This study aimed to determine changes in nutrition and physical activity in adults during the COVID-19 pandemic. The population of this descriptive-cross-sectional study consists of adults between the ages of 18-64. The data was collected online using the "Personal Information Form" and "Nutrition and Physical Activity Change Survey" between February and April 2021, after receiving the approval of the Ministry of Health and the ethics committee. Data were evaluated by number, percentage and chi-square test. According to the results, 78.1% of the participants were women, 24% were married and 10.7% had a chronic disease. During the COVID-19 epidemic, 50.2% had a decrease in physical activity time, 70.5% had a decrease in sedentary time, 44.1% had an increase in body weight, and 43.7% had a decrease in junk food, snack and appetizer consumption. There was an increase. Participants stated that they did not engage in physical activity for various reasons such as lack of a suitable environment for sports, lack of time, and curfew. Obesity represents a critical global public health problem that continues to increase. The COVID-19 pandemic has significantly affected individuals' daily lifestyles, leading to reduced physical activity opportunities and weight changes for many. To minimize the long-term impact of the COVID-19 pandemic on non-communicable chronic diseases, it is crucial to prioritize efforts to inform and counsel adults on adopting healthy nutrition and physical activity practices.