IMO, no need for anyone with normal needs and diet and according to sports org, there is no need for Elite male endurance athletes either
http://www.ausport.gov.au/ais/nutrition/factsheets/basics/protein_-_how_much
Are protein supplements useful?
Generally, athletes can obtain all the protein they require from a good mixed diet. Occasionally, an athlete may require a supplement when a practical way to consume sufficient food cannot be found. Many protein supplements are very expensive due primarily to the amount of marketing that accompanies products and the processing required to extract the protein from cow’s milk. They tend to provide very large amounts of protein and little other nutrients. There is no need for the amount of protein provided by many supplements and there is certainly no justification for the extra cost. The most suitable supplement is one that provides both protein and carbohydrate. Good alternatives to protein supplements include homemade fruit smoothies, liquid meal supplements such as PowerBar Protein Plus powder and 20 g skim milk powder added to regular milk.
Can athletes have too much protein?
Daily protein intakes under 2 g/kg BM in healthy people are unlikely to cause side effects. Less is known about the long-term side effects of protein intakes above 2 g/kg BM. High protein intakes can increase the amount of calcium excreted in the urine. This may cause problems with athletes at risk of weakened bones - for example, female athletes with low energy intakes who are not menstruating. High protein intakes are also known to accelerate the progression of pre-existing kidney disease.
From a nutritional point of view, excessive intakes of protein tend to be expensive especially if protein supplements are used. High protein intakes based on the consumption of large amounts of animal foods (e.g. meat and dairy foods) can result in a greater fat intake. High protein intakes may increase fluid requirements. However, the main concern is that excessive focus on high protein foods may displace other valuable foods (e.g. fruit and vegetables) or other important nutrients such as carbohydrate and fibre from the diet.
