Researchers at the University of Nevada-Reno have discovered that used coffee grounds can be transformed into biodiesel, meaning one day cars could run on fuel that smells like cappuccino. But while coffee may fuel vehicles in the future, doctors warn that your first morning cup might not be the healthiest way to fuel yourself.

Health experts suggest delaying coffee until mid- to late-morning, ideally between 9:30 a.m. and 11:30 a.m. That’s because drinking it immediately after waking can backfire. On an empty stomach, caffeine spikes stress hormones, and when paired with sugar, it can lead to sharp blood glucose crashes that make you feel more tired.

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