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Researchers have found a link between Vitamin D levels and C-reactive protein (CRP, a marker of inflammation) in older adults, suggesting that maintaining sufficient Vitamin D could help reduce inflammation and prevent chronic diseases. This association persisted even after controlling for factors like physical activity, smoking, obesity, education level, kidney function, biological sex, and age.
Aging experts from Trinity College Dublin and the University of Limerick have demonstrated correlations between levels of vitamin D and C-reactive protein (CRP, an indicator of inflammation) in the elderly.
The study was recently been published in the journal PLOS ONE.
Inflammation and CRP
CRP can be a blood measure of inflammation in the body. High levels can indicate infection while lower — but still higher than normal — levels can indicate low-grade inflammation. Scientists think that this low-grade constant inflammation (which is common in older adults) can lead to a slow accumulation of damage and be a major risk factor for many of the chronic diseases of aging including cardiovascular disease, mental health decline, diabetes, etc.
Anything that could help decrease CRP levels in the blood may have a positive impact on chronic disease prevention.
Vitamin D
Vitamin D (‘Sunshine vitamin’) is needed for bone health and recently has been linked with immune function. Previous research from the Irish Longitudinal Study On Ageing (TILDA) has shown that 1 in 8 older Irish adults are deficient in the vitamin with those most at risk including the oldest, smokers, those with low household incomes, smokers, and those living with obesity.
Previous work from Professor Rose Anne Kenny and Dr. Eamon Laird has also reported on the association of vitamin D with COVID.
The new study used data from TILDA, and examined participants aged 50 years and over who were assessed at Wave 1 of the study and who provided measurement of vitamin D and CRP.
Key Findings:
The study finds that a deficient vitamin D status was associated with significantly higher CRP levels (inflammation).Having a sufficient vitamin D status reduced the risk of a high CRP level compared to being deficientThese findings remained even after adjusting for other factors such as physical activity, smoking and alcohol, obesity, educational level, kidney function, biological sex, and age.Overall, those who were younger, male, had tertiary education, not obese, a non-smoker, and had less than three chronic diseases had significantly lower CRP levelsFactors that increased the risk of high CRP levels included: included obesity, smoking, being female, physical inactivity, chronic conditions and poorer kidney function, and diabetes.These observations also provide reassurance for food policymakers that fortification of foods to increase levels of vitamin D could have the potential for health benefits and is not linked with adverse results for inflammation
Dr Eamon Laird, Lead author of the study, said: “This study is very important given the high prevalence of vitamin D deficiency and chronic disease in older adults living in Ireland. Our findings along with previous trials in this area suggest that optimizing vitamin D status to above deficient levels could help to benefit the inflammation pathway in community-dwelling older adults.
“Given that the FSAI just recently changed the vitamin D intake guidelines for older adults to 15ug per day (600 IU), our findings should provide further reassurance for policymakers to show that maintaining a sufficient vitamin D status is actually linked with lower levels of inflammation and did not increase the risk. Remember vitamin D is one component: in order to have the lowest risk of inflammation people should think about vitamin D in combination with regular physical activity, healthy lifestyle, adequate sleep, and social interactions.”
Reference: “Vitamin D status & associations with inflammation in older adults” by Eamon Laird, Aisling M. O’Halloran, Anne M. Molloy, Martin Healy, Nollaig Bourke and Rose Anne Kenny, 28 June 2023, PLOS ONE.
DOI: 10.1371/journal.pone.0287169
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