Are We Going to Start Calorie Restricting for the Next 50,000 Years?

This model has never actually been proven in humans. So what has been done is a shorter term calorie restriction trial. The problem is to find out whether or not these people live longer, you have to run the study for a long time and you have to wait for a bunch of them to unfortunately pass away. Instead, the researchers looked at biomarkers. Eddie, do you want to define what biomarkers are?