This document discusses different types of nutrition problems including undernutrition, overnutrition, and protein-energy malnutrition. It defines undernutrition as not receiving enough nutrients, and explains that being underweight, stunted, or wasted are conditions of undernutrition. Protein-energy malnutrition is described as a severe form of undernutrition that can manifest as marasmus from low food intake or kwashiorkor from lack of protein. Overnutrition is defined as being overweight or obese, which increases risks for health problems like heart disease and diabetes.