Haven't specifically looked at the warrier diet, foods allowed etc., but I think it is basically Paleo with the addition of a 20/4 intermittant fasting protocol, that is a fasting period of 20 hours (including sleep) and a 4 hour eating window.
This is basically what I do,
It is important to include a large variety of foods in this eating window as this is the one and only meal time/day.
The other thing to consider is allowing your body plenty of time to adapt, so gradually making breakfast later and later, till it becomes lunch, then making lunch later and later till it becomes dinner.
There are many potential benefits which include improved glucose control which IMO is at the core of many chronic diseases, but the warning is to go slow, real slow, don't get ahead of yourself, many people go too fast feel great for a while then start going downhill, this is because their bodies have not fully adapted and the body has enacted a series of metabolic adjustments to deal with the food restriction and one of those may be downregulating thyroid function.
You should go in with the idea of nudgeing your body in the right direction, not enforcing a strict regimen, your body is in charge and if you push too hard it will counter move and sabotage your process, so keep it slow and comfortable.
I would suggest a minimum of three months, preferably closer to 12 months of eating better and drifting slowly to a 20/4 IF protocol.
I am just an interested individual trying to crack the autoimmune nut.
Partner has Graves Disease, 5 years, showing good test results, looking forward to potential remission in the near future.
3 friends have MS, 1 just recently diagnosed, severity 7/10.