Caffeine's performance boost doesn't work for everyone

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The performance-boosting effects of caffeine are well documented, but it doesn’t work for everyone.

A group at the University of Toronto recently put 101 competitive male sportspeople through 10k bike time trials and compared their results based on what type they were for the CYP1A2 gene, which affects caffeine metabolism.

Medicine and Science in Sports and Exercise reported those with the AA genotype (49% of the test pool) improved their time by 4.8% on average after consuming caffeine, those with the AC type (43%) showed no significant change, while the CC group (8%) actually slowed by 13.7%.

So before you risk a dodgy race tummy with several last-minute lattes, test the effects in training first.