Yeah I agree that the clothes number that was I think a dozen as the average in the 80s is more doable.
I was thinking that it may be a little like health and safety training - health and safety at work improves immediately after training but then declines over a period of time, so it has to be repeated at intervals
You're probably right about that. And if you think about it, real change comes from making habit changes one or a few at a time, not a whole-life overhaul all at once where you feel overwhelmed and like it's too hard and so you can't sustain it. Dieting is that way; people who are like THAT'S IT I'M THROWING OUT ALL THE JUNK FOOD AND BUYING MORE VEGETABLES THAN I CAN CONCEIVABLY EAT ...generally fall off the wagon and feel like it's impossible, but if you make a goal like "I'm going to do Meatless Mondays and limit myself to one soda per day instead of three" or whatever your goal may be, that's easier to maintain and make it a real lifestyle habit. Then once you've made it normal, then maybe you can add in something like, "now I'm going to try cooking a new recipe once a week" or whatever gets you closer to your healthy eating goals.