Absolutely. You can work with what you got, and stop blaming the world for what you weren't given (e.g. a face with no deformities, for me; I'm happy the picture with resume is not a done thing in Australia). Telling people to HTFU has never been popular, but that doesn't mean it can't apply to most anyone.
It might be small things like quitting alcohol, not using smart phones until the early hours every single night - so getting enough, better quality sleep. And getting a water carbonator with the money saved from the drink, thus improving your skin through better hydration. And squeezing some walks in here and there eg by parking further away, or taking the stairs, when before you wouldn't.
Taking hard personal responsibility for your own health, I'm sure most everyone could find something to improve on.
I have a long list still to go through for myself - but I've accepted that minor transgressions one day can be balanced out by being better the next few days. Thus one can achieve balance without going crazy.
For me Intermittent Fasting has been an incredible eye opener, and weight shredder. This included learning about nutrition. On this, DIY food box deliveries (eg Everyplate, the simpler/cheaper version of Hello Fresh) are extremely high value compared to eg Uber Eats deliveries - both nutritionally, and financially. It takes effort, of course - but that's part of HTFU.
Finally, going through a process of decluttering and cleaning my home after my separation - changing these habits have been very healthy for my mental state. Perhaps this goes twice for someone with ADHD, like myself. When I'm home now, I truly feel at peace; it's changed my attitude into a more positive one, which has improved my energy and clarity of thinking.
It's all about habits, and mental and physical health interconnect; maintaining both certainly takes discipline and effort. The effects are observable, though, and everyone judges everything all the time on an unconscious level. Fair or not - as biological beings that's just how it is.