What fruit has the most calories?

Pineapple&Watermelon: have ~the highest glycemic index, thus most rapidly ↑blood glucose & store as fat, depending on how much eaten & many other internal human variables. Keep in mind, calories are a unit of heat, not a unit of mass; i.e. they have zero wt. Calories are measured by heating water in a calorimeter, not by eating. Calories in most food are not measured, only estimated from reference table.