@luna69, This is a good question. Your dad will get dietary directions from his kidney team. If he is as lucky as I was, he will be happy - with fewer restrictions and able to enjoy eating again. As far as I know, there are no restrictions for the donor, however due to some discomfort and bowel issues for a short while, you might want to delay heavy/rich foods.

Several years ago, when @mauraacro was in the process of donating a kidney, she was most gracious to share her experience as it occurred - a live account. I am sharing a link to her journey and suggest that you read her account at the beginning of this (long and popular) discussion. As always, on Connect, you can join in and ask questions.
Just click this link and you will be taken directly to:
Kidney transplant - The Journey from the Donor's Side
https://connect.mayoclinic.org/discussion/kidney-transplant-from-the-donor-side/
Have you heard anything about a surgery date?