<human>: Give me the gist of the text in a nutshell

I mean, I understand why nutritional information is listed in caloric, fat, etc. content because those metrics are objective whereas weight gain would be subjective.  However, they already include subjective info, such as % of vitamins.  Is it just because the equation would be too complicated or too inaccurate?

I would think you would have to take into account the person's sex (so there would be male and female measurement), current age, current weight, average activity level, and maybe some sort of metabolism measurement.  On the box, it would use averages and maybe have a small grid or something.  Obviously, you usually only gain weight if you go over a threshold of calories...but I think that would be ok if you run under the assumption that the person has b/c that's a worse case scenario.

It seems like if you could take an abstract (to most people) concept of a calorie and convert it to something they can understand (weight) they would be less likely to eat that entire tub of ice cream.
<bot>: I'm lazy - why the hell not just tell me how fat I'm going to get when I eat your food?