Because tubers contain more moisture they have lower nutrient and energy density than cereals. The protein level of rice is similar to those of potato and yam on a dry weight basis but is the lowest among the cereals. Rice also has the lowest dietary fibre content. Utilizable protein was comparable in brown rice, wheat, maize, rye, oats and potato but was lower in sorghum and higher in millet.
Utilizable protein is highest for wheat and rice.