"We" may take it seriously, but "we" don't take it effectively. There is a stronger social stigma in France against being fat, and it works, though I see a lot of young females smoking to maintain weight there. We have lists of Calories in food items that few bother to read or consider. That didn't work, I found food labeling to be useful. I was surprised how much salt was in many things like canned tomatoes. I've read some scary items about fructose, which is half of table sugar (and about half of HFC as well) and try and limit my sugar intake pretty hard. Alcohol is my weak spot, I like wine too much.
I say the five major food groups are salt, sugar, fat, caffeine, and alcohol. Just about any prepared food item in the US has a lot of 3 of those in it.
Salt sugar and fat are cheap ways to make cardboard taste good.