Mixed isotonic sports drinks generally contain 40 to 80 g of carbohydrates per liter, which is the same osmolarity as body fluids and can be an effective way to hydrate.
Djokovic, the most high-profile athlete to openly refuse Covid-19 vaccination, also often eats dates mid-game to keep his energy levels up. The Serb is so obsessed with diets that he has said he only allows himself a piece of chocolate after he wins.
Four years ago, the 35-year-old switched to a gluten-free diet, saying it helped him become a “different man” within 18 months. “My life changed because I started eating the right foods for my body, in the way my body required,” he said. Djokovic’s diet is based on vegetables, beans, white meat, fish, fruits, nuts, seeds, chickpeas, lentils and healthy oils.