Peter Attia· MD
a biomarker generically is something that's easy to measure that you is informative about something that's hard to measure a classical example famous example is you want to know how many cigarettes somebody smokes a day they'll lie to you but if you measure cine in their blood that's a byproduct of nicotine you don't have to ask them you can find out how many cigarettes they had in the last couple of days by measuring blood coat that's a biomarker of of cigarette consumption