Yes, there is limited absorption of dopamine in the intestine and so food competes with the medication for absorption. Proteins in particular attach to the dopamine/ levodopamine. So that is the reason for no food for 60 minutes before taking those meds or take meds and wait 30 minutes before eating.

I have been told that you should take carbo/dopa at least 30 minutes before you eat or 1 hour after you eat. Protein is suppose to sometimes interfere with the medicine working properly.