The Beneficial Role of Right Amount and Quality of Protein for Ensuring Child Growth and Development of Bone and Muscle Mass

Protein is a vital macronutrient, essential for growth, tissue repair, and immune function. However, the impact of elevated protein intake during childhood and adolescence remains controversial. While high protein intake in older adults is often recommended for maintaining muscle mass and preventing frailty, excessive intake in younger populations has raised concerns about potential health risks, particularly related to obesity. This review aims to update current literature on the long-term effects of protein consumption in children and adolescents (ages 4-18) and to explore emerging methods for evaluating protein metabolism in this age group. The RDA for protein varies based on age, sex, and activity level. Generally, it is suggested that children consume about 0.95-1.3 grams of protein per kilogram of body weight per day, depending on age and specific requirements. In many developed countries, children and adolescents often consume protein at levels 2-3 times higher than the RDA, potentially leading to both positive and negative health outcomes. Protein is critical for normal growth and development during childhood and adolescence. Adequate intake supports muscle development, immune function, and the production of hormones. Studies suggest that elevated protein intake may be linked to increased Fat-Free Mass Index (FFMI), which is beneficial for muscle development and overall body composition. High protein diets have been associated with increased satiety, which can help in managing appetite and potentially reducing overall caloric intake, thus contributing to healthier weight maintenance. Some evidence suggests a correlation between high protein intake in infancy and childhood and increased risk of obesity later in life. This association may be due to the overactivation of growth pathways and increased insulin-like growth factor-1 (IGF-1) levels. Excessive protein intake has been hypothesized to strain kidney function, especially in individuals with pre-existing kidney conditions. However, current evidence in healthy children and adolescents is inconclusive. This narrative review emphasizes the need for a nuanced understanding of protein intake in children and adolescents, considering both the benefits and potential risks associated with high protein consumption. As research evolves, dietary guidelines may need to be adjusted to reflect the latest findings.