If you eat the grapefruit in a dream, then it shows the stable mind you have. The dream could also symbolize fertility and sharp mind. You are the person with the strong views, who sticks to his morals. The dream in which you see the grapefruit tree indicates the fruits you will collect with your hard work. For women, the dream could also represent the children.
Read more about dreaming of Grapefruit in other dream meanings interpretations.