When I was first diagnosed with cancer several people recommended I get an expensive alkaline water machine including a former GP. I spoke to suppliers at a Festival and they were convincing. There were many claims also on the internet about how alkaline water can help weight loss, detoxification, pH balance, bone health, hydration, heart health, energy levels and even claims around cancer - it is said that cancer cells can no longer develop in an alkaline environment.
I bought pH strips for a few quid to test my urine, thinking this might help inform my decision - but I had nagging doubts. I couldn't see how it could work.
The pH scale is how you measure acidity; zero being the most acidic and 14 being the most alkaline. A pH level of 7 is neither acidic nor alkaline. The human body apparently has a controlled pH level of about 7.4 - but levels vary in certain parts of the body. The stomach needs to be acidic between 1.35 and 3.5 to break down food and it seems urine is also naturally acidic.
It seems to me if a person drinks alkaline water it may increase pH, but only very temporarily - as it goes through the stomach it is surely impacted by digestive juices so that the contents all have the same pH? Since most uptake of water happens in the intestines, the water that enters the bloodstream will have the pH of the small intestine digestive juices rather than the pH present at the time of drinking. So how can alkaline water impact?
So it seems consuming alkaline water has little effect on changing the pH of the blood, but a few studies have also looked at the effect of alkaline water or diet on the development or progression of cancer. Very Well Health report on 'a large systematic review (combining 252 abstracts) looking at alkaline water and cancer' that 'there did not appear to be any evidence that consuming this water had any effect on the initiation (development) or treatment (progression) of cancer. In only one of the studies was any significant association found, and that, in turn, was slight (between pH and bladder cancer)....A Finnish study looking specifically at men with bladder cancer and an alkaline diet, however, found that a lower urine pH (reflective of the alkaline measures) did not significantly reduce the risk of developing bladder cancer.'
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