@J That's often what I do. But I don't give a lot of advice, in fact I cringe when I have to.
What I like to do is, ask the person questions that have them thinking about what they haven't considered before. In many cases, they will see things differently if they're allowed to explore them in a unique way, and largely on their own.
I can shout at someone to not overeat. Or, I can ask them why they overeat, do they think overeating is good, do they want to stop.