I am 27 year old and grapefruits are my favorite fruit. Daily I eat around 2-3 grapefruit, but my mom always scold me that if i will eat grapefruit in this amount than i will gain extra weight. So can you please tell me that can someone put on weight due to grapefruits? I thought that all the fruits are beneficial and can never harm health. Can someone give me grapefruits calories content and other nutritional facts about it.