Waterloo sparkling water is not bad for you. It contains zero calories, zero sugar, and no artificial sweeteners. The ingredients list is short: purified carbonated water and natural flavors. For most people, drinking it regularly poses no meaningful health risks, though the carbonation and acidity deserve a closer look if you have sensitive teeth or digestive issues.
What’s Actually in Waterloo
Waterloo keeps things simple. Every can contains purified carbonated water and natural flavors. There’s no sodium, no sugar, no high fructose corn syrup, and no artificial ingredients. The flavors are Non-GMO Project Verified extracts, oils, or essences derived from vegan sources, paired with complementary flavor extracts to build each variety’s taste. No MSG, no synthetic solvents. If you’re switching from soda or juice, the nutritional upgrade is dramatic.
Carbonation and Your Teeth
This is the one area where sparkling water, including Waterloo, warrants some attention. When carbon dioxide dissolves in water, it forms a weak acid called carbonic acid, which lowers the pH. Tooth enamel begins to demineralize when the pH drops below roughly 5.2 to 5.5. Plain sparkling water typically sits above that threshold, but flavored varieties can dip closer to it depending on the specific flavor compounds used. Citrus flavors tend to be slightly more acidic than, say, watermelon or plain sparkling water.
The American Dental Association acknowledges that flavored sparkling waters are far less erosive than sodas or fruit juices, but still recommends a few practical habits: use a straw to minimize contact with your teeth, sip and swallow rather than swishing the water around your mouth, and wait an hour after drinking before brushing so saliva has time to naturally wash away acids and re-harden enamel. Rinsing with plain water or snacking on cheese afterward can also help neutralize any residual acidity. These precautions matter most for people who drink several cans throughout the day.
Digestive Effects
A common concern is that carbonated water worsens acid reflux or causes bloating. The evidence is reassuring. A systematic review in the journal Alimentary Pharmacology & Therapeutics found that while carbonated beverages cause a very brief dip in the pH inside the esophagus and a temporary relaxation of the valve between the esophagus and stomach, there is no direct evidence that they promote or worsen gastroesophageal reflux disease (GERD). The researchers found no connection to esophageal damage or GERD-related symptoms.
That said, some people do notice bloating or a feeling of fullness after drinking sparkling water. This is simply the gas expanding in your stomach. It’s harmless but can be uncomfortable, especially if you drink large amounts quickly or already deal with irritable bowel symptoms. If carbonation bothers you, that’s a personal tolerance issue rather than a health risk.
Does It Weaken Your Bones?
No. This myth likely stems from older research linking cola consumption to lower bone density, but cola contains phosphoric acid, which plain and flavored sparkling waters do not. A study published in the American Journal of Public Health examined carbonated beverage intake among older women and found that bone mineral density was not associated with intake of any type of carbonated beverage after adjusting for age, calcium intake, exercise, and other factors. Modest intake of carbonated beverages does not appear to harm bone density.
Could It Make You Hungrier?
One 2017 study raised an interesting question. Researchers found that male rats consuming carbonated beverages over about a year gained weight faster than rats drinking flat versions of the same beverages or tap water. The mechanism: carbonation appeared to trigger higher levels of ghrelin, the hormone that signals hunger, leading the rats to eat more. A parallel study in 20 healthy human males also showed elevated ghrelin levels after drinking carbonated beverages compared to flat alternatives.
This finding is worth knowing about, but context matters. The study was small on the human side, included only men, and measured short-term hormone spikes rather than long-term weight outcomes in people. No large human trials have confirmed that sparkling water consumption leads to weight gain. If you notice that sparkling water seems to make you snackier, it’s a reasonable hypothesis, but the evidence is preliminary and not a reason to avoid it.
Hydration Compared to Still Water
Sparkling water hydrates just as well as still water. A randomized trial that developed a “beverage hydration index” found that cumulative urine output four hours after drinking sparkling water was no different from the response to plain water. Cola, tea, coffee, and orange juice performed similarly on this measure too. The carbonation does not pull water out of your system or reduce absorption. If sparkling water helps you drink more fluids throughout the day, it’s doing its job.
Who Should Be Cautious
Waterloo is a safe daily drink for the vast majority of people. The groups who might want to moderate intake or take extra precautions are those with existing enamel erosion or very sensitive teeth (stick with a straw and rinse afterward), people who find carbonation triggers uncomfortable bloating, and anyone who notices increased snacking after drinking it. None of these situations call for avoiding sparkling water entirely. They just call for paying attention to how your body responds.