take aside any "health concerns" for a moment and think about how fatness is treated socially.
fat women report an above average amount of misogynistic comments and behaviour directed towards them in daily life, and of a higher degree of verbal violence (ie, r*pe threats etc.) compared to women as a population, and many report feeling they are treated as "not even human," because of how much society, but also to a fine point, men, treat women's worth as being equal to how "attractive" they are - and view fat women in turn as having "failed" at being women.
"oh, but i don't have anything against fat people, i just want them to be healthy!"
believe me that no fat person is unaware of your health concerns, as every and anybody seems to feel empowered to give their unsolicited opinions on that. but, that is a medical concern to be discussed with in confidence with a medical professional, not random strangers online.
if you contribute to the marginalization of fat people, women in particular, by pushing the narrative that demeans them and assumes qualities of laziness, ugliness, poor hygiene, etc., you are contributing to a pillar of patriarchy that equates a woman's value with her (subjective!) attractiveness and encourages her maltreatment accordingly.
women don't owe you shit, not "attractiveness," not femininity, not thinness, not a smile, nothing. let women exist as human beings without unsolicited criticism or analysis of their bodies, period.