An Apple a Day Keeps Kidney Stones Away
Reported August 17, 2009
(Ivanhoe Newswire) — Yet another reason to eat well — a healthy diet helps prevent kidney stones. Loading up on fruits, vegetables, nuts, low-fat dairy products, and whole grains, while limiting salt, red and processed meats, and sweetened beverages is an effective way to ward off kidney stones, according to a new study. Because kidney stones are linked to higher rates of hypertension, diabetes, increased body weight, and other risk factors for heart disease, the findings have considerable health implications.
Eric Taylor, MD of Maine Medical Center and his colleagues at Brigham and Women’s Hospital conducted a study to determine the effects of healthy eating on the formation of kidney stones. The investigators collected information from individuals enrolled in three clinical studies. In the Health Professionals Follow-up Study, 45,821 men were followed for 18 years; the Nurses’ Health Study I followed 94,108 older women for 18 years; and the Nurses’ Health Study II followed 101,837 younger women for 14 years.
Dr. Taylor’s team assigned a score to each participant based on eight components of a DASH (Dietary Approaches to Stop Hypertension) style diet: high intake of fruits, vegetables, nuts and legumes, low-fat dairy products, and whole grains, and low intake of salt, sweetened beverages, and red and processed meats.
A total of 5,645 kidney stones developed in the participants in the three studies. In each study, participants with the highest DASH scores were between 40 and 45 percent less likely to develop kidney stones than participants with the lowest DASH scores. The reductions in kidney stone risk were independent of age, body size, fluid intake, and other factors.
Because a DASH-style diet may affect the development of hypertension, diabetes, and other chronic diseases associated with kidney stones, the researchers also performed an analysis limited to study participants without hypertension or diabetes. Even among those individuals, the DASH diet reduced the risk of kidney stones.
This study indicates that adopting a DASH-style diet may be an effective alternative to medications used to treat kidney stones, many of which have unpleasant side effects.
SOURCE: Journal of the American Society Nephrology (JASN), August 13, 2009