After a holiday in Italy recently, where she stayed with an Italian friend and her large extended family, a dd remarked on how slim they all were - and put it down to no snacking, None at all.
The meals were fairly simple but ample Italian style food, but nothing in between.
Given that so many people in the U.K. keep a constant supply of biscuits, cakes, crisps, etc. in the house, and help themselves often, I have to think she could well be right.
I don't know about anybody else, but I hardly ever buy cakes or biscuits - unless we have guests - because I know I'll just eat them! I am congenitally unable to leave a packet of Garibaldis or Fig Rolls alone, so they're a very rare treat.
Should add that I'm still far from my former size 10 - even after 2 babies - more like a 14 now, so even more reason to avoid the biscuit aisle.
(Dh and I do indulge in the odd bar of Fruit and Nut, though....)