Mythbuster
Acid-Base Diets Prevent 'Over-Acidification' of the Body Through Food.
Summary
Acid-base diets cannot change the blood pH value in healthy people because kidneys and lungs buffer it strictly between 7.35 and 7.45. Nutrition only influences urine pH – therefore, a plant-based diet with plenty of potassium and fiber makes sense, not "de-acidification".
Mythbuster: Acid-Base Diets Prevent 'Over-Acidification' of the Body Through Food.
The Myth
Acid-Base Diets Prevent 'Over-Acidification' of the Body Through Food.
What the Evidence Says
The blood pH value is kept extremely strictly between 7.35 and 7.45 by complex buffer systems of the kidneys and lungs. Although nutrition changes the pH value of the urine, it has no influence on the systematic blood pH value in healthy people.
Practice: Concrete Implementation
The myth doesn't help you, but the physiology behind it does: Your body keeps the blood pH value stable via kidneys and lungs – regardless of whether you are eating a steak or an apple right now. What you can sensibly control is the acid load of the diet (potential renal acid load, PRAL) and its indirect effects: potassium, magnesium and fiber intake, bone health, muscle mass. This is exactly what you build your everyday life on – not on "alkaline powders" or "de-acidifying" teas.
Example A — Weekly Plan (Lower Acid Load, Without Dogma)
Goal: more base-forming foods (fruit, vegetables, legumes), moderate acid-forming foods (meat, cheese, grains) – not forbid, but shift.
| Meal | Base-Loading (Example) | Neutral/Moderate (Example) |
|---|---|---|
| Breakfast | Oatmeal + Berries + Yogurt | Scrambled Eggs + Whole Grain Bread |
| Lunch | Lentil Stew + Large Salad | Chicken + Rice + Vegetables |
| Dinner | Roasted Vegetables + Herb Quark | Pasta with Bolognese + Salad |
| Snack | Fruit, Nuts, Vegetable Sticks | Cheese Cubes, Whole Grain Crackers |
Rule of thumb: 2/3 of side dishes plant-based, 1/3 animal/grain – this lowers the PRAL noticeably, without sacrificing calories or protein.
Example B — Execution & Coaching Cues
- Cue 1 – "Vegetables First": At every main meal, put the plant-based component on the plate first, then protein/carbohydrates. This increases potassium and fiber – the relevant levers.
- Cue 2 – "No Alkaline Powder Needed": If someone fears "over-acidification": blood pH is buffered. Instead, check if enough fruit/vegetables (≥ 400 g/day) and potassium (approx. 3,500 mg/day) are included.
- Cue 3 – "Urine pH is Not Blood pH": Test strips only show renal acid excretion – not a health score. Do not use as a control instrument.
- Cue 4 – "Consider Context": In kidney disease, osteoporosis risk or certain medications, the acid load is medically relevant – then clarify with a doctor, do not "de-acidify" yourself.
Example C — Microcycle (7 Days, Everyday)
| Day | Focus | Concrete |
|---|---|---|
| Mon | Base-Loading | 2 vegetarian main meals, 1 portion of fruit |
| Tue | Protein Emphasis | Meat/Fish + double vegetable side dish |
| Wed | Legumes | Lentils/Chickpeas as main protein |
| Thu | Base-Loading | Large salad as base, add egg or tofu |
| Fri | Flexible | "Normal" food, but do not omit vegetable side dish |
| Sat | Potassium Focus | Include potatoes, banana, spinach, avocado |
| Sun | Reset | Use leftovers, 1–2 plant-based meals |
Ideal: Daily ≥ 400 g fruit/vegetables, 2–3 legume portions/week, keep an eye on potassium, no alkaline powder needed.
Good Enough: 5 out of 7 days one more plant-based side dish than before – even that lowers the acid load and improves nutrient density.
First Step: Add an extra portion of vegetables or fruit to one meal today and remove the alkaline powder from the shopping cart.
Continue at the source
Read the original sourceFAQ
Can I "over-acidify" my blood pH through diet?
No. In healthy people, buffer systems (bicarbonate, kidneys, lungs) keep the blood pH value extremely stable between 7.35 and 7.45. Nutrition changes the pH value of the urine, not that of the blood. An "over-acidification" in the sense of a shifted blood pH value does not arise through food.
What is the potential renal acid load (PRAL) and is it relevant?
The PRAL estimates how strongly a food increases (positive) or decreases (negative) acid excretion via the kidneys. Fruit, vegetables and legumes usually have negative values, meat, cheese and grains positive. It is mainly relevant for people with kidney disease or osteoporosis risk – in healthy people it is not a health score, but an indication of nutrient density.
Do alkaline powders or "de-acidifying" teas help?
For healthy people with a balanced diet, there is no robust evidence that they improve blood pH value or health. The effective lever is the diet itself: more fruit, vegetables and legumes provide potassium, magnesium and fiber – this supports bones and muscle mass, regardless of "de-acidification".