During the past three decades, from 1990 to 2019, there was an overall decreasing trend in the prevalence of vitamin A deficiency and iodine deficiency but an increasing trend in the prevalence of protein-energy malnutrition worldwide although great differences existed across different regions and populations [ 7 , 8 , 9 ].
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Temporal Trends in Incidence of Nutritional Deficiency among Older Adults in China: A Secondary Analysis of the Global Burden of Disease Study 1990-2019.
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