A BMI under 18.5 is considered unhealthy. There is risk that you are not getting sufficient nutrition (malnutrition). Complications of malnutrition include anemia, nutrient deficiency, heart irregularities, loss of menstrual periods in women (amenorrhea), cavities, and osteoporosis.
ByHealthwise Staff Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine Brian O'Brien, MD, FRCPC - Internal Medicine Kathleen Romito, MD - Family Medicine Martin J. Gabica, MD - Family Medicine Specialist Medical ReviewerRhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator