In my experiments, if you don't have enough townies, the game has your regular sims visit the community lots over and over and over, all that lobster and drinking (possibly several times for every time your current playable is at the lot) makes your regular sims fat, very quickly.
Before I added new downtownies last night, some of my regular sims would be seen to arrive, eat food, have a drink, leave, exiting stage left and return entering stage right within 30 seconds and do it all over again.
When I checked them this morning, some of them were seriously obese, which they weren't when I added them to the game. Mind you, I suppose it doesn't help that they live on extremely minimal lots, in fact 3 of them have absolutely nothing on their lot.
MikeD
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