Further to what GG and Twinks have explained, I thought it would be useful to share with you the advice from Parkinson's UK contained in our Drug Treatments for Parkinson's booklet (https://www.parkinsons.org.uk/sites/default/files/drug_treatments_for_parkinsonssept2016_web.pdf). On the diet section on page 24 you can read:
"Taking levodopa with food can sometimes help to reduce feelings of sickness. However, for some people, protein (which is found mainly in meat, fish, eggs, cheese and beans) seems to interfere with the way levodopa medication works, by affecting how well the drug is absorbed by the body.
Your body needs protein, so it’s important not to stop eating it. However, some people may benefit from taking their medication at least 30 minutes before they eat. Your specialist or Parkinson’s nurse can advise you on timing your doses and this should be discussed with them when you are first prescribed the drug. They can also refer you to a dietitian."
Please note that this information refers to the controlled release (CR) or prolonged release version of the drug that comes in capsules or tablets, not the quick action dispersible tablets that GG mentioned or the intestinal gel that is pumped continuously through a tube into the intestine. You can find out more about these in the document linked above.
I hope you find that useful, but it is always a good idea to discuss any doubts about your individual treatment with your GP or Parkinson's nurse, or you can always give our helpline a call on 0808 800 0303 (open, as you know Monday-Friday: 9am-7pm and Saturday: 10am-2pm).