Does this mean that Lex and all the others eating the same muscle meat and fat do not digest the specific raw food? What about all those eating pemmican or cooked muscle meat and fat for years on end?
I believe that some people do need to eat the same food every day. I believe that other people need to vary their diet somewhat. I think I am of the latter group. I've never lived any length of time on just (raw) meat or had more than half a bite of pemmican at a time, so I can't be sure though.
I know we are not cats, but one of my cats will only eat (raw lean) bison muscle meat and nothing else, but in a real pinch may eat (raw) pork), (raw) chicken, interstitial fluid, blood, sardine juice or freerange canned catfood nothing else! She will only eat other than (raw) buffalo (muscle) if she hasn't had other food around that she will eat in a couple of days. You probably know cats' livers degrade if they haven't eaten in twenty-four hours. She obviously has a very real aversion to other than the bison. She will not touch (raw) beef no matter how long she hasn't eaten. My other cat will eat all the above, yogurt, honey, eggs, butter, cream, kefir and cheese "no questions asked".
I've seen it in people though too, even if in the same families. I've always been the one that needed variety. My only exception was doing Living Food LifestyleTM. I could eat the same concoction of energy soup meal after meal, month on end, no desire for other food. Problem was it made me have "pins and needles" constantly all over and look like I was from The Planet Bloodorange with black painful veins. Also, if I couldn't have my food, I had a paining and strange looking reaction right away.
In some poor regions people only eat rice and water.
Eat what makes you feel best. If any raw food makes you feel best, I can't see how it could be wrong, as long as it isn't dry beans or something like that. Is there an animal that lives on that?