This video explains why all the confusion and why for many westerners, it may be better to have less than more.

The adverse effects associated with long-term high protein diets may include disorders of bone and calcium balance, disorders of kidney function, increased cancer risk, disorders of the liver, and worsening of coronary artery disease. Therefore, there is currently no reasonable scientific basis to recommend protein consumption above the current recommended daily allowance, due to its potential disease risks.

No added benefit to frail or pre-frail individuals taking any of those supplements compared to taking a cornstarch placebo. A similar trial of hundreds of sarcopenic men and women, 75 and older, given 40 grams of whey-enriched protein a day, combined with exercise, for an entire year with a 43-month follow-up found that all the extra protein did not slow the deterioration of muscle mass and physical performance significantly better than a placebo––all the more important since it is one of the largest and longest-lasting randomized controlled trials ever published on the subject. 

Consumer Reports noted that an investigation of 134 top-selling protein powder products found virtually all tested positive for at least one heavy metal, building on their own study that concluded “You don’t need the extra protein or the heavy metals our tests found.”