If you work or have worked in a grocery store, have you noticed trends in what people put in their basket and the way they look?

I was just thinking about the change in my shopping habits since I changed to a healthier lifestyle. I sometimes feel proud to go through the line with a basket full of fruits and vegetables and think about how my basket probably has ¼ or less the calories it used to.
It makes me wonder what assumptions grocery clerks can make about people based on what they see in their grocery carts. Especially repeat customers when they see habits forming.