Do you criticize what other people eat?

In my head I criticize for repeated unhealthy choices, particularly when the person has expressed the desire to become healthy. I've been there and I understand it so I don't have it in me to actually put anyone down for it, but at the same time I also know very well how irresponsible it is to abuse your body by feeding yourself junk all the time while knowing it's wrong and you'd rather be better.

I would like to offer help instead but I've wasted my time trying before so I don't go out of my way to offer it anymore unless I'm asked.