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美国密苏里河的两岸,一边是K州,饮用未经软化的河水(硬水),另一边是M州,饮用经软化的河水(软水)。在这两个州中,分别选择年龄、性别、居住年限、家庭情况相当,工作5年以上的共520人进行了各种有关的检查,并采取10％受检者家庭用水进行了分析。结果:M州软化水的钙和镁低,钠和钾高。而K州水的镉含量(3微克/升)比M州(1微克/升)高3倍。45～64岁男性白人总的心血管/肾病死亡率硬水区比软水区高30％。在饮食、血胆固醇、甘油三酯
Both sides of the Missouri River in the United States, on the one hand, are in the state of K, drinking unsalted water (hard water) and on the other hand M State, drinking softened water (soft water). In each of the two states, a total of 520 people, aged 5 years or older, having different years of age, sex, length of stay, and family status, were selected for various tests and analyzed using 10% of the subjects’ domestic water use. Results: M state demineralized water has low calcium and magnesium, high sodium and potassium. K state water has 3 times more cadmium (3 μg / l) than M state (1 μg / l). 45-64 year-old white male Overall cardiovascular / renal mortality Hard water area is 30% higher than soft water area. In the diet, blood cholesterol, triglycerides