Why caffeine is not a consistent performance aid for all recreational athletes?

I recently did an ancestry gene test and discovered that I'm in the 50% of the population who are slow caffeine metabolisers (CYP1A2 AC and CC genotype). I was a little curious to find out what this means and what positive or negative effects caffeine can have on our health and performance?

Numerous studies have linked caffeine with positive health effects like reduced risk of obesity, diabetes, and heart disease. However, recent research suggests that the effects of coffee on health aren’t the same for everyone, and may depend on genetics and other factors.

I love coffee—and I know I’m not alone.