A fan asked via our backend: "My grandfather passed away last week from bladder cancer. I was by his side during treatment and saw how much he suffered. Cancer is truly terrifying. I'm afraid of getting it myself, so I want to prevent it properly. I read online that taking vitamin E can prevent cancer. Is that really effective?"
As common and essential nutrients in daily life, vitamins have seen their benefits increasingly explored in recent years, with various vitamin supplements gradually becoming the public's "health elixirs."
Lowering blood pressure, promoting growth, combating aging, preventing tumors... Vitamins seem to do it all. But do they truly possess such powerful effects?
Why does the human body need vitamins?
Many people know the body requires vitamin supplementation but don't understand why. In reality, vitamins are essential organic compounds for human metabolism.Metabolism requires enzymes, whose activity depends on coenzymes. Many vitamins serve as components of enzymes or coenzymes. It is precisely through vitamins that the body maintains normal metabolic processes and regulates bodily functions.
Deficiencies in different types of vitamins can lead to distinct adverse effects.
Vitamin A functions to maintain vision and promote the proliferation and differentiation of epithelial tissues. Long-term vitamin A deficiency weakens tooth enamel, increasing susceptibility to cavities. For children and adolescents, vitamin A deficiency directly causes delayed bone growth, stunted height development, and reduced potential for reaching full height.Deficiencies in vitamins B1 and B3 can cause gastrointestinal symptoms like indigestion and lead to neuritis. Lack of vitamin B2 affects hair, nail, and skin growth, often resulting in mouth ulcers. Vitamin C is crucial for immune function. Long-term deficiency may cause scurvy and hemorrhagic disorders.Additionally, as resistance declines, illnesses like colds occur more frequently—which is why cold sufferers often supplement with vitamin C.
Vitamin D primarily regulates the metabolism of trace elements like calcium and phosphorus in the body. It promotes calcium and phosphorus absorption in the intestines, facilitates bone calcification, and maintains blood calcium and phosphorus balance. Insufficient vitamin D intake can cause symptoms like rickets, osteomalacia, and osteoporosis.
Individuals deficient in vitamin E may experience dry, split ends, dull complexion, and dark spots. Furthermore, long-term vitamin E deficiency can lead to muscle weakness, as vitamin E protects muscle tissue from free radical damage and enhances muscle resilience.
Vitamin Benefits: Fact or Fiction?
Different vitamins support distinct aspects of health, maintaining the daily metabolic functions and operations of multiple organs.Vitamin deficiencies can lead to numerous diseases, underscoring their undeniable importance. However, many exaggerate vitamins' efficacy, touting them as "miracle cures" capable of anything—even claiming they prevent cancer.
A study published in the British Medical Journal on vitamin D found a negative correlation between plasma vitamin D levels and cancer risk.Consequently, many media outlets have heavily promoted vitamin D as a cancer preventative and treatment. The study followed over 3,000 cancer patients for 20 years and compared them with 4,000 healthy individuals, concluding that those with the highest plasma vitamin D concentrations had a 24% lower overall cancer risk. However, this research has limitations, and the follow-up results only indicate correlation, not causation.
Moreover, the study primarily utilized data from Japan, where vitamin D levels vary significantly across different regions. Currently, authoritative international bodies also acknowledge insufficient evidence to support vitamin D's anti-cancer properties.
Indeed, if vitamin supplementation could prevent or cure cancer, humanity might have eradicated the disease long ago. Therefore, we must view the role of vitamins through a scientific lens, avoiding blind faith in media hype that exaggerates vitamins as all-powerful "elixirs."
Vitamin Overdose Can Cause Toxicity
Many people now proactively purchase vitamin supplements for health maintenance.However, vitamins should not be taken indiscriminately. Excessive intake may cause severe adverse reactions or even poisoning, such as fever, hair loss, vomiting, muscle weakness, and in severe cases, life-threatening emergencies like massive hemorrhage. Therefore, while vitamin supplementation is beneficial, certain precautions must be observed.
Pay attention to dosage: Vitamins are not mere supplements; like other medications, they require careful dosing to avoid adverse effects from overconsumption.
Be aware of side effects: Vitamin B1 and K have been reported to cause severe allergic reactions, including fatalities. Cases of anaphylactic shock from vitamin B12 have been documented. Individuals allergic to specific vitamins must be particularly cautious about their intake methods.
Store scientifically: Keep different vitamins stored separately to prevent interactions.Additionally, vitamins like D and B2 are light-sensitive and should be stored in amber bottles to shield them from ultraviolet light.
Vitamins are essential nutrients for our bodies, and within this diverse family, each vitamin has distinct functions and deficiency symptoms. However, avoid excessive intake. Maintain a balanced diet to ensure consistent and adequate vitamin consumption.