"Eat a banana, it gives you potassium and energy!"
When people say things like this, I basically feel like killing them. Extreme, huh?
Fruit will not give you energy for a weight-training session, and it will not improve the benefits of a cardio session. It won't give you any feeling of energy at all. If you want potassium, there are foods with more potassium per calorie (low sodium, too). An example is a tomato, also many other vegetables that have less sugar than tomatos. Shit, you could make an ice/seaweed blender-shake and get potassium.
If you must eat fruit while cutting, you should eat something small and otherwise beneficial, like a guava. That has potassium, too. For pre-workout energy while cutting, my favorites are protein drinks, glycerine, ECA, plain caffeine (500mg), baking powder, speed stack, and definitely not bananas! If I want some form of nutritive energy during a workout, then MAYBE I will take some sugar, but I won't eat it, I will drink it.
Bananas are for monkeys.
I am in a shitty mood from work/school.