How about milk and a little honey, then toss it in a blender for a smoothie?
The excessively pink, women's health sites I get when I google "grapefruit juice smoothie" suggest the following combinations:
-Grapefruit, papaya, mint and lime
-Grapefruit, strawberries, banana and mango
-Carrot, grapefruit, orange juice and ginger
-Grapefruit, coconut water, frozen strawberries and frozen raspberries
They sound good, but kind of hard as tits to make. Try leaving out an ingredient or two, I guess.
Here's some OC too, it's two kinds of food that I like to make. It's cheese-filled baguette with basil and a little garlic powder, and a pasta with chunks of eggplant and some parmesan. I do not eat healthy, and I think my vitamin supplements are keeping me alive.