Macronutrients—carbohydrates, proteins, and fats—are the primary nutrients required by the body in large amounts to provide energy and support essential physiological functions. Carbohydrates are the main source of energy, proteins are crucial for tissue repair and immune function, and fats are important for cell structure and hormone production. The balance and quality of macronutrient intake significantly impact overall health, influencing body weight, metabolic processes, and disease risk. For instance, high carbohydrate intake from refined sugars can lead to obesity and diabetes, while a diet rich in healthy fats (like omega-3 fatty acids) supports heart health. Nutritional research focuses on understanding the optimal macronutrient ratios for different populations, considering factors such as age, activity level, and health conditions. This helps shape dietary recommendations that promote longevity and reduce the risk of chronic diseases.