If you want the best results… Then you need the best of both worlds!
You need the right nutrition to fuel your training, whilst cutting down on “Empty Calories” which provide no nutritional goodness (Added Sugars etc.)
Simple Sugars can be beneficial when it comes to post training/competition, when an individual needs to quickly up their blood sugar levels / replenish glycogen stores… But as a a whole we want to cut these out as much as we can.