4. Grapefruits
If you want to lose weight, then grapefruit, the number 4 on our list of most popular, best selling fruits in the world, is a must-have fruit on your list of low-calorie food. Having a low glycemic index of only 25, it can hardly affect your insulin level. Sometimes it is enough to smell a grapefruit, and it will immediately decrease your appetite. Apart from dieting benefits, it can also resolve your indigestion problems, prevent dehydration thanks to its high percentage of water in it, reduce blood pressure and regulate insomnia. It’s a high time to drink that miraculous glass of grapefruit juice!