What are the reasons for getting an upset stomach from overseas water? 【Basic Knowledge】
Have you ever experienced stomach pain or frizzy hair while abroad? The cause was the hardness of the water!
■Why can drinking water abroad cause stomach issues? Japanese tap water is soft, but in many countries overseas, the water is hard and contains high levels of minerals like calcium and magnesium. Magnesium is not absorbed much in the intestines, and the portion that remains in the intestines has the effect of drawing in water (osmotic effect), which makes Japanese people, who are not accustomed to hard water, more prone to stomach pain and diarrhea. ■Why does hair become frizzy after showering abroad? The calcium and magnesium in hard water combine with soap components to create insoluble soap scum. When this residue remains on the hair and scalp, it negatively affects the texture after washing, making the hair feel rough and frizzy. ■What should you be careful about when choosing mineral water abroad? Since many mineral waters sold overseas are hard, it is recommended to check the hardness on the label when purchasing. According to Japanese standards, water with a hardness of 100 mg/L or more is considered hard, and the higher the value, the greater the burden on the stomach and intestines.
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