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Regular and diet sodas may taste great, but they’re made with ingredients that don’t always support your nutrition or weight loss goals, especially after bariatric surgery. Here’s a closer look at what’s inside your favorite soft drinks and why moderation matters.
Sodas are designed to be tasty, no doubt about it. The sweetness, acidity, carbonation, and flavorings come together in a drink that feels refreshing and is difficult for many people to resist.
Unfortunately, those same ingredients don’t necessarily complement a bariatric lifestyle. Enjoying an occasional soda isn’t likely to derail your weight loss efforts, but if they’re a daily habit, it can be more difficult to stay hydrated, meet your nutritional goals, and stay consistent with healthy habits.
What’s in Your Soda?
Added Sugars (Regular Soda)
Added sugars are what give regular soda its signature sweetness, and they make soft drinks enjoyable to drink. But they also contribute calories without providing meaningful nutrition like protein, fiber, vitamins, or minerals. Not to mention that because those calories are consumed in liquid form, they pass through the stomach quickly and generally don’t provide the same feeling of fullness as whole foods. Regularly drinking sugar-sweetened beverages can make it easier to consume excess calories without realizing it.
Artificial Sweeteners (Diet Soda)
Diet sodas replace sugar with artificial sweeteners for a sweet taste without the added calories. For some people, diet sodas are a useful way to reduce sugar intake. For others, regularly consuming intensely sweet foods and beverages can reinforce a preference for sweets and make it difficult to cut back.
More recently, United States health officials are taking a closer look at artificial sweeteners as emerging research suggests they may be associated with gastrointestinal, neurologic, and cardiovascular health concerns.1 While studies have not proven that artificial sweeteners directly cause these conditions, current dietary recommendations encourage limiting their use and consuming all sweeteners in moderation.
Carbonation
How does soda become fizzy? From pushing carbon dioxide (CO₂) gas into the liquid and tightly sealing it so the gas stays mixed. When you open the container, the pressure drops, the gas comes out of the liquid, and it rushes out as the familiar bubbles we all know.
After bariatric surgery, those bubbles can take up a lot of space in a smaller stomach pouch and cause bloating, pressure, or discomfort as the gas expands in the digestive tract, and for that reason, most bariatric programs recommend avoiding carbonated beverages, particularly during the early stages of recovery.
Caffeine
Many soft drinks contain caffeine, and although moderate caffeine intake isn’t generally considered dehydrating, replacing water with caffeinated sodas can make it harder to stay adequately hydrated after bariatric surgery. With a smaller stomach pouch, you’ll feel fuller quicker, and with caffeinated beverages taking up that space, you may not feel like you have room for more hydrating fluids. Some sodas and specialty beverages also contain much higher amounts of caffeine than people realize.
Acids
Phosphoric acid and citric acid are ingredients added to enhance the taste and preserve freshness. Although they aren’t directly related to weight loss, drinking acidic beverages frequently is known to erode tooth enamel.
Another thing worth mentioning is that kidney stone risk is higher after some bariatric procedures because changes in fluid intake and urine chemistry can make stones more likely to form. Although research has not shown that phosphoric acid in cola directly causes kidney stones, laboratory studies suggest it may contribute to the growth of infection-related stones under very specific conditions. Still, it’s an additional good reason for limiting sodas in your diet.2
Colors & Flavorings
Artificial flavors and colors are used to create a consistent product that looks and tastes the same every time. Again, they add no nutritional value.
Artificial food dyes have also been getting an increasing amount of attention in the media as researchers study long-term health effects. Some studies have linked certain dyes to behavioral changes, such as hyperactivity, in susceptible children, although the evidence doesn’t show that they cause conditions like ADHD. Ongoing research and recent regulatory changes have also renewed interest in limiting some synthetic dyes in the food supply.3
For adults post-bariatric surgery, the larger concern (until research says otherwise) is that they help make soft drinks highly appealing despite offering little nutritional benefit.
Better Beverages
No single ingredient is likely to make or break your weight loss. It’s the overall pattern of replacing nutrient-rich beverages with soda that matters the most for weight loss as well as your health.
Sodas don’t have to disappear from your life after bariatric surgery – depriving yourself of what you enjoy isn’t a sustainable strategy, and it’s okay to treat yourself to an occasional soda. Just don’t make it your go-to. Saving it for special occasions and savoring it in moderation will make it easier to stay on track with healthy habits without feeling too restricted.
Water should actually be your go-to for everyday hydration. If you want to mix it up, infuse it with fresh fruit, cucumber, or mint for a little extra flavor — it’s also a great way to beat the heat in the summer. Unsweetened tea, hot or iced, is also refreshing and can add variety without the sugars.
Try not to beat yourself up and keep in mind that small changes are easier than dramatic overhauls. If you feel resistant to giving up soda, try replacing every other soda you reach for with an alternative: water, unsweetened tea, herbal teas (ginger and chamomile are great for digestion and relaxation), decaf coffee (without the sugary additives!), or even bone broth on a chilly day. If you’re cleared by your physician, you could also try a sparkling water now and then, but be careful of the carbonation.
Your success is our success, and at Strive, we know that lasting success isn’t built on perfection. We help patients achieve practical habits you can maintain for life. Our team is committed to providing the education, guidance, and support you need before surgery and throughout your weight loss journey. If you’re struggling to make changes or have questions about your nutrition, don’t hesitate to reach out. We’re here to help.
- Cooper, L., & Petersen, A. (2026, January 23). The Government Wants You to Kick Your Diet Soda Habit. Wall Street Journal. https://www.wsj.com/health/new-dietary-guidelines-sugar-sweeteners-8ac1fe49.
- Skubisz, M., Torzewska, A., Mielniczek-Brzóska, E., & Prywer, J. (2022). Consumption of soft drinks rich in phosphoric acid versus struvite crystallization from artificial urine. Scientific Reports, 12. https://doi.org/10.1038/s41598-022-18357-8.
- Henry Ford Health. (2025). The Health Risks Of Artificial Food Dyes. In Henryford.com. https://www.henryford.com/blog/2025/01/health-risks-of-artificial-food-dyes#.
