Can keto cause kidney stones? What's the actual risk?

The kidney stone concern is real but manageable and context-dependent. Here's the honest picture:

The association between keto and kidney stones is mostly from studies on children using therapeutic keto for epilepsy — typically stricter protocols than adult nutritional keto, with different dietary composition.

For adult nutritional keto, the main risk factors are:

1. Uric acid stones: Keto is high protein, and protein metabolism produces uric acid. Adequate hydration flushes this. Risk is elevated in people already prone to gout or uric acid stones.

2. Calcium oxalate stones: The most common type. Risk can increase if magnesium is low (magnesium binds oxalate in the gut preventing absorption). Keto supplemented with adequate magnesium reduces this risk.

Risk reduction: Drink 2.5-3 liters of water daily (most important), take magnesium daily, add lemon juice to water (citrate inhibits stone formation), don't over-do protein.

I have a family history of kidney stones (father had them twice). Started keto 14 months ago. No stones. My protocol: lemon water every morning, 3L water daily, magnesium glycinate, moderate protein (not excessive). It can be done safely with attention to these factors.

The water intake point is really the #1 factor. Many kidney stone cases on any high-protein diet come down to chronic mild dehydration concentrating minerals in the urine. Keto makes you urinate more (diuretic effect), so you need more water than you did before keto — at minimum 2.5L but 3L is safer.