Improving Mental Health and Wellness in Schools Act This bill requires local educational agencies (LEAs) participating in the school lunch or breakfast programs to include in their local school wellness policies (1) goals for mental health promotion and education, and (2) nutrition guidelines for reducing childhood eating disorders. Such LEAs must also include registered dietitians and school-based mental health services providers in the development, implementation, and periodic review of such policies. The bill also requires the Department of Agriculture to provide information and technical assistance to school health professionals (including school-based mental health services providers) for use in establishing healthy school environments. Such technical assistance must promote mental health, encourage mental health assessments, and establish resilient school environments.