"Vitamin Deficiency" addresses the silent epidemic of nutrient deficits in aging adults, exploring the connection between diminished nutrient absorption and compromised health. This book highlights how the aging process reduces the efficiency of the digestive system, making older adults more susceptible to deficiencies in essential vitamins like Vitamin D and B12. Did you know that these deficiencies can impact not only physical health but also cognitive function and immune system strength? The book uniquely combines biology, health and fitness, and life sciences to provide a holistic understanding of age-related nutrition. It progresses from explaining the fundamentals of vitamin absorption to identifying common deficiencies and detailing dietary and supplementation strategies. With a factual tone, the book offers practical, actionable information, emphasizing personalized nutrition plans tailored to individual needs. The book provides evidence-based dietary adjustments and supplementation strategies to mitigate these deficiencies and support optimal health throughout the aging process. The book references reports from the National Institutes of Health (NIH) and the World Health Organization (WHO). Readers will discover how simple dietary changes and targeted supplementation can optimize their health and extend their active years.