Protein requirements in humans.

Area of Science:

• Nutrition Science
• Dietary Guidelines
• Public Health

Background:

• Established protein requirements are crucial for public health and nutritional guidance.
• Previous adult protein recommendations utilized desirable body weights, necessitating an update for broader applicability.

Purpose of the Study:

• To outline general principles of protein requirements.
• To derive updated daily protein allowances for various age and sex subgroups within the United States population.
• To incorporate updated methodologies for calculating protein needs.

Main Methods:

• Utilized median body weights instead of desirable body weights for all age groups.
• Adopted the protein requirement for adults as 0.6 g/kg/day of high-quality protein, per FAO/WHO/UNU recommendations.
• Applied an age-specific scoring system and analyzed the amino acid composition and digestibility of the U.S. diet.

Main Results:

• The daily protein allowance for adults was adjusted to 0.83 g/kg/day for mixed U.S. dietary protein.
• This updated value is comparable to previous Recommended Dietary Allowances (RDAs) but derived using a novel methodology.
• Tabulated data for daily protein allowances across U.S. population groups (children to adults) are presented, including special considerations for pregnancy and lactation.

Conclusions:

• The revised protein allowances provide a more accurate reflection of nutritional needs across the U.S. population.
• The updated methodology ensures recommendations are based on current scientific understanding and dietary patterns.
• These allowances serve as a vital reference for public health nutrition and dietary guidance.