The article explains that while caffeine can boost alertness, excessive consumption, especially from drinks like Celsius, may lead to brain fog due to its interference with sleep and potential to cause over-reliance. One point you could expand on is the act of caffeine consumption and how it can disrupt sleep, which worsens fatigue, prompting more caffeine use. I would say that a helpful addition would be to emphasize the importance of understanding individual caffeine intake tolerance, making it harder to generalize its effects on brain fog and fatigue.