Is it not the responsibility of the doctor prescribing or the very least the person who is taking the medication to be aware? They put warnings on all medicatio

Is it not the responsibility of the doctor prescribing or the very least the person who is taking the medication to be aware? They put warnings on all medication that has interactions with grapefruit, because they don't want to check a piece of paper on their prescription or mention to their doctor of their diet. It's your body, your health ultimately, in hand with the doctors support. How would you even mark fresh fruit? Force supermarkets, farmers, why stop there?