Intervention programme
The NL online intervention programme consisted of five units, each taking approximately 30 min to complete. The learning objectives for each unit were derived implicitly from the corresponding NL domains and indicators (details in Table 
Learning objectives and contents of the NL online intervention programmeNotes: NL, nutrition literacy; For nutrition literacy abilities (e.g. 1-1-1), the first number refers to the type: 1 = understand, 2 = analyse, 3 = appraise, and 4 = apply; the middle number refers to different health themes according to the Dietary Guidelines for Taiwanese; the third number corresponds to the serial number.
Sample from the NL online intervention programmeNotes: NL, nutrition literacy.