[falcolas]

Counting calories is hard.

https://youtu.be/HGunZpKLb5o

TL;DW: Calculating the actual energy in a day's worth of well labeled foods resulted in a 500 calorie overage.

This doesn't even account for how your body absorbs calories different from every other body, and probably even differently every day.

[mahyarm]

Being perfectionistic about calorie counting is not necessary. It still works. The approximate measure is quite enough. And if you don't have the time to do it, just eating from chains that already do it for you works quite well.