I agree that I really need to write a post on this (and a half-dozen other nutrition-related things that I’ve become known for saying in person and in comments, but haven’t written up properly).
For this specific point—about 2000 calories per day being a shortfall—it’s fairly straightforward. There’s a scientific-consensus answer to how many calories people typically need, the Harris-Benedict formula. (This has a few variations with slightly different constants, all of which trace back to linear-regressions on measured energy expenditure.) I typed in my own parameters, and those of a few other people, and observed that, within the demographics of people I know, ie mostly youngish male and with a height reflective of decent childhood nutrition, it was consistently well above 2000. I also traced the history of where the 2000 number used on nutrition facts panels came from, and found that it was never intended as any sort of recommendation, and seemed to have been misinterpreted as one by historical accident. I try to always include a link to the formula or a calculator for it, when I talk about calorie intakes, so that people can get the real number for themselves.
There’s a scientific-consensus answer to how many calories people typically need, the Harris-Benedict formula.
Out of interest, I checked wikipedia, which gives three different equations (Harris-Benedict, Mifflin St Jeor, and Katch-McArdle), saying “Historically, the most notable formula was the Harris–Benedict equation”.
I just put in my details on them, and my daily caloric burn varied over 1000 calories (one was 500 less than the other which was 500 less than the other). One of them was pretty close to 2000. /shrug
I agree that I really need to write a post on this (and a half-dozen other nutrition-related things that I’ve become known for saying in person and in comments, but haven’t written up properly).
For this specific point—about 2000 calories per day being a shortfall—it’s fairly straightforward. There’s a scientific-consensus answer to how many calories people typically need, the Harris-Benedict formula. (This has a few variations with slightly different constants, all of which trace back to linear-regressions on measured energy expenditure.) I typed in my own parameters, and those of a few other people, and observed that, within the demographics of people I know, ie mostly youngish male and with a height reflective of decent childhood nutrition, it was consistently well above 2000. I also traced the history of where the 2000 number used on nutrition facts panels came from, and found that it was never intended as any sort of recommendation, and seemed to have been misinterpreted as one by historical accident. I try to always include a link to the formula or a calculator for it, when I talk about calorie intakes, so that people can get the real number for themselves.
Thx for the comment.
Out of interest, I checked wikipedia, which gives three different equations (Harris-Benedict, Mifflin St Jeor, and Katch-McArdle), saying “Historically, the most notable formula was the Harris–Benedict equation”.
I just put in my details on them, and my daily caloric burn varied over 1000 calories (one was 500 less than the other which was 500 less than the other). One of them was pretty close to 2000. /shrug