How much protein do I need daily?

Recommended daily protein depends on body size, age, activity and health. The United States Institute of Medicine Food and Nutrition Board sets the Recommended Dietary Allowance for healthy adults at 0.8 grams of protein per kilogram of body weight per day; that value is intended to meet the needs of nearly all healthy people for maintenance of lean mass and basic metabolic functions. The World Health Organization technical guidance aligns closely and uses a similar population reference when assessing requirements for health. General recommendations and meal distribution Evidence from exercise and aging research indicates many people benefit from higher intakes than the baseline. Stuart M. Phillips at McMaster University has emphasized that older adults commonly require around 1.0 to 1.2 grams per kilogram per day to reduce age-related muscle loss and preserve physical function, because anabolic resistance increases with age. For people engaged in regular endurance or resistance training, position statements from the International Society of Sports Nutrition led by Jose Antonio at Nova Southeastern University recommend ranges roughly between 1.2 and 2.0 grams per kilogram per day, depending on training load, goals and energy balance. Practical nutrient timing also matters: distributing protein intake across meals and including a moderate bolus of high-quality protein at each meal supports muscle protein synthesis according to randomized trials and expert reviews. Special populations, risks and broader consequences Pregnancy, lactation and periods of growth raise protein needs above the adult baseline to support fetal and child development. Clinical conditions such as severe burns or critical illness require substantially increased protein for wound healing and immune function, while chronic kidney disease requires individualized prescriptions because impaired renal function can change safe upper limits. Persistent protein insufficiency can lead to loss of muscle mass, reduced mobility in older adults and higher risk of infections and delayed recovery from illness. Excessive protein from limited food variety, particularly high amounts of animal-sourced protein, can contribute to higher saturated fat intake and environmental impacts. Environmental and cultural context Food system impacts vary substantially by protein source. Joseph Poore at the University of Oxford and colleagues quantified that animal-based proteins, especially beef, typically generate greater greenhouse gas emissions, land use and water footprint per gram of protein than most plant-based alternatives. Cultural dietary patterns and territorial food availability also influence feasible protein choices: many communities rely on legumes, fish or mixed plant-animal dishes that balance cultural acceptability and resource constraints. Public health guidance therefore weighs both individual nutritional needs and sustainability considerations when advising population-level protein targets. Applying recommendations to daily life To calculate a starting point, multiply body weight in kilograms by 0.8 for a baseline adult requirement, then adjust upward for older age, pregnancy, heavy training or recovery needs, using clinical advice when chronic disease is present. Choosing a variety of protein sources, distributing intake across meals and consulting registered dietitians or medical professionals for personalized plans helps align nutritional adequacy with cultural preferences and environmental values.