I don't generally agree with Ken Berry on this issue (due to the colon cancer, atherosclerosis, and other cancer risks of this diet) but a 90-day carnivore diet has a lot of advantages including weight loss and insulin resistance improvement, but also IBS and allergy symptom improvement since it is a kind of elimination diet.  [I know that few people on nostr respect my mainstream health advice, but I'll say my piece anyways].

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