EFSA 2012

• For healthy adults of both sexes, AR for protein set at 0.66 g per kg body weight per day, while the PRI is set at 0.83 g per kg body weight per day.
• In adults an intake of twice the PRI can be regarded as safe; some physically active and healthy individuals in Europe regularly consume such intakes. 'Concerns about the potential detrimental effects of very high protein intake remain controversial'.
• EFSA also concludes that 'the available data are insufficient to specifically determine the protein requirement in older adults and that at least the same level of protein intake as for young adults is required for older adults. As sedentary older adults have a lower energy requirement the protein to energy ratio of this subgroup is higher than for younger adults'.

WHO/FAO/UNU 2007

• For healthy adults of both sexes, 0.66 g per kg body weight per day of protein accepted as AR, while the save level of intake was set at 0.83 g per kg body weight per day, expected to meet the protein needs of 97.5% of healthy adult population.
• 'No safe upper limit has been identified, and it is unlikely that intakes of twice the safe level are associated with any risk. However, caution is advised to those contemplating the very high intakes of 3–4 times the safe intake, since such intakes approach the tolerable upper limit and cannot be assumed to be risk-free'.
• Requirements for the elderly population are considered to be equal to that of adults.  However, 'for any diet considered to be limiting in protein, the population groups most likely to be at risk are elderly people, especially sedentary women. This means that while calculated protein requirements for elderly people are not different from those for younger adults, unless the elderly people are physically active they will require more energy-dense food'.

DACH 2016

• The AR for high quality protein is 0.6 g per kg body weight per day.
• The recommended intake in adults (19-65 years old) is 0.8 g protein per kg body weight per day. The value is based on the AR and takes into account individual variability and the reduced protein digestibility in mixed diets.
• For adults older than 65 year old, the recommendation does not differ.

NNR 2012

• Daily intake of 0.66 g good-quality protein per kg body weight per day and a subsequent RDA of 0.83 g good-quality protein per kg body weight per day, regardless of sex or age. 'Based on the available evidence, and according to the Nordic dietary habits, a protein intake corresponding to 10–20 E% is recommended'.
• For older adults, 'A protein intake corresponding to 15–20 E% is recommended, and with decreasing energy intake the protein E% should be increased accordingly because the protein needs do not change in a corresponding manner'. Additionally, 'For food planning purposes, the recommendation is 18 E%, which cor­responds to about 1.2 g protein per kg body weight and day'.
• Upper range for protein intake set at 20 E% for adults.

• For a healthy adult, the estimated AR for protein is set at 0.66 g per kg body weight per day, and a recommended intake is determined as 0.83 g per kg body weight per day. 'Given the lack of data available, it is difficult to define a tolerable upper intake level for protein intake'.
• For older adults (>60 yrs), the AR has been set at 0.8 g per kg body weight per day, while the recommended intake is 1 g per kg body weight per day. In addition, 'current data suggest that it would be preferable in the elderly to group protein intake into one main meal, to more strongly stimulate protein anabolism'.