A 3-Group, Parallel-Group Randomized Clinical Trial Comparing Usual Care, a WeChat-Delivered Mobile Health Intervention, and the Same Intervention Plus Enhanced Human Support for Children With Autism in China

Inclusion Criteria

Inclusion Criteria: * 1\. Aged 8 to 16 years at the time of enrollment 2. Confirmed diagnosis of autism via prior clinical documentation, verified by the Childhood Autism Rating Scale, Second Edition (CARS-2) 3. Parent or legal guardian is able and willing to provide written informed consent for the child's study participation 4. The family has consistent smartphone access to receive and engage with the WeChat-based intervention 5. No baseline obesity, as defined by age- and sex-specific BMI cutoffs for Chinese children and adolescents Exclusion Criteria: * 1\. Meets the definition of baseline obesity per age- and sex-specific BMI cutoffs for Chinese children and adolescents 2. Has any medical or developmental condition that precludes safe participation in the remotely delivered lifestyle intervention 3. Unable to comply with the study intervention and assessment procedures 4. Parent or legal guardian refuses to provide written informed consent for the child's study participation