A new study in the Clinical Journal of the American Society of Nephrology shows that people who drink soda and other sugary drinks, including fruit punch, every day have a higher risk of developing kidney stones than people who drink these beverages more infrequently.
The findings are especially important considering "drink more fluids!" is a common piece of advice people are told to reduce the risk of future kidney stones -- and the results suggest that all fluids may not be created equal when it comes to lowering risk.
"Although higher total fluid intake reduces the risk of stone formation, this information about individual beverages may be useful for general practitioners seeking to implement strategies to reduce stone formation in their patients," study researcher Dr. Pietro Manuel Ferraro, M.D., who is a doctor at the Catholic University of the Sacred Heart of Rome, said in a statement.
Kidney stones are quite common, accounting for more than a million health care visits every year, according to the National Institute of Diabetes and Digestive and Kidney Diseases. They occur when materials in the urine become highly concentrated, forming a solid stone. Sometimes they pass on their own, and sometimes they pass causing much pain and even bleeding.
The study included 194,095 people who were enrolled in the Nurses Health Study I and II, as well as the Health Professionals Follow-Up study. All the study participants provided information about their lifestyle habits and diets for more than eight years, as a median follow-up time.
Researchers found that people who reported drinking at least one sugar-sweetened soda each day had a 23 percent increased kidney stone risk over people who only drank less than one of these beverages a week. And people who drank the most punch in the study had an 18 percent higher kidney stone risk compared with those who drank the least punch.
Plus, certain beverages actually seemed to lower kidney stone risk -- particularly orange juice (12 percent lower), coffee (26 percent lower for caffeinated, and 16 percent lower for decaffeinated), tea (11 percent lower), wine (31 to 33 percent lower) and beer (41 percent lower).
A study presented earlier this year at the American Urological Association meeting showed that exercise -- even just a twice-weekly walk -- can also help to lower women's kidney stone risk.
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This week, researchers from the Harvard School of Public Health found that drinking just one sugar-sweetened beverage a day was associated with a 20 percent bump in a man's risk of having a heart attack over a 22-year period. What's more, that risk increased along with the amount of sugary drinks consumed -- even after researchers controlled for other factors like family history, tobacco use and BMI. <a href="http://vitals.msnbc.msn.com/_news/2012/03/12/10656108-soda-drinking-men-at-higher-risk-for-heart-attack?ocid=twitter" target="_hplink">Reported</a> NBC: <blockquote>And while link doesn't absolutely prove that sugary drinks increase the risk of heart disease, there is evidence from other studies showing that these beverages have an impact on risk factors, [lead author Lawrence] de Koning said. In one study, for example, volunteers who decreased sugary soda consumption experienced a reduction in blood pressure levels, he added.</blockquote> The researchers used data from the longitudinal Health Professionals Follow-up study -- a long-term research project that tracked the health behaviors of 42,883 men over 22 years. Of the entire cohort, a total 3,683 had either fatal or non-fatal heart attacks. Previous analysis of long-term research, such as data from the Nurses' Health Study, <a href="http://www.ncbi.nlm.nih.gov/pubmed/19211821" target="_hplink">show that sugary soda consumption</a> has been individually linked to overall heart disease rates for women as well. But before you consider switching to diet soda, research has shown that it, too, has a negative effect on heart attack and stroke: a <a href="http://www.msnbc.msn.com/id/46431225/ns/health-diet_and_nutrition/t/daily-diet-soda-tied-heart-attack-stroke/#.T1_HQHLOzDW" target="_hplink">separate study</a> of 2,600 adults found that those who drank diet soda regularly were 40 percent more likely to have a heart attack or stroke.
Metabolic Syndrome And Fatty Liver Disease
Even if it doesn't cause weight gain, sugary soda may be damaging your cardiovascular health -- especially if you're a woman. That's because women who drink sugar sweetened beverages are more likely to develop high levels of triglycerides -- a fat found in the blood stream that can indicate <a href="http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0004546/" target="_hplink">metabolic syndrome</a> at high levels. In a review of data from a large, long-term study of the heart health of both men and women, the Multi-Ethnic Study of Atherosclerosis, <a href="http://www.sciencedaily.com/releases/2011/11/111113141252.htm" target="_hplink">researchers found</a> that women who drank at least two sugary drinks per week were four times as likely to have dangerously high trigylceride levels as those who drank only one sugary drink. How does it work? The excess sugar from soda and other drinks is converted in the body to fat. But unlike the subcutaneous fat that's visible under the skin, much of this sugar transforms into either triglycerides or fatty tissue that surrounds organs, like the liver. And both metabolic syndrome and fatty liver disease can contribute to higher risk of coronary heart disease, Type 2 diabetes and stroke.
Naturally, consuming extra calories from added sugar will lead to weight gain. But even diet soda may lead to unhealthy pounds. While the research is not yet conclusive, recent data demonstrated an association between regularly drinking diet soda and larger waist lines. <a href="http://www.huffingtonpost.com/2011/06/29/diet-soda-weight-gain_n_886409.html" target="_hplink">Wrote</a> HuffPost Healthy Living's own Amanda L. Chan: <blockquote>A study presented at an American Diabetes Association meeting this week shows that drinking diet soda is associated with a wider waist in humans. And a second study shows that aspartame -- an artificial sweetener in diet soda -- actually raises blood sugar in mice prone to diabetes. "Data from this and other prospective studies suggest that the promotion of diet sodas and artificial sweeteners as healthy alternatives may be ill-advised," study researcher Helen P. Hazuda, Ph.D., a professor and chief of clinical epidemiology at the University of Texas Health Science Center San Antonio's School of Medicine, said in a statement. "They may be free of calories but not of consequences."</blockquote> An observational study and an experiment in rodents does not make for a lock-tight association, but it's enough to raise cause for concern.
An ingredient in cola could be leaching calcium from your bones. <a href="http://www.tuftshealthletter.com/ShowArticle.aspx?rowId=23" target="_hplink">One study</a> from Tufts University researchers found that women who reported drinking just three colas a week had an average 4 percent more bone loss at important sites in the hips than women who drank any other beverage -- including non-cola, sugary drinks and sodas. But why? Both diet and full-sugar cola contain the flavoring phosphoric acid. According to the study's lead author, Kathleen Tucker, that causes greater acidity in the blood. "At that point, your body's first priority is to restore a balance, so it leaches some calcium out of your bones to neutralize the acid," she told <a href="http://www.thedailybeast.com/newsweek/blogs/the-human-condition/2009/05/22/by-the-numbers-the-truth-behind-those-scary-diet-soda-myths.html" target="_hplink"><em>The Daily Beast</em></a>.
Type 2 Diabetes
Diabetes goes hand-in-hand with obesity and heightened sugar consumption, so it's no surprise that drinking full-sugar soda is associated with the disease. The Nurse Health Study data on 90,000 adult women <a href="http://www.ncbi.nlm.nih.gov/pubmed/15328324" target="_hplink">revealed</a> that those who drank one or more sugary soft drinks (such as soda or juice) were also twice as likely to develop Type 2 diabetes. And a <a href="http://www.ajcn.org/content/94/2/479.abstract" target="_hplink">separate study</a> reveals why: sugary drinks increase the level of fasting glucose and insulin resistance -- two signs of pre-diabetes. <a href="http://www.sciencedaily.com/releases/2011/06/110627183944.htm" target="_hplink">Initial studies in mice</a> even find that heightened consumption of the aspartame in diet soda can have an ill effect on fasting glucose levels, though that research is not yet conclusive.
Half of Americans Drink Soda Every Day
About half of Americans who participated in a study done as part of Gallup’s annual Consumption Habits poll claimed that they drink at least one glass of soda per day. Even though soda drinks have no nutritional value and are choc full of sugar and sodium, the same number of non-soda drinkers, about 4 out of 10, said that they are overweight compared to the same number of people who drink soda daily.