A mixture of soy powder and flour is more nutritious. If you eat 4 times a day, each time you should intake 6.25 grams of soy protein, and the food consumed each time must contain less than 1 gram of saturated fat and less than 20 milligrams... The mixture of soy powder and flour is more nutritious. There are two nutritional benefits of food made from a mixture of soy powder and flour: one is that the addition of soy powder increases the protein content of flour-based foods.