The Harvard School of Public Health published information on the role of diet and nutritional supplements during COVID-19. They examined the relationship between nutrition and immunity, and whether it is advisable for people to go on 'crash diets' during this time. They also explored the role of protein, carbohydrates, and fat for those infected with COVID-19, as well as which vitamins and minerals may help reduce respiratory infections. Finally, the publication discussed the importance of optimal nutrition for individuals with pre-existing conditions that weaken immunity.