The Lion Diet is an extreme elimination diet that typically includes only ruminant meat (usually beef), salt, and water, and is used by some people with autoimmune conditions as a way to identify food triggers and reduce inflammation. Some individuals report improvements such as reduced joint pain, better digestion, clearer skin, and fewer autoimmune flare-ups, likely because it removes common inflammatory triggers like gluten, dairy, plants, and processed foods. The proposed mechanism is a strict elimination effect, where the immune system may calm down once potential food antigens are removed, but this evidence is mostly anecdotal and not strongly supported by long-term clinical studies. Potential benefits include symptom reduction, simplicity, and easier identification of trigger foods, but risks include nutrient deficiencies (vitamin C, fiber), gut microbiome imbalance, cholesterol concerns, and long-term sustainability issues. While some people may see short-term relief, medical experts generally recommend it only as a temporary elimination strategy under supervision, followed by careful food reintroduction to build a more balanced long-term diet.