Developing countries, such as Ethiopia, are areas where there is low technological advancement and poor standard of living. A major issue in these countries is malnutrition, which means they do not have access to enough nutrients for their bodies to perform all their normal functions and can lead to higher death rates. Often individuals in these countries live primarily on a single staple grain such as rice. Children living in these conditions will have similar characteristics such as extremely thin arms and legs. What key macromolecule might be missing from children in this condition?