Isabella was enrolled in university to get a degree in biomedical science but instead of studying, she spent every night out partying with her friends.

One night, she got all dressed up and ready to go, only to find that her roommate Stephanie was not dressed and was sitting in a pile of books instead, reading!

“Let’s go out to that new bar,” she said to Stephanie.

“What?” Stephanie exclaimed.
“Don’t you realise we have our final exam in 2 days?
No, I have to study. Isabella, you should too!”

“Oh well,” she said. “You will miss out on all the fun. And I can study tomorrow. I still have one more day.”

Isabella went out and had a great time, the new bar was really something.

The next day.
She sat down with her books. Being a bit hungover, she had some special items to keep her awake:

1 large can of energy drink
1 espresso coffee
1 bottle of Coke
And a big bar of chocolate
She started to study but not much was going in.
After she had ate and drank all her snacks, she realised that she had ingested TOO much caffeine. Isabella felt sick and hyped-up, so much that she could not concentrate on her studies at all even though she was awake.

While her roommate Stephanie who had been studying a little bit every day got perfect marks, Isabella failed terribly.