Individuals suffering from anorexia or bulimia have an intense fear of becoming obese.  They either refuse to eat to the point of starvation or they eat and make themselves vomit immediately afterward.  This typically appears during adolescence and is more predominant in females.  Initially, anorexia nervosa was thought to be primarily of psychological origin; however, in the last few years, there is evidence to indicate that some cases of anorexia may be caused by a severe zinc deficiency....

Arthritis is inflammation of the joints.  It may appear suddenly or come on gradually. Moving the joint usually hurts; sometimes there is only stiffness.  Osteoarthritis and rheumatoid arthritis are the most common forms of arthritis.  Osteoarthritis is related to the wear and tear of aging and involves deterioration of the cartilage at the ends of the bones.  The cartilage becomes rough; the tendons, ligaments, and muscles holding the joint together weaken; and the joint itself becomes deformed, painful, and stiff.  Osteoarthritis rarely develops before the age of forty.  It typically runs in families, afflicting nearly three times as many women as men....