Vitamin supplementation adherence
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Vitamin Supplementation Adherence: Key Populations and Influencing Factors
Adherence to Vitamin D Supplementation in Infants and Children
Adherence to vitamin D supplementation guidelines in children under five is generally poor, with reported rates ranging from as low as 14% to as high as 96%, but most studies indicate low to moderate adherence overall. The main challenges include inconsistent implementation of guidelines, varying definitions of adherence, and methodological differences across studies. There is a clear need for more effective health promotion interventions to improve adherence and reduce the risk of vitamin D deficiency in this age group .
Across Europe, national policies for infant vitamin D supplementation are common, but adherence varies widely. Good adherence (≥80% of infants) is reported in 59% of countries, while the UK reports the lowest rates (5–20%). Factors that significantly improve adherence include universal supplementation regardless of feeding mode, providing information at neonatal discharge, financial support for families, and regular monitoring of adherence during child health visits. These findings highlight that successful adherence requires a multi-faceted approach, including early education and ongoing support .
In Ireland, high initiation rates of vitamin D supplementation at birth have been observed, with 92% of infants starting supplementation. However, only 30% of parents fully adhered to the policy of daily supplementation for the first year, and 16% were broadly compliant. The main barriers to full adherence were frequency and duration of supplementation, despite high awareness of the policy among parents 58.
Adherence in Special Populations: Bariatric Surgery Patients
After bariatric surgery, lifelong vitamin and mineral supplementation is recommended, but adherence is variable. About 60% of adults maintain high adherence two years post-surgery, but 15% discontinue calcium-vitamin D and 12% discontinue B12 supplementation. Factors associated with low adherence include younger age, side effects, mental health issues, and lack of regular medication use before surgery. Despite these challenges, biochemical deficiencies are rare, except for a 10% prevalence of anemia, suggesting that tailored follow-up and support strategies are needed to maintain long-term adherence .
In adolescents who have undergone bariatric surgery, adherence to vitamin supplementation is also generally poor. However, there is a strong correlation between self-reported adherence and measured vitamin D levels, indicating that self-reports are reliable. Key factors influencing adherence include personal capacity and social support, emphasizing the importance of individual capability and external encouragement .
Long-term follow-up (12 years) after Roux-en-Y gastric bypass shows that adherence to supplementation reduces the risk of vitamin and mineral deficiencies, but does not eliminate it. Even among those who report adherence, sub-optimal vitamin D levels are common, highlighting the need for ongoing monitoring and possibly higher supplement doses .
Adherence in Older Adults and Nursing Home Residents
In Danish nursing homes, adherence to vitamin D and calcium supplementation recommendations is low, with only 8% of facilities achieving high adherence (>80% of residents). Barriers include lack of prescription by general practitioners, resident refusal, swallowing difficulties, and the high number of tablets required. Despite high awareness of the recommendations among staff, ambiguity about responsibility and practical challenges hinder implementation. Addressing these barriers is essential to improve adherence in this vulnerable group .
A study in older adults on long-term statin therapy found that monthly vitamin D supplementation did not improve overall adherence to statin use, but did improve persistence with therapy over 24 months, especially for those on simvastatin. This suggests that vitamin D supplementation may have a role as an adjunct to support medication persistence in older adults .
Monitoring and Improving Adherence: New Technologies
Accurate monitoring of adherence is crucial for both clinical care and research. A pilot study comparing traditional methods (pill counts, electronic diaries) with smartwatch-based monitoring found that smartwatches provided consistent and objective adherence data over time. This technology may offer a more reliable way to measure and support adherence to vitamin supplementation regimens .
Conclusion
Adherence to vitamin supplementation varies widely across populations and settings. In infants and children, adherence is often suboptimal, with better outcomes linked to universal policies, early education, financial support, and regular monitoring. Among bariatric surgery patients and older adults, adherence is challenged by personal, social, and practical factors, but can be improved with tailored support and follow-up. In institutional settings like nursing homes, addressing systemic barriers is key. Emerging technologies, such as smartwatch-based monitoring, may enhance the accuracy of adherence measurement and support interventions. Overall, improving adherence to vitamin supplementation requires a combination of policy, education, support, and innovative monitoring strategies 1234+6 MORE.
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