Among the most common diseases are those associated with polluted drinking water: typhoid, hepatitis, dysentery, cholera, and various types of cancer. The chief causes of death are, in order of frequency, disorders of the cardiovascular, respiratory, and digestive systems and infectious and parasitic diseases. A study published in the Lancet in 2019 found that there were 892 diet-related deaths per 100,000 people a year, the highest number in the world.
