Could give a rant about appetite suppresants but won't.

I believe in learning to work with your body, not con it. You want it to know you'll listen when it sends you signals. Ignoring signals leads to bigger problems later on.

Eat a bigger breakfast, with more fat, or a bigger lunch, if you're hungry too soon in the afternoon. For me, a 3 pm hunger would indicate too much carb because, again for me only, hunger at that time of day is an insulin/blood sugar problem. YMMV.

Or why not eat a real dinner at 3?