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I guess that's why most people don't do bio-tracking: Not living a healthier life has long-term consequences which are abstract and non-tangible until you suffer from them.
It's even more stark than that: in most ways that matter, your brain considers future-you to essentially be an entirely separate person. Which is also philosophically interesting, bc now your own success, based on how 'nice' you are to future you, looks dependent on how thoughtful you generally are to other people.
Hmmm.
Bio-tracking makes at least the short-term of living healthier more tangible by comparing numbers. But long-term is still not tangible and abstract.
Another great aspect of where psychology comes into play -- a number moving, and the rate of its movement, has hedonic implications, even when the number itself is meaningless to you.