Does coffee really lower heart disease and dementia risk and improve sports performance? And how much caffeine is too much?

The fact that coffee makes you sharper, more alert and more energetic is due to the caffeine it contains. 'Caffeine ensures that our nervous system is stimulated, which benefits our concentration and alertness,' explains GP and sports doctor Tom Teulingkx.

You will feel this effect after about 40 minutes, when the body has completely absorbed this substance.

Read at Independent