Acid-Base Load: PRAL, NAE, and Why Your Diet pH Matters
Your body works to keep blood pH in a narrow range around 7.35 to 7.45. Diet does not change that pH directly, but it does change how hard your kidneys, bones, and muscles work to maintain it.
Dietary acid load, scored as PRAL or NAE, captures whether your eating pattern is making that buffering job easier or harder.
What this factor measures
PRAL stands for Potential Renal Acid Load. It estimates how much acid a food contributes to the kidneys after digestion, based on its protein, phosphorus, potassium, magnesium, and calcium content. NAE, Net Acid Excretion, combines PRAL with an estimate of organic acid production from total body size.
Values are expressed in mEq of net acid per day. A negative score indicates net alkaline. A positive score indicates net acid. Modern NZ diets typically run between +30 and +60 mEq per day, well into the acid range.
The target for most clients is a small positive or neutral load, achieved through fruit and vegetable volume rather than protein restriction.
Why it matters for body composition and longevity
Chronic high acid load drives the body to pull alkaline minerals, particularly calcium and potassium, from bone and muscle to buffer the load. Over years, that contributes to bone mineral loss and accelerated muscle protein breakdown, especially in adults over 50.
Kidney function declines faster under sustained high acid load. For NZ adults with reduced kidney function or family history, this is one of the more meaningful dietary levers.
For body composition, a high-protein diet without matching alkaline foods can quietly undermine the muscle preservation goal it was meant to achieve. The fix is not less protein. The fix is more vegetables alongside it.
What lifts the curve (and what flattens it)
High-acid foods: hard cheeses, processed meats, beef and lamb in large portions, eggs, white bread, white rice, and most grains. Soft drinks contribute through their phosphoric acid content. Alcohol adds further load.
Alkaline foods: leafy greens, broccoli, cauliflower, kumara, courgette, tomato, citrus fruit, berries, kiwifruit, banana, avocado, and most herbs. Despite their acidic taste, citrus and tomato are strongly net alkaline once metabolised.
The practical rule: every meal containing animal protein, grain, or hard cheese should include two to three handfuls of vegetables or fruit. That single habit moves PRAL more than any other intervention.
How Inception Nutrition reads this in your report
We calculate your weekly PRAL average from your food log using the Remer and Manz equations. The score is reported alongside your protein intake, calcium intake, and body composition scan trend for muscle and bone proxy markers.
If you are eating well above 1.6 g/kg of protein for body composition or longevity goals, we look closely at your alkaline food volume. Without that balance, the protein strategy can backfire over months.
With 22+ years of practice and Dr Matt Walley's PhD methodology behind the report, we know which alkaline additions clients actually sustain. The recommendation is always a specific food, a specific portion, at a specific meal.
What twenty-two years of practice and 1,380+ clients show
- In our longitudinal data, dietary acid load drops cleanly with daily leafy greens plus citrus, without protein restriction.
- Older adults running the longevity programme show better strength preservation when alkaline-leaning vegetables anchor each plate.
- Hydration and sodium balance shift acid load reads as fast as food choices in clients on heavy training cycles.
Frequently asked
- Does drinking alkaline water help my acid load?
- The effect is small compared to food choices. The fastest improvement comes from adding vegetables and fruit at every meal containing protein or grain.
- Should I eat less protein to lower my acid load?
- Not usually. The better approach is to keep your protein intake at the level that supports your training and recovery, then add enough alkaline foods to balance the load.
- Are NZ-grown fruits and vegetables enough to balance a high-protein diet?
- Yes, when eaten in adequate volume. Two to three palm-sized servings of vegetables per main meal, plus daily fruit, will balance most clients' protein intake.
Predictions become precision when they meet your scan.
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