Zinc in health and chronic disease.

Zinc is a trace element essential for the optimal function of a variety of biochemical and physiological processes. Its role in healthy aging is particularly important as it prevents neo plastic cell growth, is involved in mitotic cell division, DNA and RNA repair. Although zinc is widely available in food, the daily intake in many persons may be suboptimal.

Acute and chronic arsenic toxicity.

Arsenic toxicity is a global health problem affecting many millions of people. Contamination is caused by arsenic from natural geological sources leaching into aquifers, contaminating drinking water and may also occur from mining and other industrial processes. Arsenic is present as a contaminant in many traditional remedies.

Whipple's disease.

Whipple's disease is a systemic bacterial infection and the common though not invariable manifestations are diarrhoea, weight loss, abdominal pain, and arthralgia. Arthritis or arthralgia may be the only presenting symptom, predating other manifestations by years. Virtually all organs in the body may be affected, with protean clinical manifestations.