When you cough every time you eat it may be simply because the food is going down the wrong part of your throat and into your lungs.
Sometimes for some reason food goes through the wrong pipe in our throat and then gets into our lungs instead of the stomach.
The coughing can mean that it's trying to get the food up and away from the lungs and into your stomach.
Or when you're coughing when eating you could have other issues such as acid reflux, asthma, food allergies, and dysphagia, which refers to difficulty swallowing.
If you continue coughing when eating every time you should see a doctor about it and tell the doctor that every time you eat you cough.
They will test you for some health conditions which sometimes can be resolved.