Every time you have a carrot instead of a cookie, every time you go to the gym instead of going to the movies, that's a costly investment in your health. But how much you want to invest is going to depend on how much longer you expect to live in the future, even if you don't make those investments.
This is the solstice, the still point of the sun, its cusp and midnight, the year's threshold and unlocking, where the past lets go of and becomes the future; the place of caught breath.