This book serves as a comprehensive guide to the field of nutritional biochemistry and its significance in human health and disease. It begins with an introduction to nutritional biochemistry, laying the groundwork for understanding how nutrients interact with metabolic pathways, cellular functions, and physiological systems. By bridging the gap between nutrition and biochemistry, the text establishes a strong foundation for exploring the biochemical principles that govern nutrient utilization, storage, and regulation within the body. The role of macronutrients is discussed in detail, with emphasis on carbohydrates, proteins, and lipids and their respective contributions to energy production, structural integrity, and metabolic regulation. The book explains how these macronutrients are metabolized and how their balance is essential for maintaining energy homeostasis and preventing metabolic disorders. Alongside this, the focus on micronutrients highlights the indispensable roles of vitamins and minerals in supporting enzymatic reactions, hormonal balance, and cellular defense mechanisms. The text underscores how deficiencies or excesses in micronutrients can profoundly affect health, leading to conditions such as anemia, osteoporosis, or impaired immunity.

A major component of the book explores the processes of digestion, absorption, and transport of nutrients, offering readers an understanding of how food is transformed into biologically active molecules that fuel metabolic functions. This section emphasizes the complexity of nutrient assimilation and the influence of genetic and environmental factors on these processes. The discussion on energy balance and metabolism further explains how the body regulates energy intake and expenditure, addressing the biochemical mechanisms underlying weight regulation, obesity, and metabolic syndrome.

Recognizing that nutritional needs vary throughout life, the book includes a section on nutrition across the life cycle, detailing the specific requirements of infants, children, adolescents, adults, pregnant women, and the elderly. It demonstrates how nutrition influences growth, cognitive development, reproductive health, and aging, while also highlighting vulnerable populations who may require targeted interventions. The text also examines the interplay between nutrition and the immune system, explaining how dietary patterns and nutrient availability shape immune resilience, inflammatory responses, and disease susceptibility.