Your genes influence nearly every aspect of your health, acting as an instruction manual that guides your body's development, function, and overall well-being. With approximately 20,000 genes, some health conditions are primarily genetic. However, genes alone don’t dictate your future—environmental factors also contribute. This combination of genetics and external influences is known as multifactorial inheritance, which affects the risk of various conditions, including autoimmune diseases, cancer, and mental health disorders like anxiety and depression.