infectious diseases can delay growth, particularly when coupled with: technologies introduced by western culture. too much protein consumption. poor nutrition. adequate vitamin d. humidity.

Parasitic infection because a parasitic disease, also known as parasitosis,  and aninfectious disease caused or transmitted by aparasite. Many parasites do not cause diseases.Parasitic diseases can affect practically all living organisms, including plants and mammals.
The study of parasitic diseases is called parasitology.

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In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.