This course offers a clear, scientific introduction to the basics of human nutrition, focusing on essential nutrients and their physiological roles. It explains how the body obtains energy, supports cellular growth and recovery, and maintains internal balance for health and physical performance. The course covers macronutrients, micronutrients, water, and balanced diet principles, corrects common nutrition myths, and introduces dietary supplements with an evidence-based approach. It is suitable for anyone seeking a solid scientific foundation in nutrition, whether for general health or as a starting point for more advanced study.