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In page Cachexia:

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Accurate epidemiological data on the prevalence of cachexia is lacking due to changing diagnostic criteria and under-identification of people with the disorder.[1] It is estimated that cachexia from any disease is estimated to affect more than 5 million people in the United States.[2] The prevalence of cachexia is growing and estimated at about 1% of the population. The prevalence is lower in Asia but due to the larger population, represents a similar burden. Cachexia is also a significant problem in South America and Africa.[1]