In a recent study, researchers found that individuals who regularly consume large quantities of caffeinated beverages report lower levels of fatigue compared to those who do not consume these beverages. However, the researchers also noted that excessive consumption of caffeine can lead to increased anxiety and restlessness in some individuals. Based on these findings, they recommend that moderate caffeine consumption is beneficial for energy levels, but excessive intake should be avoided to maintain overall well-being.

From the researchers' analysis, which of the following best describes their method of reasoning?