The COVID-19 pandemic has forced a lot of people, including Indonesian citizens to face various changes, adapt to the current situation, and implement new lifestyle habits. Measures have been taken to minimize the risk of COVID-19 transmission, such as implementing the health protocols which include washing hands, wearing masks, social distancing, avoiding crowds, and minimizing mobility. Furthermore, maintaining and increasing the body?s immune system is crucial as an effort to prevent COVID-19 infection. One of the ways to increase the body?s immune system is through a balanced diet and consuming nutritious food. Therefore, this research is conducted to analyze the community's comprehension about nutrition during the pandemic. This research was a descriptive analytic study. The data was collected twice, prior to- and following the intervention, using google form which contained several questions regarding nutritional knowledge. The number of participants which fulfilled the inclusion criteria includes 53 people aged 18-35 years old. There was a significant difference between the average knowledge related to the results of community knowledge before (46.25) and after (56.47) providing education (p= 0.001) where there was an increase of 22.1%. Education given through online webinar SEROTONIN 2021, improved the community?s knowledge about nutritional health during the COVID-19 pandemic, especially in productive age.