Eating well. New vitamin D guidelines

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 In 2024, Harvard Health Publishing and the Endocrine Society updated their guidelines on vitamin D supplementation, emphasizing tailored recommendations based on age, health status, and specific risk factors.

General Recommendations:

Adults Under 75: For healthy adults under 75, routine vitamin D supplementation beyond the Recommended Dietary Allowance (RDA) is generally unnecessary. The RDA remains at 600 IU (15 micrograms) daily for adults up to age 70 and 800 IU (20 micrograms) for those over 70. 

Adults 75 and Older: Supplementation above the RDA may be beneficial due to potential reductions in mortality risk. A daily intake of 1,000 IU is considered acceptable for this age group. 

Specific Populations:

Children and Adolescents (1-18 years): Empiric vitamin D supplementation is suggested to prevent nutritional rickets and potentially lower the risk of respiratory tract infections. 

Pregnant Individuals: Supplementation may reduce risks such as preeclampsia, intra-uterine mortality, preterm birth, small-for-gestational-age birth, and neonatal mortality. 

Individuals with Prediabetes: Supplementation might slow the progression to diabetes. 

Testing and Supplementation Practices:

Routine Testing: Routine testing for 25-hydroxyvitamin D levels is not recommended for the general population, including individuals with obesity or darker skin tones, unless there are specific indications. 

Supplementation Method: For adults over 50 requiring vitamin D supplementation, daily, lower-dose vitamin D is preferred over intermittent high doses. 

Safety Considerations:

Upper Intake Levels: The Tolerable Upper Intake Level (UL) for vitamin D is 4,000 IU (100 micrograms) daily for adults and children aged 9 and above. Exceeding this limit can lead to health risks, including hypercalcemia and kidney stones. 

These guidelines underscore the importance of individualized vitamin D intake, considering factors such as age, health status, and specific risk profiles. Consulting with a healthcare provider is recommended to determine appropriate supplementation tailored to individual needs.

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