For ML practitioners, how much more/less difficult is this than predicting calorie content/macros from pictures/video of food? Because that seems like the holy grail of “calorie counting” apps, to seamlessly track (within a small margin of error) what your macros for the day are so far, thus helping you make intelligent choices about what to eat & portion size. Especially since those apps are great for sticking to diets, if it weren’t for all the mind-numbing data entry.