I don't think that is what they're going to monitor.
I think it will start innocuously, reminder to have your yearly checkup, time for you to get a flu shot (yea, mandatory at some point), and yes, are there firearms in the home, how many alcoholic beverages do you drink a day, ever taken an anti depressant, if you want surgery you'll vote for the right person.....

My opinion on the huge data gathering is not to punish those who prefer the couch-potato lifestyle, but rather, put "red flags" on those who maintain an active lifestyle by rejecting the food that the gov't says is good to eat, and by exercising regularly: these types of people could be a threat to the gov't, since they would be ones to lead any sort of rebellion. Why else would the gov't want to monitor what people eat, drink, do, etc?