I'm glad you like the obesity rate stuff! I'll be adding a lot more in this vein when I add London as an explorable area. That update will include Dizzy's missions to fatten up target politicians, journalists, anti-obesity activists, etc., who are making life difficult for them. You'll also see the impact of the national rate in London.
Although I probably won't make it possible to date Christina or Isabel (they're actually both characters from one of my weight gain stories), I'll definitely add the ability to date (and fatten) similar politicians fretting about how fat the UK is getting!