What are the evidences of glycolysis?

Hi guys!

Today I read that the human body can't assimilate proteins, lipids and carbohydrates, only simple sugars. Those affirmations sounds to me like pseukoscience. Here are my questions:

1.All the knowledge that is support by science has a strong evidence behind. I've tried to search the evidence that supports glucolysis and I am comfused about it. I don't know how discovered it and any experiment that prove the exitence of this pathway. Where should I search? Could you help me finding scientist studies that shows the existence of glycolysis?

2.What is the history of the glycolysis enzymes? How were discovered and who discovere them? Also, I need studies about the existence and fuctions of these enzymes.

3. How could I refute tehes hyphotesis?
THANKS!