That's my take at least. During winter I'd probably have a more depressing perspective but the sun has been out lately.
However, almost all people I know that are over the top healthy (measuring everything, doing some sort of ‘du-jour’ diet (all meat, no meat, all protein, no protein, extreme fasting, no fasting; etc; ‘the best way to live’ changes more often than JavaScript frameworks), a lot of sports) are addicts to it or do it because they believe they will get a lot older than others (weird to me as many spend a of time doing stuff they don’t like; why would you want to lengthen your life in that case, but ok).
I'd hate to hear your winter perspective :)
The same way, people who have suffered a lot in the past might be now more happy than you are, maybe you’re objectively better but you might not perceive it that way, which is what matters in the end.