Several people tend to go on a fruit diet for a few days, weeks or a month to loss weight or get healthy. The fact that you are on a diet would come with a suffering element attached to it. To ease the pains of the diet you should buy yourself some tasty fruits to try out while you are at it.
There is no best fruit for diet really. All fruits are great, they are all rich in water content, glucose, minerals, vitamins and essential amino acids. What we can talk about here would be the right combination of fruits which would ensure you don't feel gagged by the excessive sweetness.
Some fruit combinations which work great are
A mix and match of citrus with sweet fruits tend to work well. Your taste buds are perverted through the excessive spicy and salted foods you are used to, so the addiction to eat cooked food would spring up from time to time. It is best to eat citrus fruits when you feel gagged by excessive sweetness of melons, bananas and mangoes.