Interesting ideas! It does make sense that mobility scooters become normalised when obesity rates are high enough, and that the girls you encounter will already be using them.
I do plan to flesh out the obesity rate content, with alternative ways to boost the national rate & the chance to see the impact in an explorable London (which will be a playground for new tasks Dizzy's will set you in their plans for world fattification).
Changing character dialogue based on the obesity rate would be fun too, and may well be something I do in future!