Nutrition, Immunity and Infection

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Abstract
In attempting to define the cause of the decline in premature mortality which has occurred during the past 200 years in countries which are now developed, one clear direction of investigation is to draw comparisons with parts of the world which remain underprivileged. If we understand which environmental factors are responsible for the continued high levels of early mortality in such countries, it should be possible to identify which aspects of socioeconomic development have helped to reduce the problem.Clearly, one of the major differences between the developed and developing world is in nutrition and nutritional status. Food availability for the majority of people in developing countries is at best marginal, and chronic undernutrition throughout life is often the norm.

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