Acid reflux - alkaline diet?

The growth of the Internet has enabled health myths to spread around the globe like a virulent strain of flu, infecting websites, books and the beliefs people hold about their health.

One of the most prevalent is the alkaline/acid diet myth. This seems to have come about as a result of an unfortunate marriage between Western alternative ideas about nutrition and Oriental concepts about the medicinal effects of foods. There is no evidence to support the idea that following a diet dictated by these notions can prevent any illnesses, cure any diseases or improve health in any way. The pseudo-scientific explanation of those who preach this doctrine talks about acid-forming and alkaline-forming foods (sometimes referred to as acid and alkaline foods for short).

One of the most confusing aspects is that an apparently arbitrary list of foods that supposedly makes your blood more acidic or alkaline. If you take fruits for example, citrus fruits are considered “alkalising” while cranberries and plums are considered “acidifying”.  This leads to statements like “lemons alkalise the blood”. In reality the chemistry of the blood is self-regulating and can withstand people consuming pints of orange juice or several antacid tablets in a day. These dietary recommendations have nothing whatsoever to do with whether the food has an acidic taste or contains any actual acids, such as citric acid or ascorbic acid. Or indeed, whether they a high or low pH.  An important scientific word has been seized and shaken it until it is unrecognisable.


This belief system is doubly confusing when it is used to advise people suffering from acid-reflux. Someone taking medicine aimed at neutralising their stomach acid, or reducing its production by the glands of the stomach, really does not need this muddle-headed pseudo-science thrown into the mix. Yet there are many books and websites that promote these dietary ideas to this group of patients.


Reflux is caused by a weakness of the valve at the top of the stomach and not by an imbalance of the pH of the blood. There is very little evidence that any particular foods have a consistent effect on reflux symptoms. The best way for an individual to check if something disagrees with them is to give up just one food at a time, eat normally, and then re-introduce the suspect food for a day and note any effects. Then, as with all good scientific experiments, repeat this procedure a few times to check that the effect is consistent.

Other than that, reflux patients should eat a high-fibre diet which seems to help, possibly because it keeps constipation and straining at bay. Straining, in someone with a weakened valve, will tend to push acid back up the oesophagus. The other important point is to eat a diet that prevents, or reduces any tendency to develop a bulging waistline. In this way pressure on that problematic valve will be kept to a minimum.