I was wondering how you could get such a high impact overall. But it seems one in 6 households are on GLP-1 drugs in the US.
In my friend circle in Germany I don't even know one single person on this stuff.
It's insane to me that so many people need these to get off the processed foods killing them in the US.
I imagine you'll find that people of certain lifestyles tend to cluster together a bit, with those with more active lifestyles and healthy diets likely to have their friends and family be of active lifestyles and healthy diets, and in turn less likely to be in need of such drugs. Lifestyle changes are difficult to implement by nature.
Although, the term "processed food" is awful as it covers so many unrelated things. The problem is ultra-addictive, ultra-high glycemic index foods consumed in large amounts partly due to their addictive qualities - a quality some processed foods have.
For reference, Danish sausage sandwich toppings are highly processed foods, but it won't drive anyone to obesity or diabetes. Elevated blood pressure, perhaps. Junk takeaway, candy and sugary cereals on the other hand...