In a bid to boost their performance Olympians, particularly athletes, include strange supplements in their diet.

While caffeine was once regulated under anti-doping rules, the restrictions were eventually lifted. As for many of us, even a low dose of caffeine can help improve alertness and "also improves a lot of other physiological parameters," Keith Barr, an exercise physiologist, told Inside Science.
According to studies, beetroot juice alone may improve performance by 2 to 3 percent in events lasting 20 to 30 minutes.
"For events lasting more than a minute and lasting up to several hours, it's a potentially performance- enhancing supplement," Michael Gleeson, an exercise biochemist at Loughborough University in Leicestershire, U.K., told Inside Science.
He added: "It essentially will improve endurance exercise performance by making you more efficient in the use of oxygen."
Source-ANI