i came to US from Ukraine in mid to late 90s and was shocked by how good all the food tasted compared to what i was used to.
everything in America tasted like the kind of cake i would only maybe get on my birthday if i was lucky. Americans were eating every day like it was their birthday.
luckily by the time i came to America i was already dieting despite being only a Teenager so i didn't really gain that much weight but only because i exercised daily and knew the importance of being hungry most of the time.
that said certainly it took a lot more effort not to get fat in America than in Ukraine because my sadist Jew father always bought cake and put it on the table knowing that i'm on a diet just to torture me. he wouldn't actually eat the cake himself - it would just sit on the table all the time to make me suffer.
