Using the lens of nutrition security and equity for the living beings and living systems of the planet, Nutrition Security for Planetary Health takes an integrated, systems approach that not only delineates the antecedents of the multifaceted environmental crises—but offers solutions including the extensive co-benefits of whole plant foods nutrition as the foundational dietary pattern for improving planetary health. Overlooked yet inseparable problems that connect food systems to the transgression of our planetary boundaries, chronic disease, and zoonotic disease are discerned. Bolstering nature and biodiversity is emphasized throughout including regenerative agroecology, native plant foods and ecosystems, utilizing traditional and Indigenous wisdom, rewilding, and community science. Lastly, inspiring vignettes demonstrate the power of individual and collective actions that advance planetary health.