which will be in the vicinity of 850-900kCal/hr depending on his body's efficiency, likely around 24-25%. That averages to 4250kCal/day when spread across the week. At his size and fitness level, he is probably in the 1800-2000kCal/day range for metabolic basal rate. He aimed for 7000kCal/day during aerobic training and gained 5kg during that summer on purpose. Math seems to add up to me.

petesergeant 4y ago

Do you have the source for this? I tried ChatGPT: >> Someone on the internet wrote "humans cannot consume more calories than 2.5x their basal metabolic rate" -- which study might they be quoting? > I am not aware of a specific study that states that humans cannot consume more calories than 2.5x their basal metabolic rate. Basal metabolic rate (BMR) is the amount of energy a person needs to maintain basic bodily functions such as breathing and digestion, and it can vary greatly depending on factors such as age, sex, and muscle mass. However, the total daily calorie needs of an individual also depend on their level of physical activity and other lifestyle factors. So, it's likely that this statement is a generalization or an over simplification.

oezi 4y ago
https://www.science.org/doi/10.1126/sciadv.aaw0341 https://www.science.org/doi/10.1126/sciadv.aaw0341 "Incorporating data from overfeeding studies, we find evidence for an alimentary energy supply limit in humans of ~2.5× BMR" A good book the topic is Herman Ponzer's "Burn" The main issue seems the surface area of the GI tract.
- petesergeant 4y ago
  Fascinating, thank you. Apparently this means the most I can gain over Xmas week is 2.45kg, which is reassuring.