I wonder if the macronutrient rates shifted. This would influence the total calories you end up with because absorption rates are different for different macronutrients. How the food is processed also influences absorption (as well as the total amount of calories that may not be reflected on the package).
If these factors changed, calories today don’t mean exactly the same thing as calories in 1970.
Since FDA allows a substantial margin of error for calories, maybe producers also developed a bias that allows them to stay within this margin of error but show fewer calories on the package?
Maybe this is all controlled for in studies, dunno, I just did a couple of google searches and had these questions.
I wonder if the macronutrient rates shifted. This would influence the total calories you end up with because absorption rates are different for different macronutrients. How the food is processed also influences absorption (as well as the total amount of calories that may not be reflected on the package).
If these factors changed, calories today don’t mean exactly the same thing as calories in 1970.
Since FDA allows a substantial margin of error for calories, maybe producers also developed a bias that allows them to stay within this margin of error but show fewer calories on the package?
Maybe this is all controlled for in studies, dunno, I just did a couple of google searches and had these questions.
I have no clue about this, unfortunately.