How come sometimes when you eat, it can hurt your chest a little?

To much unhealthy ingredients?

It could be acid reflux or heartburn. When you eat food it travels down your throat (the esophagus) and towards your stomach where a special muscle (sphincter) helps slow down the food, let's it enter the stomach, then closes. If the sphincter doesn't close all the way or weakens it can let stomach acid into the esophagus, which causes pain in your chest. Happens to me all the time. Take a Tums or another anti-heartburn medicine to help with the pain.

Sometimes my chest hurts when I eat something