Does an alkaline diet change your body's pH?
Published 26 August 2026
Hello! Wednesday is our “Knowledge Day”—once a week, we share an informative article to get you thinking, which will help you make more informed choices.
This time, Anette Auväärt writes about an alkaline diet. Social media recommends starting your morning with “miracle water” and promises that an alkaline diet will reduce inflammation in the body, slow down aging, and some even claim it helps fight cancer. But can food actually change the body’s pH?
What exactly is the body’s pH?
“The body’s pH” isn’t a single number. The body consists of many separate environments, and each has its own pH, which the body regulates itself: in the stomach, it’s approximately 1–3 (and it needs to be acidic so that proteins can be digested), while blood remains within a very narrow range of 7.35–7.45, meaning it is naturally slightly alkaline.
In a healthy person, a normal diet does not significantly alter blood pH—the lungs, kidneys, and buffer systems keep it stable. Diet actually has the greatest impact on urine pH, and more alkaline urine does not mean better health.
Where does the distinction between “acidic” and “alkaline” come from?
Foods are not classified based on how alkaline they are chemically, but rather by their PRAL (potential renal acid load)—which estimates how much acidic or alkaline waste the kidneys must remove through urine after digestion. The system was created to assess the acid load on the kidneys, not the entire body—and the lists circulating online often do not consistently follow this principle.
In this article, you’ll learn why shifts in blood pH are dangerous in both directions, what urine pH actually affects (such as kidney stone formation), why an alkaline diet can still improve your well-being — but for a completely different reason than is claimed — and why there is no clinical evidence that it cures cancer.
How can you tell science apart from marketing?
At the end of the article is a short checklist you can use for every upcoming diet trend: when to be skeptical of an advisor’s promises and what two questions to ask yourself when you come across a new “miracle solution.”
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About the Author
Anette Auväärt is a food and biotechnology student at TalTech. Her interest in nutrition began during the COVID-19 pandemic, when she developed a desire to better understand how daily food choices affect health, well-being, and productivity. Over time, this evolved into a desire to gain a deeper understanding of how the human body works and to learn how to distinguish science-based information from common myths—which is precisely what led her to study food and biotechnology. On her blog, Anette shares science-based and practical information to help readers distinguish facts from myths and make more informed choices.
Enjoy the read—and it’s worth putting more fresh fruits and vegetables on your plate even without a miraculous explanation!
