> Athletes consume 50g of fructose (and 50g of glucose) per hour
...while actively competing in endurance events. They don't do this while sitting on the couch in the evening. And it's very specifically only endurance trained athletes who do this, sprinters would never need to consume that much sugar.
It's a valid point though, a sugary snack or sports drink directly before hitting the gym for a hard workout session is probably fine, as long as your blood wasn't already saturated with glucose from earlier sugary foods, and as long as you don't have insulin resistance.
Sure, but that all has nothing to do with digestion, that has to do with blood sugar levels and what your body does with the energy afterwards. Digesting 30g of fructose per day is not any kind of biological limit, in contrast to what GGP claimed.