Do you make your child finish his or her dinner before leaving the table?

I have a two year old son and at this point I allow him to eat as much as he wants and then go. Sometimes his dinner consists of a few bites and then I'll give him other small things like greek yogurt and homemade applesauce. With the growing rate of obesity I feel like I should allow him to decide when he's finished instead of forcing him to finish. My family doctor advised that what I'm doing is perfectly fine and that especially at this age he will eat when he's hungry and he will eat as much as his body needs. What do you guys do? What do think?