© 2022. Revista de Nutricao.All Rights ReservedObjective The Coronavirus disease 2019 is a global public health problem that has led to psychological disorders (depression, anxiety, etc.), especially in fragile individuals such as those affected by multiple sclerosis. This study investigated the relationship between anxiety and nutritional habits during the Coronavirus disease 2019 outbreak in multiple sclerosis patients. Methods This cross-sectional study was an online survey of multiple sclerosis patients living in Turkey. The total sample consisted of 294 multiple sclerosis patients. A questionnaire containing general demographic data, the Beck Anxiety Inventory, and nutritional attitudes and habits was applied to multiple sclerosis patients. Results Moderate or severe anxiety scores were found in 42.2% of multiple sclerosis patients. Weight gain was reported in 40.5% of them during the outbreak. A statistically significant difference was found in the distribution of individuals’ Beck Anxiety Inventory scores for consumption of nuts/seeds, rice/pasta, cake/cookies, and water. A 1-unit increase in Beck Anxiety Inventory scores led to a 1.04 times increased consumption of bread and rice/pasta and a 1.05 times increased consumption of cake/cookies either before or after controlling for potential confounders. A 1-unit increase in Beck Anxiety Inventory scores led to a 1.06 times decreased consumption of water and a 1.04 times decreased consumption of meat and poultry, fruit (fresh), and rice/pasta, either before or after controlling for potential confounders. Conclusion During the Coronavirus disease 2019 outbreak, anxiety led to changes in multiple sclerosis patients’ nutritional habits and food preferences. The continuous surveillance of psychological consequences and nutritional counseling during outbreaks should become routine as part of preparedness efforts worldwide.