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flag Drinking coffee before 9 a.m. may boost alertness and metabolism, according to a new study.

flag A new study published on March 22, 2026, suggests that drinking coffee before 9 a.m. may improve alertness and metabolic health, prompting health experts to recommend adhering to a strict 9 a.m. cutoff for optimal benefits. flag The research, based on data from over 10,000 participants, found that those who consumed caffeine after 9 a.m. experienced disrupted sleep patterns and reduced insulin sensitivity. flag Experts caution that individual responses may vary, but the findings reinforce timing as a key factor in caffeine’s effects.

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