I have also noticed myself and my partner gain weight when we live in the US. I'll make it a little more concerning: I mostly don't eat processed foods. I buy the raw ingredients and cook myself.
But when I say I cook from scratch I mean it. If I want beans I buy a bag of dried beans. I will sometimes buy canned Marzano tomatoes from Italy, ingredients: tomatoes.
And then there are the millions of cats with hyperthyroidism that has been connected to canned cat food.
And I generally buy in bulk at the outdoor market so relatively few beans even come in contact with the packaging.