Question: what to eat and not eat before donating plasma?
Answer: Drink 6 to 8 cups of water or juice the day before and day of your donation.
Eat a protein-rich, iron-rich meal no more than 3 hours before donating. ... 
Don't eat fatty foods like french fries, potato chips, pizza, or sweets the day you donate. ... 
Don't drink alcohol the night before and day of your donation.