I have an intolerance to tuna, turkey, sardines, and deer meat, and midly to beef and pork (blood test to find out). If he's intolerant to the meats he was eating, then inflamation would have gone down, and then he wouldn't feel so tired. If I eat tuna, I can't even focus my eyes for very long. And I feel like a ball of sleeping pills. So, maybe it isn't just meat but specific meats. Take our pork and beef for a few months, then add them back. Sometimes that's all it takes.