After baseline data collection, the intervention group received a 30-60 minute educational session with a dietitian and clinicians, including a health education prescription. Interventions occurred at weeks 1, 12 and 24, with routine evaluations of disease, diet, physical activity, and adherence. Follow-ups at 48 weeks assessed NAFLD extent, dietary profile, and health knowledge for both subjects and guardians.

NAFLD was diagnosed using liver ultrasonography with a Phillip IU Elite color Doppler ultrasound after a fasting period to reduce gastrointestinal interference.

The dietary habits of the subjects were evaluated by a semi-quantitative Food Frequency Questionnaire (FFQ), which was recalled over the past month and included food items, frequency, and amount of intake. The FFQ used in this study covered 72 food items from 11 food groups and 4 frequency categories, including 'average daily, weekly, monthly intake or hardly eat'.

Physical Activity Questionnaire for Children (PAQ-C) was answered by subjects. The PAQ-C reflects the overall physical activity level of children in the past 7 days.The scale consists of 10 items, .and a 1-5 scale was used to obtain a total score by summing the scores of the individual items. The PAQ-C scale scores < 2.33 defined as low physical activity levels, 2.33-3.66 as moderate physical activity levels, and >3.66 as high physical activity levels.

Height was measured using Height Measuring Ruler (Selcom, Germany) .

Body weight was measured using Body Composition Analyzer (DC-13, Parade, Japan).