buckwheat nutrition facts and nutritional information. 1. Calories: quinoa - 7% more than buckwheat. Lose weight by tracking your caloric intake quickly and easily. Buckwheat has 13.25 g protein per 100g. Effect of Preparation and Storage on carbs The level of carbs can be affected by the method of storage for example canned or frozen and also by the method of preparation for example either raw, cooked or fried.