Your blood pH is not up for debate
Human blood is tightly regulated between a pH of 7.35 and 7.45. Your lungs (by adjusting how much CO₂ you exhale) and your kidneys (by adjusting what they filter out) keep it there — 24/7, automatically. If food could actually push your blood pH outside that range, you wouldn't feel "cleansed." You'd be in the emergency room with acidosis or alkalosis.
So what does change?
Your urine pH. That's it. When you eat lots of fruits and vegetables, your kidneys excrete more alkaline compounds and your urine trends more alkaline. When you eat lots of meat, eggs, and grains, your urine trends more acidic. This is just your kidneys doing their job — not evidence that your body has been "alkalized."
Peeing on a test strip and celebrating the color is not a health metric. It's a receipt.
The "acidic food causes disease" claim
Alkaline-diet marketing often claims acidic foods cause cancer, osteoporosis, or inflammation. There is no solid evidence for this. Cancer cells can grow in alkaline environments too — tumors even create their own acidic microenvironment regardless of what you eat. And the "acid leaches calcium from your bones" theory has been repeatedly tested and not supported by high-quality research.
Why people feel better on it
Because most alkaline diets tell you to eat more vegetables, fruits, nuts, and legumes, and less ultra-processed food, soda, and alcohol. That's just… a generally healthier diet. The benefit is real. The mechanism sold to you is not.
And "alkaline water"?
Your stomach sits at a pH of roughly 1.5 to 3.5 — strong enough to strip paint. Anything you drink is immediately neutralized on arrival. A $12 bottle of water at pH 9 hits your stomach and becomes… water. Save your money.
The takeaway
- Diet doesn't meaningfully change your blood pH — your body won't allow it.
- Urine pH changes are normal and not a health scorecard.
- Eating more plants is great. You don't need the alkaline framing to justify it.
- Skip the pricey alkaline water, drops, and test strips.