The answer is yes. Mushrooms are perfectly okay to consume on a keto or low-carb diet. They are low in calories, carbohydrates, and fat. A cup of raw mushrooms contains 2.2 grams of protein, 2.3 grams of carbs, and 0.7 grams of fiber, resulting in just 1.6 grams net carbs. They also contain a modest amount of useful minerals such as potassium and magnesium.