He doesn't really share the details of either his diet or his health with me. I would be surprised if he was doing it correctly and he also has plenty of preexisting health issues, so I'm not even attributing the changes to the diet.

I was familiar with "keto flu" from my in-laws experience with going keto, so I was expecting the initial illness he had. Now he's several months in and has clearly gained weight, as well as showing some new odd cognitive symptoms (almost pre-dementia type symptoms).