The Reducing Obesity in Youth Act of 2025 aims to amend the Public Health Service Act to significantly improve healthy eating and physical activity among children aged birth through five years, while also addressing the critical issue of food insecurity within this age group. The legislation establishes a new Healthy Kids Grant Program , administered by the Secretary through the Centers for Disease Control and Prevention (CDC) Director, in coordination with the Assistant Secretary for the Administration for Children and Families. This program will award five-year competitive grants to eligible entities, including nonprofit organizations with expertise in early childhood health and obesity prevention, institutions of higher education , or consortia thereof. Grant recipients will work with implementing partners, such as States, territories, Indian Tribes, and municipalities, to create sustainable programs. These programs will focus on training early care and education providers through direct coaching and professional development, building State capacity to integrate healthy eating and physical activity into existing programs, and testing innovative, evidence-informed approaches. A key aspect of the grant program is the requirement for implementing partners to serve racially, ethnically, socioeconomically, and geographically diverse populations, including both rural and urban settings. The bill also mandates the Secretary to contract with an external entity for a national independent evaluation to ensure compliance and assess outcomes. Furthermore, it authorizes appropriations of $5,000,000 for each of fiscal years 2026 through 2030 for the grant program, with an additional $1,700,000 for fiscal year 2026 specifically for tracking State progress in obesity prevention and food security.