BMI can be deceiving
One fun activity, if you haven't done so yet, is to cruise through the BMI Project initiated by Shapely Prose. After a while you stop seeing a body and judging it, you stop having automatic thoughts based on size, and you get to just enjoy humanity. With practice, you can go out into the street and extend that lack of judgement to the humans you encounter. You don't know squat about a person by evaluating their appearance, not even their BMI. You don't know their health or their eating habits or their morality - and you certainly don't know their mental health.