What culture? The culture of eating better?
No, the culture of dieting (and yes I know they don't call it that, got many many teeshirts) being a multi million pound/dollar industry.
The culture of never thinking about anything other than eating.
And what everybody else has said on this comment
Ever try running around at 15 stone? Ever try going to soft play, swimming, tying your shoelaces?
Friggin I am pretty damn nearly 15 stone and quite short and I can do all of those things (e.g run a couple of miles most days, have just come back from Edinburgh where every fecking hill/flight of stairs goes upwards, NONE comes down!) without turning a hair. [smug bitch]
Laughs I think the considered responses (on both sides of the debate) prove that you are by no means overthinking this. Personally I have found SW to be a multiple waste of time but if you want to do it, my advice would be to leave her with someone or if that's impossible, do it online.