Older adults in the US are increasingly dying from unintentional falls

[Bernardo de La Paz]

21. That is higher than necessary. Recommended up to 2 g/kg for older people

You have some basis, in that issues around high protein diets are not clear. Kidney disease is not the only potential issue. Bone density loss is another. But on both of those, it is not clear if there are issues.

I would add that high protein can crowd out other nutrients from lower consumption of fruit and vegetable, such as fibre and anti-oxidants.

Muscle strength is not the only issue contributing to falls. Also important are inner ear balance issues, cognitive issues, and vision. Reasonable exercise (higher than average) helps everything.

Several studies have concluded that active people and athletes may require elevated protein intake (compared to 0.8 g/kg) due to increase in muscle mass and sweat losses, as well as need for body repair and energy source.[41][42] Indeed, it has been shown that protein contribute around 3% of the total energy expenditure during exercise.[47] Suggested amounts vary from 1.2 to 1.4 g/kg for those doing endurance exercise to as much as 1.6-1.8 g/kg for strength exercise[42][44] and up to 2.0 g/kg/day for older people,[48] while a proposed maximum daily protein intake would be approximately 25% of energy requirements i.e. approximately 2 to 2.5 g/kg.[41] However, many questions still remain to be resolved.[42]

In addition, some have suggested that athletes using restricted-calorie diets for weight loss should further increase their protein consumption, possibly to 1.8–2.0 g/kg, in order to avoid loss of lean muscle mass.[49]

There is little consensus on the potentially detrimental effects to healthy individuals of a long-term high protein diet, leading to caution advisories about using high protein intake as a form of weight loss.[60][54][61]