The pH of water is neutral, around pH 7. Chemicals and gases  change this and make it  acidic or  alkaline. The pH of rainwater is slightly lower than neutral due to the presence of carbon dioxide from the air, which increases acidity. 
The pH of acidic substances is less than 7.0 to zero. Vinegar has a pH of  3, lemon juice has a pH of 2, and battery acid has a pH of 1. The pH of alkaline substances is up to 14. Baking soda has a pH  between  8 and 9, and magnesia milk has a pH between  10 and 11. The pH of water can be high or low, but if it is too high or too low, it can be detrimental. Water that is too alkaline has a bitter taste. It can cause deposits that overhang pipes and equipment. Strongly acidic water can attack or  dissolve metals. 
Benefits of  Alkaline water has become more popular in recent years because it is believed to be beneficial to health. Bone Health and Osteoporosis Several studies have been conducted on the effects of alkaline intake on bones. Studies published in bone have found an effect on bone resorption. Bone resorption is the process by which old bone cells are broken down and replaced by new bone cells. 
 Low bone resorption and high mineral density improve bone strength.  The authors conclude that "alkaline mineral water rich in bicarbonate and calcium reduces bone resorption more than  acidic mineral water rich in calcium." But this was a small effect.Scientists sought further research to see if the benefits of reducing bone resorption were long-term and could improve bone mineral density.  Another study, published in the Nutrition Journal, compared the effects of  acidic diets rather than alkaline water on osteoporosis, which is characterized by weak and brittle bones. While examining the background of the study, the author noticed numerous claims  made on the Internet. These claims suggest that "commercial products associated with an alkaline diet neutralize acidity and  help the body regulate its pH levels, thereby preventing the process of illness. Also alkaline. We conclude that diets, supplements, or salts do not prevent osteoporosis. 
 According to a review of a study published in 2012, an alkaline diet increases urinary alkalinity and reduces urinary calcium. It turns out that it is possible. However,  researchers did not expect this to reflect total calcium levels, and  no evidence was found that this would improve bone health or  prevent osteoporosis.

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