<table><tr><th>From:</th><th>Peter Attia</th></tr><tr><td>Sent:</td><td>Sunday, October 4, 2015 7:39 PM</td></tr><tr><td>To:</td><td>jeffrey E.</td></tr><tr><td>Subject:</td><td>RE: What were you asking about in your email yesterday?</td></tr></table>

Ah, yes, the use exogenous ketones. It's still not clear which ones are best, but there are (broadly) 3 main variants:

1. BNB ester

2. AcAc ester

3. BNB salts (many types: Na, Ca, Mg)

From: jeffrey E. [mailto:jeevacation@gmail.com] Sent: Sunday, October 4, 2015 12:36 PM To: Peter Attia Subject: Re: What were you asking about in your email yesterday?

we had spoken re the re-breather for diving and i thought you said there was a drug that minimized danger

On Sun, Oct 4, 2015 at 1:48 PM, Peter Attia <████████████████████████████████> wrote:

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