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Free T and total T, targets vs age

What is the proper target for total testosterone and free T based on age. I am 72 and depending on the sources I choose the numbers vary widely. Should I care only about free t or is total T important. My total T has been in the range of 650-750 for the last 4 years. My free T has varied significantly from below the bottom of the range to about the top of the range. Currently it is smack in the middle. I take boron 2mg daily and I have a Joove which I use atleast every other day.

Eye Health

Is there any intervention that can be done now to improve eye health? Is being nearsighted an epidemic? I don’t want to be in the blind centenary olympics

Can diet reverse gallbladder disfunction?

Having a dodgy gallbladder myself, I would love to know how one works, what it does, why it malfunctions, and when it should be removed and why. Can malfunction be controlled with diet? If so, what diet?

Microbiome, Metabolic Disease

While I absolutely love the depth of coverage of metabolic syndrome from so many angles, there is so much insanely cool research around the role of the microbiome and the gut as yet another endocrine organ, that it feels like a gaping hole in the coverage! It's an eye popping subject and would love to see the same level of passion for systemic thinking encompass the gut. I know Drs Sonneberg of Stanford have done some wonderful writing and presentations on the subject and would be good candidates to come on the podcast? (and I bet there are lots more).

Sugar intake for endurance athletes

are their any long-term effects in taking gels or any of these energy products if you are training on a weekly basis for ironman type races for multiple years