Modern Healthspan|04. Juni
How Vitamin D Stops Your Telomeres Shortening | Dr JoAnn Manson
How Vitamin D Stops Your Telomeres Shortening – Insights from the VITAL Study (2025)
This episode discusses a groundbreaking publication from May 2025 in the American Journal of Clinical Nutrition. The main finding: Vitamin D supplements protect telomeres.
📊 The Key Result
- Telomeres shortened by only one year over four years in the vitamin D group, whereas they shortened by four full years in the placebo group.
- This represents about a 75% protection compared to the normal aging process.
🔬 Methodology of Telomere Measurement
- Telomeres were measured in leukocytes (white blood cells) from peripheral blood samples.
- The measurement is technically complex but was carried out in collaboration with an outstanding lab.
🧬 What Are Telomeres and Why Do They Shorten?
- Telomeres are the protective caps at the ends of chromosomes – similar to the plastic tips on shoelaces that prevent fraying.
- They consist of a repeating DNA sequence and protect chromosomes from degradation and damage.
- Their shortening is a biological aging process caused by constant cell division and turnover.
🩺 Telomere Length and Health
- Shorter telomeres are associated with a higher risk of age-related diseases, including:
- Cardiovascular disease
- Type 2 diabetes
- Osteoporosis and fractures
- For cancer, the relationship is more complex: Some cancers are more common with shorter telomeres, others with longer ones.
- Telomere length is considered a marker of biological aging, even though research has become more nuanced.
💡 Conclusion
Vitamin D might be a promising approach to extend healthspan and slow down the biological aging process – at least regarding telomere protection.
