Define common.
Obesity is very common.
Morbid obesity is becoming more so.
Hard to get reliable stats, but I’ve see anywhere from 12% to over 30% for morbid obesity in adult American females.
That’s, as I said, a very large market.
Men are also much heavier now than a few decades ago.
Once in a while there will be a picture of a news event with people at a gathering in a crowd outside. Old pictures might have one or two large people here and there but most are within a few pounds of normal weight.
New ones have a significant number of heavy men and women. Oddities are slender ones now.
I’m sure those marching crowds in the Wegovy and other ads didn’t require lots of searching by the casting director.