| Investigated questions |
| Subjective impact |
| Epidemic concern: “How concerned do you feel about COVID-19?” |
| Impact on psychology: “What about the affection of your psychological status by COVID-19 ?” |
| Impact on life: “What about the affection of your daily life by COVID-19 ?” |
| Impact on work: “What about the affection of your work or study by COVID-19 ?” |
| Baseline of dietary habit |
| Salt intake: “Before COVID-19, What about your dietary intake of salt?” |
| Intake frequency of fried food: “Before COVID-19, how often did you normally eat fried foods?” |
| Intake frequency of sugary foods: “Before COVID-19, how often did you normally eat sugar or sugary foods (including sugary drinks, desserts, biscuits, sweets, fruit products, dairy desserts etc)?” |
| Willingness to change dietary intake |
| Salt: “Do you plan or are you changing salt intake after the COVID-19 epidemic” |
| Fried food: “Do you plan or are you changing the intake of fried food after the COVID-19 epidemic” |
| Sugary foods: Do you plan or are you changing the intake of sugary foods after the COVID-19 epidemic” |
