Comment My observations (Score 3, Insightful) 108
Here comes a data-point of one, which makes this simply an anecdote...
When I work out hard (resistance training to beyond failure) I find that consuming protein at around 1.6-1.8g per kilo of body weight significantly improves my recovery time -- perhaps because of the effect on muscle-protein synthesis which seems to be optimal at this level.
Working out hard with lower levels of protein intake adds at least a day to my recovery so it's easy to see why, given the fixation on strength and fitness that abounds right now, many people are consuming more protein than they might actually need if their goal is simply to remain healthy.
One consideration for many is that when you bias towards a high-protein low fat/carb diet it becomes easier to lose weight or prevent weight gain. Protein is generally more satiating than carbs and leaves you feeling fuller for longer, reducing hunger pangs. A diet higher in protein is also less likely to produce insulin resistance (type 2 diabetes) than one higher in carbs. However, protein is usually also far more expensive (per calorie) than protein which can be a factor in many people's decision-making.
Increasing protein intake (as a percentage of total calories) is also important as you age because it plays a role in reducing the effects of sarcopenia, a condition that affects most over-50s and predisposes people to becoming frail and increasing their likelihood of death from many causes.