Yes, Old Bay seasoning is suitable for a keto diet. The ketogenic, or keto, diet is a low-carb, high-fat diet. According to the USDA FoodData Central Database, Old Bay seasoning contains 0 grams of net carbs (which is total carbs minus fiber) per teaspoon. Since the recommended daily intake for a keto diet is typically under 30 grams of net carbs, Old Bay seasoning can easily fit within these parameters.