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What to do if you ALREADY have chronic stress -- but the stressor is gone

I had a long period of extreme stress. That stressor is now gone (over a year now), and my life is great and health is otherwise good. I'm eating and exercising and getting light and doing ALL the things my Dr. recommended to improve stress and help HRV. And I've been doing all the things you recommend for at about a year. Loads of test have been run and nothing is wrong. BUT all of my HRV related metrics are truly abysmal and showing no signs of improving. Also I have. very low heart rate dip when sleeping. I had been keto and IF with a 6 hr or less window for years but also tried stopping and in case that was the culprit (it wasn't). Looking for any advice as to what to do or who to see or what to read for those who already have chronic stress, as most the literature I see is to prevent this problem not deal with it and I'm afraid my attempts to deal with it may be aggravating it. I saw a cardiologist and he scoffs at people taking their own measurements. (Note I wear an Apple Watch Ultra and take HRV readings upon waking, in the same position. It should be fairly reliable.)

Tuo Circadian Smart Bulbs

You mentioned Tuo during your recent Journal Club with Peter Attia. Can you elaborate on Tuo's technology, and why you see it as promising? How do you use the Tuo bulbs in your home and workplace? Why do you think Tuo's tech is more promising than the other "circadian" bulbs on the market? Do you plan to interview the Tuo scientist and delve deeply into the tech, protocols, benefits, risks (if any), cost, etc. of their product(s)? Thanks!

REHIT (reduced exertion high intensity interval training), and CAROL Bike

Please consider interviewing CAROL's CEO and co-founder, Ulrich Dempfle, about REHIT (reduced exertion high intensity interval training) and the science behind (and their claims about) raising VO2 Max by up to 12% in 8 weeks using their CAROL Bike.

Neuro Tech IQ

what is your opinion on this supplement

NAD+

What are your thoughts on NAD+ supplementation. I’ve heard it the best supplement for cellular health but have also heard it’s useless and unnecessary. Can you explain what it is, what it does and whether can provide any benefits. Thank you.