The "Optimal Terrain Ten Protocol" is a metabolic-focused nutrition protocol designed by Dr. Nasha Winters and Jess Higgins Kelley to prevent and manage cancer. This protocol centers around the ketogenic diet, utilizing ketones as the body's primary fuel and emphasizing phytonutrients from low-glycemic plant and animal foods. It avoids grains, legumes, sugar, genetically modified foods, pesticides, and synthetic ingredients, instead promoting whole, wild, local, organic, fermented, and heirloom foods. The protocol addresses 10 key hallmarks of cancer, including epigenetics, the microbiome, the immune system, toxin exposures, and blood sugar balance, providing a non-toxic, metabolic-focused nutrition plan to combat cancer and promote optimized living.