Scientists say caffeine’s effects vary widely between individuals, with some people feeling alert or “buzzed” while others notice little change. Research points to a combination of personal habits and biology that influences how strongly the body responds to caffeine.
Outlets describe that caffeine response depends in part on how often and how much a person drinks coffee, tea or other caffeinated products. Lifestyle factors can also shape perceived effects, including sleep patterns and general diet. In addition, scientists highlight genetics as a major source of difference, noting that people process caffeine at different rates due to inherited biological variation.
While the reports share the same core message, they differ slightly in emphasis. Both frame the topic around habits, lifestyle and genes, but the coverage focuses more broadly on explaining why the same dose can produce different experiences from person to person. Overall, the accounts present caffeine sensitivity as a multifactor issue rather than a single explanation.
