An American scientist continues to threaten diplomatic relations with Britain due to her controversial suggestions of what to put in your tea.
Michelle Francl, a professor of chemistry at Bryn Mawr College in Pennsylvania, says the addition of grapefruit can keep caffeine in the body for longer.
The expert – who already suggested adding salt to tea – claims grapefruit can prolong the effect of caffeine and keep you feeling awake for longer.
While this sounds sacrilegious to the majority