Be warned: these studies will start getting cited in the nutrition wars. Okay that’s the this side of the wall summary of the summary of the studies in last week’s Science. From their other side of the wall synopsis:
The mouse study in my mind is pretty poor. Studying protein levels up to 60% of caloric intake?? That is more than most think of as high protein. Typical American gets, as noted, about 16% of calories from protein. For most high protein means 25 to 30%. The supplemental information pg 8 gives the actual mortality numbers for the different diet plans. The highest median lifespan was actually a 42% protein diet and it was not far off from the top numbers for longest lifespan. On page 7 of that supplement it is noted that the animals in 3 the low protein groups wer dropped from analysis early because they were too unhealthy (lost too much weight or develped other health issues) to continue. Not quite a fair analysis.
The human study seems a bit better. From its summary:
This is not enough yet to convince me honestly and for my own sake I am planning to keep up with my relatively high protein high fiber (heavy on the plant derived proteins) nutrition approach. (Not low carb mind you.)
But I am sure that these studies will get cited in the nutrition wars and felt that those who are combatants should get a heads up!