HAP TER 1 Nutrition in Nursing Malnu Frequent inection altered GI function FIGURE 1.3 Factors that may be involved in the otiology of illness-related malnutritio Body Mass Index QUIG K BITE Body mass index (BMI) is an index of ody Mass Index person's weight in relation. to height use index of weight in lation to height that to estimate relative risk of health problem calculated mathemat Interpreting BM related to weight. Because it is relative ally bydviding weight