Author Kim Jin-ho's Water and Health Story (73) The Key to Winter Health: Why You Should Pay Attention to 'Magnesium Water'

February 2026 is beset by a harsh cold wave. As we reach the tail end of winter, our body's immune system faces an extreme test.

As the flu and various mutant respiratory viruses surge, many people boil red ginseng and take expensive vitamins to boost their immunity.

In particular, as 'L.O.N.E.G.I.T.Y (longevity)' emerges as this year's wellness trend, the enthusiasm for proactively managing inner health is hotter than ever.

However, remarkably, many people remain indifferent to 'water,' which is the most fundamental basis for sustaining life, or even believe misconceptions about it as truth.

The key point we need to focus on is right here. Why is 'magnesium in water' the crucial key to winter health rather than countless nutritional supplements?

Reverse osmosis (RO) water purifiers used in many homes promise 'pristinely clean water with not a speck of dirt.' This is excellent technology that filters out 99.9% of contaminants, but the problem is that it also removes minerals essential to the human body, such as calcium and magnesium.

The World Health Organization (WHO) and experts call this 'Hungry Water.' This water devoid of minerals not only fails to quench thirst when consumed by the body but paradoxically extracts minerals from cells and bones in our body and expels them. The water essentially absorbs nutrients backward that the human body needs.

Recent medical research published in 2024-2025 warns more specifically about the dangers of such 'mineral-free water.'

In particular, research findings showing that children during growth periods who drink mineral-deficient water for extended periods may have elevated levels of 'homocysteine,' a toxic substance that threatens vascular health, are truly alarming. This means children's blood vessels can age prematurely.

On the other hand, mineral water containing appropriate levels of magnesium and calcium becomes an excellent natural supplement and guardian of health in itself.

So why specifically 'magnesium' this winter?

The answer lies in the secret relationship between magnesium and immune cells. According to the latest research from the University of Basel in Switzerland, T-cells, our body's frontline defense weapon against viruses, must activate a protein switch called 'LFA-1' to hunt viruses.

LFA-1 acts like a 'claw' that firmly grabs enemies when immune cells detect them, and the decisive key that operates this claw is magnesium.

When magnesium levels in the body are insufficient, T-cells fall into a helpless state where they cannot use the claw even when facing a virus and simply let the enemy slip away.

If you're concerned about winter immunity, a glass of water containing magnesium is more urgent than expensive tonics. Additionally, magnesium acts as a natural vasodilator, gently opening blood vessels that have constricted in winter's cold, regulating blood pressure and preventing cardiovascular diseases.

The saying "the harder the water (the more minerals it contains), the stronger the heart" is not merely a folk belief but a scientific fact proven by decades of epidemiological research.

Korea's tap water is safe and passes strict water quality standards while containing appropriate beneficial minerals for the human body. Rather than clinging to acidic mineral-free water due to vague anxiety, we need the wisdom to choose healthy water with living minerals.

When selecting bottled water at the supermarket, check the label on the back of the product. Choose 'drinking water' containing natural minerals rather than 'mixed beverages,' or using a mineral maker water bottle is also recommended. Choosing water with balanced calcium and magnesium content is the smartest investment for getting through winter 2026.

True wellness does not start with elaborate secrets but with the choice of a single glass of water you drink every day. Is the water I drank today water that fills my body, or is it hungry water that takes away my health?

Finding the correct answer to this question will be the most certain first step in protecting winter health.