What should you know about keto and kidney stones?

Ketogenic eating often reduces carbohydrate-rich foods and may change fluid intake, especially during the first part of the diet. Concentrated urine can allow minerals to crystallise more readily. The balance of protein, salt, calcium and other foods can also influence the urine environment. Kidney stones have different compositions, so the helpful dietary approach is not identical for everyone.

A stone may cause sharp pain in the flank or abdomen, pain that travels toward the groin, painful urination, blood in the urine or difficulty passing urine. Symptoms can overlap with infection, so do not assume that every pain is a stone.

Before starting keto, tell your GP if you have had Kidney Stones, reduced kidney function, gout or repeated urinary problems. Ask how much fluid is appropriate for you; fluid advice may need adjustment if you have heart or kidney conditions. Avoid extreme fasting and very salty packaged foods, and choose a varied plan that can be maintained.

If symptoms begin, stop pushing through the diet and arrange a GP Consultation. An Abdominal Ultrasound may be considered when a clinician needs to assess the urinary tract or another cause of pain.

Get urgent care for severe or worsening flank or abdominal pain, fever or chills, repeated vomiting, inability to keep fluids down, difficulty passing urine, or painful urination with feeling unwell. A blocked urinary tract with infection can become serious.

Arrange prompt assessment for blood in urine, recurring pain or symptoms that do not settle after drinking normally. Do not use large amounts of fluid as a substitute for care if urine cannot pass.

Ask what type of stone you have had, whether keto fits your kidney history, how to distribute fluids through the day, which foods to limit, and whether you need urine or blood tests. Ask how to recognise Dehydration and when imaging such as an Abdominal Ultrasound is appropriate.