does anyone know what is the best position to be in for digesting food/eating?

Seeing as how most people eat sitting down that would logically be the best position but i think the only reason we do that is because our mamas kept making us sit down instead of scampering around/under/over the table at macdonalds.
I think the best position would be standing up so you're insides arent all scrunched up or lying down on a 45 degree angled slope but I dont know alot about anatomy.

Also what position do you like to be in before/while/after eating. I think it's nice to slouch on my seat after a heavy meal.