How Much Protein Do You Actually Need? A Dietitian’s Evidence Review

Protein is having a cultural moment, with high-protein everything crowding store shelves and social media feeds. The marketing is ahead of the nuance, so we want to provide a clear, evidence-grounded answer to the question we are asked almost daily: how much protein do you actually need? The official Recommended Dietary Allowance of 0.8 grams per kilogram of body weight is a minimum to prevent deficiency — not an optimal intake for most active adults. The research increasingly supports higher targets.

For healthy, moderately active adults, current evidence suggests 1.2 to 1.6 grams of protein per kilogram of body weight per day supports better muscle maintenance, satiety and metabolic health than the RDA minimum. For older adults over 65, for whom muscle preservation is a critical health priority, 1.2 to 1.6 grams per kilogram is the emerging consensus recommendation. For athletes and those in weight loss phases, needs may be higher still — up to 2 grams per kilogram in some protocols. Critically, distributing protein evenly across three or four meals is more effective for muscle protein synthesis than concentrating it in a single high-protein dinner.

Protein quality also matters. Leucine — an amino acid found in highest concentrations in animal proteins, soy, legumes and dairy — is the key trigger for muscle protein synthesis. But this does not mean plant proteins are insufficient — it means that plant protein sources need to be consumed in adequate quantities and variety to achieve the same amino acid completeness. Whether you eat animal foods or not, a registered dietitian can help you meet your protein needs in a way that fits your health goals, budget and preferences.

Sources

• Stokes T, et al. Recent perspectives regarding the role of dietary protein for the promotion of muscle hypertrophy with resistance exercise training. Nutrients. 2018;10(2):180.

• Bauer J, et al. Evidence-based recommendations for optimal dietary protein intake in older people. J Am Med Dir Assoc. 2013;14(8):542-559.

Ready to take the next step in your nutrition journey? Schedule an appointment at NutriGreene today. www.nutrigreene.com | (203) 429-4211 | info@nutrigreene.com