Beetroot juice may benefit pregnant women with chronic kidney disease – study

Daily beetroot juice may help support kidney health during pregnancy in women with chronic kidney disease, early research suggests.

Pregnancy puts additional strain on the kidneys. Around half of women with moderate to severe chronic kidney disease experience a decline in kidney function while pregnant.

Despite these risks, outcomes for pregnant women with the condition have changed little over the past 30 years.

Many medicines used to manage kidney disease are also unsuitable during pregnancy, meaning women often need to stop taking them for at least nine months.

Researchers at King’s College London examined whether dietary nitrate from beetroot juice could offer a simple and safe way to support kidney function during pregnancy.

Beetroot juice is naturally rich in nitrate, which the body converts into nitric oxide. Nitric oxide widens blood vessels and improves blood flow, which could reduce the strain placed on the kidneys during pregnancy.

The study involved 108 pregnant women with stage 2 to 5 chronic kidney disease across eight UK hospitals.

Before reaching 25 weeks of pregnancy, participants were randomly assigned to receive either standard care or a daily beetroot juice supplement containing dietary nitrate.

The study was mainly designed to assess whether a larger clinical trial would be practical. However, the findings also suggested possible benefits for mothers and babies.

Kate Bramham, consultant nephrologist at King’s College Hospital, professor at King’s College London and senior author of the study, said: “For women living with chronic kidney disease, pregnancy has always meant navigating a difficult trade-off between preserving their own health and keeping their baby safe, often with few tools to do both.

“These results are an encouraging first step towards a low-cost, low-risk intervention that could genuinely make a difference for this group of women, who have been underserved by research for far too long.”

Women receiving beetroot juice experienced around 70 per cent fewer serious adverse events overall than those receiving standard care. Of the serious adverse events that occurred, around half affected newborn babies.

Among women with more advanced kidney disease, researchers also observed trends towards better kidney function after pregnancy, fewer newborn admissions to neonatal care and a reduced need for blood pressure medication during pregnancy.

The researchers found no safety concerns linked to beetroot juice supplementation during pregnancy, including no increase in hyperkalaemia, which means unusually high potassium levels in the blood.

There have been concerns that beetroot juice could increase the risk of hyperkalaemia in pregnant women with chronic kidney disease, with some online advice recommending that they avoid it. However, no increase was recorded among women receiving the supplement.

Dr Priscilla Smith, a nephrologist, King’s College London PhD student and first author of the study, said: “Pregnancy can put additional stress on the kidneys, and for women with chronic kidney disease there are currently limited options to protect kidney function during this time.

“Our findings suggest beetroot juice could offer a simple and accessible approach that is safe and worth exploring further.”

The researchers said larger clinical trials are now needed to determine whether beetroot juice can significantly reduce kidney function decline and improve long-term outcomes for mothers and babies.

If confirmed, the intervention could offer an inexpensive and widely available way to support women with chronic kidney disease during pregnancy, when safe treatment options remain limited.

The research was supported by funding from Kidney Research UK.

Dr Andrew Webb, clinical senior lecturer at King’s College London and a co-author of the study, said: “By increasing nitric oxide production, dietary nitrate from beetroot juice may help improve blood vessel function and support kidney health.

“These early findings provide an important foundation for future research into protecting women with chronic kidney disease during pregnancy and their babies.”