I often wonder if there is enough data to do that but I don't have a medical background so I wouldn't know how. Part of the dataset is my output from 23 and Me, as well as my steps, heart rate, weight, BMI, and caloric intake. I'd love to gather more but blood pressure, blood sugar, body temperature, and the like are semi-invasive to gather and I avoid gathering data I need to do daily manual work for.
The only exceptions I make are weight lifted and repetitions when working out and only because I haven't found a good way to do it and it... I've been playing with Arduinos and accelerometers and measurements (waist, chest, thighs, etc) which I only do once a month.
So in theory it is possible.
But in any case, per your motivation behind the question. I avoid devices that report data to a central server so advertisers using it would be hard pressed, but not all consumers are as careful. I can't avoid it entirely without making my own hardware. For example my Fitbit data goes to Fitbit, my treadmill data goes to iFit, and 23 and Me has my DNA sequence. But I think you'd need all the pieces to it all together and there is no third party that has them all.
The only exceptions I make are weight lifted and repetitions when working out and only because I haven't found a good way to do it and it... I've been playing with Arduinos and accelerometers and measurements (waist, chest, thighs, etc) which I only do once a month.
So in theory it is possible.
But in any case, per your motivation behind the question. I avoid devices that report data to a central server so advertisers using it would be hard pressed, but not all consumers are as careful. I can't avoid it entirely without making my own hardware. For example my Fitbit data goes to Fitbit, my treadmill data goes to iFit, and 23 and Me has my DNA sequence. But I think you'd need all the pieces to it all together and there is no third party that has them all.