Most often overlooked on a standard blood test are the mean corpuscular volume (MCW) and Red Blood Cell Distribution Width (RDW). How do they change during aging, and what’s associated with all-cause mortality risk? Also, with the goal of optimizing MCV and RDW, how does my diet correlate with these biomarkers?
Michael Lustgarten 
My MCW is 93.9 and my RDW is 11.7. What causes high MCW? I have very youthful stats everywhere else but this.
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It could be lots of stuff for MCV, the key is figuring out what impacts it for you. B12 deficiency can impact it, as a starting point.
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