Product marketing has. And caffeine can do plenty of energy-like things for you – like making you more alert or focused and improving mood or cognitive performance.
"Caffeine can never make up for a poor night's sleep. The only thing that can make up for a poor night's sleep is more sleep," says, a gastroenterologist in New York City and an assistant clinical professor at Icahn School of Medicine at Mount Sinai. So, a friendly reminder: that energy drink might help get you through your afternoon hump – but caffeine can only block that tired feeling for a while.Caffeine is not one-size-fits-all. Learn what works for you
For her postdoctoral work, Cornelis studied the relationship between the human genome and our coffee and caffeine consumption – and what she found was that"If an individual was genetically predisposed to metabolize caffeine very quickly, we found that they tended to consume more caffeine," she says.