Is Diet Soda Bad for You? 4 Reasons to Ease Up on Low-Calorie Colas

Most of us who drink diet soda do so to save on calories. However, just because diet soda doesn’t have any calories doesn’t mean that it has positive nutritional value. Is diet soda bad for you? It can be. Here are four reasons why consuming large quantities on a regular basis can be harmful.

1. Weight Gain

How can a drink with zero calories cause you to gain weight? The problem isn’t so much with the diet soda itself, but rather with our perception of it, according to a study by the University of Illinois at Urbana-Champaign. This study looked at dietary habits and found that those who drank diet sodas were more likely to choose unhealthy foods.

Drinking diet soda and knowing that it doesn’t have any calories makes us feel like we have extra calories to spend, and that it’s ok to eat more calorie-dense foods. The problem is when the food we choose exceeds the number of calories saved by choosing a low-calorie diet beverage.

On the other hand, researchers at the University of Colorado Anschutz Center for Health and Wellness and Temple University’s Center for Obesity Research and Education conducted a 12-week randomized clinical trial to evaluate whether or not diet soda in itself affects weight loss. All of the subjects had the same exercise plan and diet, with the exception being that half were allowed to drink diet beverages while half were allowed to drink only water.

The results? Diet soda drinkers lost 13 pounds on average, while water drinkers lost 9 pounds on average. So if you stick to healthy foods and an exercise plan, diet soda can be part of your weight-loss regime.

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2. Dementia

A 2017 study by Boston University looked at data from the Framingham Heart Study and found that people who drank diet soda daily were three times more likely to develop dementia than those who didn’t. (They also found that those who drank sugary drinks had poorer memory and smaller brain volume, so regular soda isn’t the answer.)

While this study does show a link between diet soda and dementia, more research is necessary to determine whether diet soda actually causes dementia and, if so, how.

3. Heart Disease

A 2012 study by the University of Miami Miller School of Medicine and Columbia University Medical Center found that those who consume diet sodas on a daily basis were 43 percent more likely to be at risk for a heart attack, a stroke, or vascular death. The researchers took into account pre-existing vascular conditions, among them high blood pressure, diabetes, and metabolic syndrome. Those who had lesser quantities of diet soft drnks—between one a month and six a week—were not more likely to suffer a vacular event.

This increased risk was not present for people who drank regular soda or who drank diet soda only occasionally. The study did take into account if subjects had pre-existing conditions such as diabetes or high blood pressure that would predispose them to other vascular events. This study makes it very clear that while a little diet soda is ok, a lot of diet soda is bad for you.
The study mentioned above using Framingham Heart Study data also found that diet soda drinkers were three times more likely to have a stroke.

4. Depression

Researchers at the National Institute of Health found a 31 pecent increase in diagnoses of depression in people who drank four or more cans of diet soda per day. The study tracked the drinking habits of over 200,000 participants for a year, and then 10 years later the participants were asked if they had been diagnosed with depression since the initial study.

While this study does show a link between diet soda and depression, more research is needed to determine if diet soda consumption actually causes depression. It could very well be that people with depression are more likely to choose diet soda, for either biochemical or psychological reasons.

So, Is Diet Soda Bad for You?

The American Heart Association sums it up perfectly in this FAQ about sugar: “You can drink diet sodas in moderation, but they don’t give you any nutrition and shouldn’t be used to excuse overindulging with other foods. Balance them with plain water and a variety of foods and beverages that are high in nutrients and low in added sugars.”

Consuming lots of diet soda on a regular basis may put you at increased risk of a variety of health problems including heart disease, dementia, depression, and weight gain, but a little bit now and then is ok. If you’re looking for a truly healthy beverage, water is of course the best choice. Sparkling water and seltzer will quench your carbonation cravings. Tea, coffee, and red wine also have health benefits. Click here for some tips on how to quit (or at least cut back on) drinking diet soda.

—By Kate Eldredge

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