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It is not how it works at all. The fallacy here is that a human body is a machine with well-defined intake and output. How would one even know what is "exactl

It is not how it works at all. The fallacy here is that a human body is a machine with well-defined intake and output. How would one even know what is "exactly" the right amount? Over a year we consume 1 million calories. If one were just 0.1% off of systematically eating more (or less) than required then according to your model one would end up being 200 pounds fatter or 200 pounds leaner ... do you think that anyone can regulate up to 0.1% accuracy to what they actually need? eating a little more or less has absolutely not discernible effect the body adapts to it.

JoshuaDavid 7y ago
0.1% of 1 million calories is 1000 calories, which corresponds to about 0.3 pounds. If someone gains or loses 10 pounds in a year, that means they were around 35000 calories away from equilibrium throughout the year, which is more like 3-5%. So a 5% calorie deficit or surplus would have a fairly small effect during a single year, but over a decade or a lifetime the effect is huge.
- glofish 7y ago
  oops, I sure got my digits wrong
monadgonad 7y ago
It is exactly how it works, and you're taking "a small percentage" to a ridiculous degree to fallaciously disprove it. Try eating 10% more or less than what you need each day, not 0.1%.
NightlyDev 7y ago
1 billion* 2 - 2.5 million calories a day is normal for people with a normal level of physical activity.
- ac29 7y ago
  In the US, we tend to use food calories, where 1 Calorie == 1 kilocalorie. The capitalization of Calorie is intended to show the difference in units, but in most written language, often isn't used.
jobseeker990 7y ago
Another question to pile onto this. Maybe you're the right one to ask. I was always taught that the body uses up its glycogen stores before burning fat. But if that were true even a small calorie deficit would gradually use up our glycogen stores and we'd be walking around without any after that. Plus before losing any fat you'd have to experience a glycogen crash/wall which most small deficit dieters don't experience.
- sidamo 7y ago
  Very roughly... Generally what fuel your body burns depends on the intensity of work you are doing, so if you're walking you may be burning 80%+ fat, but if you're running a 10k you may be 80% glycogen. However, if you eat too many carbs at a meal (beyond what you need in the next few hours), your body needs to get that excess out of your bloodstream, so it will do a combination of: - fill your muscle/liver glycogen stores (limited size) - burn any excess carbs in preferences to stored fat - convert any excess carbs to stored fat Once it's got rid of the excess carbs from your bloodstream, it will return to burning whatever the normal ratio of fat:carbs is for you. Consequently, if you always eat too much carbs, you'll gradually pile on the fat, unless you're doing large amounts of training which depletes your muscle/liver glycogen, e.g: elite athletes.
loco5niner 7y ago
Actually, that IS how it works. It may not be possible to know or calculate the exact intake and output values, but those values are not needed. Your body gives you cues. > eating a little more or less has absolutely not discernible effect the body adapts to it. Yes, the body adapts to it by storing or eliminating fat (among other things).
- ccanassa 7y ago
  No, if that was true people would be always over or under the weight as it's impossible to know exactly how much calories the body consumes. > Yes, the body adapts to it by storing or eliminating fat (among other things). No, it compensates by changing your metabolic rate mostly. You eat less, you will feel more lethargic, you eat more and you will fill (and be) more active

JoshuaDavid 7y ago

0.1% of 1 million calories is 1000 calories, which corresponds to about 0.3 pounds. If someone gains or loses 10 pounds in a year, that means they were around 35000 calories away from equilibrium throughout the year, which is more like 3-5%. So a 5% calorie deficit or surplus would have a fairly small effect during a single year, but over a decade or a lifetime the effect is huge.

glofish 7y ago
oops, I sure got my digits wrong

monadgonad 7y ago

It is exactly how it works, and you're taking "a small percentage" to a ridiculous degree to fallaciously disprove it. Try eating 10% more or less than what you need each day, not 0.1%.

NightlyDev 7y ago

1 billion* 2 - 2.5 million calories a day is normal for people with a normal level of physical activity.

ac29 7y ago
In the US, we tend to use food calories, where 1 Calorie == 1 kilocalorie. The capitalization of Calorie is intended to show the difference in units, but in most written language, often isn't used.

jobseeker990 7y ago

Another question to pile onto this. Maybe you're the right one to ask. I was always taught that the body uses up its glycogen stores before burning fat. But if that were true even a small calorie deficit would gradually use up our glycogen stores and we'd be walking around without any after that. Plus before losing any fat you'd have to experience a glycogen crash/wall which most small deficit dieters don't experience.

sidamo 7y ago
Very roughly... Generally what fuel your body burns depends on the intensity of work you are doing, so if you're walking you may be burning 80%+ fat, but if you're running a 10k you may be 80% glycogen. However, if you eat too many carbs at a meal (beyond what you need in the next few hours), your body needs to get that excess out of your bloodstream, so it will do a combination of: - fill your muscle/liver glycogen stores (limited size) - burn any excess carbs in preferences to stored fat - convert any excess carbs to stored fat Once it's got rid of the excess carbs from your bloodstream, it will return to burning whatever the normal ratio of fat:carbs is for you. Consequently, if you always eat too much carbs, you'll gradually pile on the fat, unless you're doing large amounts of training which depletes your muscle/liver glycogen, e.g: elite athletes.

loco5niner 7y ago

Actually, that IS how it works. It may not be possible to know or calculate the exact intake and output values, but those values are not needed. Your body gives you cues. > eating a little more or less has absolutely not discernible effect the body adapts to it. Yes, the body adapts to it by storing or eliminating fat (among other things).

ccanassa 7y ago
No, if that was true people would be always over or under the weight as it's impossible to know exactly how much calories the body consumes. > Yes, the body adapts to it by storing or eliminating fat (among other things). No, it compensates by changing your metabolic rate mostly. You eat less, you will feel more lethargic, you eat more and you will fill (and be) more active