I live in the UK and was astounded at the sugar consumption when I visited the US.
The most interesting one was bread - it was so sweet, almost like cake, while our bread is just plan savoury bread.
There seems to be an OTT approach to added sweetness that I thought was bad in the UK but is next level in north America.
Another key difference was the milk in coffee shops. I went into Double cup and found some half and half (semi skimmed milk?) and dumped a bunch of it in my coffee. Nope literally half cream half milk. Blllerchhhh.