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I'm pretty sure someone has just released something like this. A handheld scanner that will tell you the calories/macros for your plate of food.

It was a one off cost of circa £150, then £15 or so a month ongoing.

Apologies but can't be arsed to find the link on mobile.

Was it this miniature near-infrared spectrometer?

> The SCiO, a handheld "pocket molecular sensor" available now on Kickstarter, gives you the data on your food.

Also found this plate with 3 scales and cameras that uses object recognition algorithms to identify food:

> This Smart Plate Tells You How Many Calories You're Eating—And Whether You're Eating Too Fast

> The ultimate in portion control: a plate that yells at you.