Why does your heart rate go up after eating?

Your heart rate should increase after eating, although it should not become uncomfortable. The reason it increases is because the body is working to digest the food you just ate and transfer it to energy. The blood is rushing to your stomach and other organs needed to digest your food and your heart must therefore pump faster. It's normal. If it increases beyond 100-110, consult your doctor. You may have an accelerated heart rate, which is not good, but can be treated with beta blockers.