This module explores the metabolic characteristics of cancer cells and the potential role of ketogenic diets and intermittent fasting as adjunctive nutritional strategies in cancer care. It covers the Warburg effect, insulin and IGF-1 signaling, the PI3K/AKT/mTOR pathway, ketosis, metabolic switching, and autophagy. The module also addresses ketogenic dietary composition, fasting approaches, nutritional monitoring, contraindications, and potential integration with cancer treatment under appropriate clinical supervision. Emphasis is placed on individualized nutrition planning, preservation of lean mass, metabolic safety, and the principle of supporting healthy tissues while targeting tumor metabolism.