It depends on what the craniotomy is for. If the operation is for tumor, it is not recommended to eat fish and other foods in the near future, because the acidity of tumor patients is very high, cancer cells are very acidophilic, and they will grow rapidly in acidic constitution, while fish and other foods are very acidic. Eating more alkaline food is very beneficial to inhibit cancer cells.

Strongly acidic food: egg yolk, cheese, dessert, sugar, tuna, flounder.

Acidic food: ham, bacon, chicken, pork, eel, beef, bread and wheat.

Weakly acidic food: white rice, peanuts, beer, laver, octopus, chocolate, hollow powder, onion.

Strongly alkaline foods: grapes, tea, wine, kelp, oranges, persimmons, cucumbers and carrots.

Moderately alkaline foods: soybeans, tomatoes, bananas, strawberries, protein, prunes, lemons, spinach, etc.

Weak alkaline food: red beans, apples, Chinese cabbage, tofu, cabbage, rape, pears, potatoes.

It doesn't matter if you have craniotomy for other reasons.

Because now due to environmental and other reasons, the human body is acidic, and eating more alkaline food at ordinary times is also good for the body. I hope I can help you.