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I've mentioned this on HN before, but: calorie and nutrition intake monitoring.

Imagine an app that tells you how many calories you've consumed and the nutrition you've consumed in real time, with reasonable accuracy, without you having to manually input the food you've consumed. Like hands free MyFitnessPal. Couple that with what's already available in activity monitoring...

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I tried to figure out how make that some time ago - although my goto solution was cheap Indians rather than AI, but the problem boils down to the same thing anyone who has tried to diet this way finds: judging portions is really, really difficult. In matters a lot whether you put one or two teaspons of creamer in the coffee, and how much, if any, oil is over your salad.

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