As South Africans prepare for winter and a fifth wave of Covid-19, numerous studies have shown the antiviral effects of spirulina, with one study showing that it may help reduce severe Covid-19 risk, by 70%. Health expert, Vanessa Ascencao, chats to Leigh-Anne Williams about the benefits of spirulina, how we can refine our nutrition and lifestyle to boost our immunity as well as how one can break unhealthy habits such as eating too much sugar.