The Covid-19 pandemic has caused various problems, one of which is mental health problems. Unmantained mental health can cause a decrease in the immune system and can facilitate the transmission of Covid-19. One way to increase immunity is to eat a balanced diet containing the healthy nutrients. Therefore, it is necessary to educate the public to maintain mental health and increase immunity through the fulfillment of nutrition to reduce the spread of the Covid-19 virus. Evaluation were conducted at the beginning and at the end in the form of a quiz. Then the quiz results were analyzed descriptively and comparatively using the Wilcoxon method. 228 participants who took part in webinar activities with subtopics on mental health experienced an increase in knowledge from before participating in this activity with a percentage of 46.7%, and 234 participants experienced an increase in knowledge from before participating in the webinar activity with a subtopic of increasing body immunity through nutritional fulfillment with a percentage of 47.9%. The Wilcoxon test showed that there was a significant increase in knowledge about mental health and body immunity before and after attending the webinar (p = 0.000). The result is there are an increase in public knowledge after the webinar is conducted. We hope that community can maintain mental health and be able to meet nutritional needs to increase immunity during the Covid-19 pandemic.