The standard diet nowadays is packed with processed foods full of chemicals and toxins that contain either too much sugar or salt. In addition there is the rising trend of mass-production and availability of genetically modified foods, something that has caused uproar in almost every first world country.
All of these foods are so different from anything older generations ate that our great-grandparents would not even recognise them as actual food. Some say that we do not eat food in today’s society; we eat food-like products. Eating too much processed food is not good for anyone’s health, and cancer survivors should avoid processed foods and food high in sugar where possible.
There are, however, some very persistent myths surrounding cancer and its causes; one of which is that  overly ‘acidic’ diets cause your blood to become ‘too acidic’, which can increase your risk of cancer.
This is biological nonsense. True, cancer cells can’t live in an overly alkaline environment, but neither can any of the other cells in your body.

Blood is generally slightly alkaline. and this state is strictly regulated by the kidneys within a very narrow and perfectly healthy range. It cannot be altered for any meaningful amount of time by what you eat, and any extra acid or alkali is simply excreted in urine.
To maintain the correct balance within the body, your urine can and does change pH, depending on what you’ve eaten (explained in detail in this post). This can be seen by testing urine pH (acidity) after eating different foods and is the basis of the mistaken belief that diet can “make the body alkaline”. But that’s all you’re changing, and anyone who claims otherwise simply doesn’t understand how the body works.
While eating lots of green veg is certainly healthy, that’s not because of any effect on how acid or alkaline your body is.
There is something called acidosis. This is a physiological condition that happens when your kidneys and lungs can’t keep your body’s pH (a measure of acidity) in balance. It is often the result of serious illness or poisoning. It can be life-threatening and needs urgent medical attention, but it’s not down to overly acidic diets.
The immediate environment around cancer cells (the microenvironment) can become acidic due to differences in the way that tumours create energy and use oxygen compared with healthy tissue. Researchers are hard at work trying to understand how this happens, in order to develop more effective cancer treatments.
Quite simply; There is no compelling evidence to prove that diet can manipulate whole body pH, or that it has an impact on cancer.
Source: Cancer Research UK
 
 

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