Hello, I can say, I have been concerned about not eating or drinking enough. I am 5 days post op, vertical sleeve. I kept down 3/4 of a skinny cow fudgecicle, 1/4 cup potato soup, puréed and watered down, and 2 16 oz glasses of Gatorade. That was through the whole day. That should answer your question. Feeling better each day.