Whether the individual is age six, thirty-six, or sixty-six; the complications of undereating are disturbing: bradycardia (abnormally low resting heart rate), A-fib, congestive heart failure, dangerous electrolyte imbalances, hair loss, cognitive decline, forgetfulness, sleep problems, depression, gastroparesis (paralysis of the digestive system), lack of menstrual cycles in women, infertility, weakened immune systems, osteoporosis, liver disease (hepatitis), pancreatitis, kidney failure, GERD (gastroesophageal reflux disease), bloating, feeling cold, high cortisol levels, elevated cholesterol, abnormally low blood pressure, high blood pressure. . .just to name a few.