[dropofwill]

For cycling, sugar (really a mix of glucose and fructose, which sucrose or sugar is an even mix of) is a necessary component to a fueling strategy because even a marginally fit individual will burn more in an hour than can be processed by the glucose pathway alone. The goal isn’t to meet some daily allotment, but to get as much high GI carbs into the bloodstream as your gut can take, as fast as possible. This has been linked to higher performance and reduced fatigue in the literature, not to mention this is what 100% of pros do (there are no keto pros).

One benefit of this, like you say, is you develop a general disgust for sweets and have no interest in them outside of training.

[adrian_b]

You are right, but this is a very specific circumstance when the required power output is so high that it exceeds the capacity of the intestine for glucose absorption.

As you say, in order to achieve the maximum power output that can be sustained for a long time, i.e. in aerobic effort, you also need fructose, i.e. sugar, besides glucose, to reach the maximum rate of carbohydrate absorption in the intestine.

However the vast majority of the humans may never encounter during their entire lives a circumstance when they need to produce a sustained power output so high that it is limited by the intestinal absorption (and without an appropriate training their muscles would not be able to sustain so much power anyway), so they never need to eat sugar. They eat it only because it tastes good.