How much faith to put in science?

Did you know if you eat black boiled eggs that are cooked in the sulphuric volcanic springs in the Owakudano Valley of Japan you can add seven years to your life? They exude an unpleasant odor, but what the heck. How do I know this? I just read about it an hour ago. I have also recently reread "Extraordinary Popular Delusions and the Madness of Crowds" by Charles MacKay. You don't have to always agree but keep on plugging away.