Most prior studies confirm that people who eat a balanced diet have stronger immunity. The current study aimed to identify the effect of the diet history of COVID-19 patients recovered from occurring symptoms and their severity. The study sample consisted of 346 people aged 20–65 years. The study includes (personal data and an electronic questionnaire for getting diet history and the kinds of symptoms). Then the study focused on four hardness symptoms (fever, body pain, cough, and dyspnea) to find a relationship between them and some immunity foods. In this study, we can conclude that:-Intake of some functional foods slightly affected the reduction of symptoms occurring in compared with those who did not eat any of these foods by using averages of their percent, which was 88.1% suffered from symptoms in the case of no intake of these foods, compared with symptoms in cases of little and intensive intake, which were 85.54% and 85.55%, respectively.