Vitamins are essential for the body and are generally perceived as beneficial. Numerous studies show that certain vitamins can help prevent cancer and other serious diseases. However, the body cannot produce vitamins on its own; they must be obtained from external sources, mainly through food.
The saying “more is better” doesn’t always apply to vitamins. Overconsumption, especially through supplements, can lead to serious health consequences. One alarming side effect of certain vitamins is an increased risk of lung cancer. Understanding the underlying mechanisms and the warnings from experts is crucial.
Vitamins: Overconsumption Increases Cancer Risk
A nutrient-rich diet is, in general, a healthy way to reduce cancer risk. For instance, daily Vitamin D intake could potentially lower cancer mortality rates by up to twelve percent, as reported by the German Cancer Research Center.
However, not all vitamins behave like Vitamin D. For many years, there was hope derived from the antioxidant properties of certain vitamins, suggesting that higher intake could prevent cancers. Yet, experts argue that evidence supporting this is lacking; many of the mechanisms and effects of antioxidants in the body are still unclear.
The German Cancer Society recommends vitamin supplements only when specific circumstances arise, such as pregnancy or certain diseases impairing nutrient absorption in the gastrointestinal tract. In Germany, only a few vitamins and minerals fall into this category, emphasizing the risks of overconsumption, which could even elevate cancer risk.
Lung Cancer: This Vitamin Increases Risk
A study published in 2019 highlighted an increased risk of lung cancer associated with high doses of Vitamin B12, according to warnings from the cancer society on their website. It’s essential to understand that Vitamin B12 itself doesn’t cause cancer; however, very high doses can promote the growth of pre-existing cancer cells. As such, the German Cancer Society suggests checking the serum Vitamin B12 levels before considering supplementation.
Photo: Aleksandr Grechanyuk, adobe.stock
Another study published in the Journal of Clinical Investigation in 2023 suggests that the risk of developing a malignant lung tumor can be enhanced by the additional intake of vitamins. This includes vitamins A, C, and E—commonly known antioxidants. While these vitamins are essential for skin, teeth, gums, bones, and blood vessels, they might also activate mechanisms that support cancer cells.
Cancer Risk: How Vitamins Facilitate Tumor Growth
According to the study, cancer tumors can use vitamins to create new blood vessels, allowing them to receive better nutrient supply and grow more rapidly. However, the antioxidants found in regular food, such as fruits and vegetables, pose no problem. In contrast, it is highly recommended to avoid vitamin supplements like pills or fortified drinks, especially since many manufacturers prioritize marketing over truthfulness.
