The gene that influences how coffee affects you

If you always get jittery from having some coffee, it’s probably because you are a slow metaboliser of caffeine. — Filepic

Many of us look forward to that first cup of coffee in the morning to get us started and ready for the day, and there’s nothing wrong with that at all.

But as the day goes on, the caffeine starts adding up when we go for that second cup post-lunch, another during tea break, and perhaps one more after dinner.