Thanks for this. I am virulently opposed to healthism (obviously), and I appreciate that you don't explicity endorse it. That said, I still think your assertions contain a bit of implicit healthism, though likely intentionally.
Obesity, for instance, isn't intrinsically unhealthy. A growing body of literature demonstrates that when the relationship between weight and health outcomes is analyzed independent of confounding variables (namely, medical bias and weight stigma), there is no link between weight and health. That you frame the idea of fatness being unhealthy as common-sense knowledge (and compare it to drinking battery acid) reveals more about our socio-political landscape than it does anything else. We know that in countries where social welfare has been gutted (i.e. the UK, the US), politicians are most likely to advocate hard for 'healthy lifestyle choices' to shift responsibility away from neoliberalism and bad policy (see: Boris Johnson's sudden 'anti-obesity' crusade). I strongly suggest looking into fat liberation and fat activism movements on this.
When it comes to substance use, yes - within a week of beginning to drink, I'm consuming upwards of 40 ounces of vodka a day; within two weeks, I'm smoking crack, meth, down, and anything else I can get my hands on. Within a month, I'm on the precepice of death, am homeless, am hallucinating, etc. etc. This is clearly 'not healthy.' All that being said, benders for me are triggered by mounting pressure to sustain 'normalcy' in a world that is very much not designed to accommodate neurodivergence, CPTSD, etc. Sustained sobriety in our current context would literally a death sentence, so relative suicide, drinking and using are actually quite 'healthy.' This is where activism comes in, but until we collectively un-learn ableism (and all that comes with it), which will not happen in my lifetime, policies 'nudging' me toward 'health' (read: what is cost-effective for the medical system) are a slap in the face.
Tl;dnr: we need to constantly interrogate who benefits from our definitions of health, and which power structres they reproduce/sustain.
