Study: Vitamin C tied to men’s kidney stones



REUTERS

Published — Wednesday 6 February 2013

Last update 8 February 2013 8:33 pm

| نسخة PDF Print News | A A

Men who take vitamin C supplements are at higher-than-average risk of developing kidney stones, according to a Swedish study of more than 22,000 men.
“It has long been suspected that high doses of vitamin C may increase the risk of kidney stones as some of the vitamin C absorbed by the body is excreted in urine as oxalate, one of the key components of kidney stones,” said lead researcher Laura Thomas at the Karolinska Institutet in Stockholm.
Thomas and her team, whose findings appeared in JAMA Internal medicine, used data from a large study of middle-aged and elderly Swedish men who answered a series of questions on their diet and lifestyle, then were tracked for an average of 11 years.
The current analysis included 907 men who said they took regular vitamin C tablets and more than 22,000 who didn’t use any nutritional supplements.
Of the vitamin C users, 3.4 percent developed kidney stones for the first time during the study, compared to 1.8 percent of non-supplement users. Men who took vitamin C supplements at least once a day had the highest risk of kidney stones.
Stones are made up of tiny crystals, which can be formed by calcium combining with oxalate. They usually pass on their own, but can cause severe pain in the process, though larger stones occasionally require surgery.
The findings don’t prove that the vitamin itself triggers stones to form. But researchers said that because there are no clear benefits tied to taking high-dose vitamin C, people who have had stones in the past might want to think before taking extra supplements.
Men are more likely to develop stones than women.
The findings don’t mean people shouldn’t get plenty of vitamin C through fruits and vegetables, since the antioxidant is important for bone and muscle health — and severe deficiency can cause scurvy.
“Vitamin C is an important part of a healthy diet,” Thomas said. “Any effect of vitamin C on kidney stone risk is likely to depend both on the dose and on the combination of nutrients with which it is ingested.
Swedish supplements, like those the study participants would have taken, typically contain about 1,000 milligrams (mg) of vitamin C per tablet. Most vitamin C supplements sold in the US contain either 500 or 1,000 mg.
Brian Matlaga, a urologist who studies kidney stones at Johns Hopkins Medicine in Baltimore, said that more research is needed to determine for certain whether reasonable doses of vitamin C may increase the kidney stone risk.
For now, people who haven’t had kidney stones before shouldn’t worry about related risks tied to the vitamin.

 

What's happening around Saudi Arabia

Custodian of the Two Holy Mosques King Salman prays inside the historic Quba Mosque in Madinah. The king was accompanied by Prince Muqrin, Sheikh Abdul Rahman Al-Sudais, head of the Presidency of the Two Holy Mosques and Prince Sultan bin Salman, ch...
JEDDAH: Shop rentals at certain malls have risen by 200 percent, with this cost likely to be passed on to the consumer, the Jeddah Chamber of Commerce and Industry (JCCI) said here recently. Muhammad Al-Shehri, chairman of the JCCI’s textiles and gar...
JEDDAH: People with special needs can now visit a park that has dedicated services for them.Jeddah Mayor Hani Abu Ras opened Al-Erada Park in Al-Salama district on Prince Sultan Street on Thursday.“The Kingdom provides special care for people with di...
JEDDAH: Is involvement in social media the right thing or wrong, particularly in the month of Ramadan? There is a difference of opinion with some arguing that it eats into the time that should be spent praying while some backing it for its religious...
RIYADH: The Argentine government has thanked the Kingdom for previously hosting its Umrah pilgrims for free.“They were part of a group invited by then Custodian of the Two Holy Mosques King Abdullah,” said Ambassador Jaime Sergio Cerda on Thursday.“T...
RIYADH: The Ministry of Education’s counseling department has approved the Rifq Program for the physical and psychological well-being of students.Nabil Mohammad Al-Budair, director of counseling for boys, said the program aims to reduce violence in p...
RIYADH: Sales of fireworks at public markets and main roads in Riyadh have increased during Ramadan, despite the Ministry of Commerce and Industry announcing a SR5,000 reward for anyone providing information about warehouses storing these dangerous i...
RIYADH: The General Organization for Social Insurance (GOSI) has reported that there were 69,241 work-related accidents in 2014, with expatriates making up 65,509 or 94.6 percent and Saudis 3,732.The accidents were in nine sectors with building and c...
JEDDAH: The Health Ministry’s expenditures over the past five years increased from SR29.29 billion to SR53.73 billion, an increase of about 83 percent.According to a study detailing the ministry’s expenditures between 2008 and 2012 issued by the mini...
RIYADH: Five people from the southern Indian state of Kerala were killed in a road accident at Salwa near Dammam in the Eastern Province early Thursday morning.Manoj Kumar, community welfare attache at the Indian Embassy, told Arab News that the vict...
MAKKAH: The government has deployed eight helicopters over Makkah to track the movement of vehicles and people, and assist in security tasks and medical evacuations.Maj. Gen. Mohammad Al-Harbi, commander of the Interior Ministry’s aviation security d...
JAZAN: A Yemeni woman (A.M.) has once again experienced freedom and a renewed sense of hope in life after reuniting with her family last week on her release from Jazan General Prison, where she spent six years on charges of murder of a citizen in the...
RIYADH: A delegation from the Kingdom recently visited the United Arab Emirates (UAE) to explore that country’s successful experience in tourism, in a bid to further develop the sector. Saudi Arabia has been making all-out efforts to promote tourism,...
RIYADH: The Justice Ministry has appointed 1,145 candidates for jobs in the judiciary and urged them to complete the requirements for their final appointment. The candidates in the sixth and fourth ranks are requested to fulfill employment prerequisi...
JEDDAH: Four thousand Djibouti workers are expected to arrive in the Kingdom over the next few months following the labor pact signed between the two countries last month.Speaking to a local publication recently, Djibouti Ambassador Diaa Eddin Saeed...

Stay Connected

Facebook