I don't think this falls in the discipline catergory...but I don't know that it should, afterall who want's to forever associate food and eating, actual sustanence and nourishment our bodies need with fractured memories of having been disciplined and it's unpleasentness.
With that in mind I wonder if you shouldn't try taking clues from him. Instead of 'serving him at mealtime straped into his throne' place a plate of healthy finger foods that will keep all day on the coffee table or on a snack tray where it is convienent for the two of you and most present in and amongst your daily routine (I know I don't really have one either) but basically where he will be sure to see it and easily access it without disturbing his natural rhythm. Point it out when you first put it out, breakfast and whenever you eat. He'll eat I swear maybe not much but really they honestly don't need much at all, but after a few days he'll devour it, especially if his independance is slyly pointed out by you (after he really takes to this.
Let him be your guide make special mote of when it is he eats most often and the largest portions. See if you notice a trend, after a few weeks move the plate to the kitchen table ensure he's still w/ the program and after a few days only put out on the kitchen table the 3 specific "meals" and the 2 or 3 "snacks" you would prefer he eat, at around the same times throughout the day you noted him eating with the best appetite.
Then set a place at the table get a high chair that straps into a chair or one that hooks onto the table put his food out with yours he'll have to ask for help to get to his food and when he does strap that lil' guy in let him eat or not eat, get down if he chooses, but don't let him eat unless he sits with the family or rather is going along with the desired mealtime routine or preferred snack consuming time and place. He may go to bed hungrybut when he wakes up with hunger pains, feed him but only in the same manner you expect during your normal day. Doubt it will ever come to this...he will have already learned the routine and his tummy will have grown accustomed to being filled at these times, so he'll eat if he's hungry, trust me...he will eat.
Chances are it's just a growth thing the ebb and tide you know???
That you could do nothing and in 3 weeks you'd have a power eater on your hands...they're just like that.
If he doesn't eat as I have promised you he would do eventualy do, and o mean no intake, or his normal disposition isno longer the norm, hisplsy isn't as spirited, his sleep & bathroom habits seem out of whack, his general
self goes missing or seems dry, then you need to see your pediatrician, there may be something biologicaly upset, which no advice, allowing for time, or discipline can fix, and intervening medically is not only now your best shot at treating your son, it would at this point most definitely pertinate, however I doubt this is the case :)
I hope you've garnered some good advice and are able to reap the rewards. Good luck and relax :)
noted him eating best