I didn't care about taking care of myself until I realized I was an overweight adult with bad teeth. I had the metabolism of a lab mouse until roughly the age of 23 and could drink plenty of beer and eat a cornucopia of junk while remaining quite thin. A few years later getting to a point where I don't feel like crap is hard work. Going to the trouble of taking care of myself didn't really affect how I generally felt until I was well into adulthood and thus was put on the back burner. I also served a few years in the military, where a standard of appearance was strictly enforced.