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> There's hundreds of thousands of people currently having success with low carb diets

There's hundreds of thousands of people currently having success with no-shellfish diets to manage their shellfish allergy; yet these people don't go around using words like "reversed" or "cured" in reference to their allergy, the way keto people do with insulin resistance. And most of those keto people having apparent success would fail an OGTT (a test that actually measures insulin sensitivity, unlike fasting BG/insulin or HbA1c) if they took one.