The recommended dietary allowance for protein is an additional 10 g per day in pregnancy, based on balance studies that show 1.3 to 2.1 g nitrogen (8.1 to 13 g protein) retention during pregnancy with the greater amount retained during the third trimester. A population based study of Women, Infants and Children (WIC) participants reported lower birth weights when women consumed >85 g protein per day compared to women who consumed 50 to 84.5 g per day.

• Grade I means there is Good/Strong evidence supporting the statement;
• Grade II is Fair;
• Grade III is Limited/Weak;
• Grade IV is Expert Opinion Only;
• Grade V is Not Assignable.
• High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
• Moderate (B) means we are moderately confident in the effect estimate;
• Low (C) means our confidence in the effect estimate is limited;
• Very Low (D) means we have very little confidence in the effect estimate.
• Ungraded means a grade is not assignable.