Can Diet Soda Technically Break Your Fast?
Technically, no, diet soda does not break your fast - if you’re fasting for calorie restriction or metabolic effects - because it has zero or few calories.
However, you need to consume diet soda in moderation and with caution because some artificial sweeteners may affect insulin response or hunger levels [3] [4] [5].
Does it mean diet soda can hinder weight loss?
Learn More: Do Medications Break a Fast?
Can Diet Soda Impact Your Weight Loss Efforts?
Many studies suggest that although diet soda is marketed as a healthy alternative to regular soda, it’s not that healthy or waist-line-friendly!
Yes, diet soda has no or few calories but it has no nutritional value, either. The table below shows the nutritional facts of 100 grams of diet soda [6].
| Nutrients | Amounts |
|---|
| Calories |
0 kcal |
| Protein |
0.1 g |
| Total Fat |
0 g |
| Carbohydrates |
0 g |
| Fiber |
0 g |
| Sugars |
0 g |
| Calcium |
4 mg |
| Iron |
0.04 mg |
| Magnesium |
1 mg |
| Phosphorus |
0 mg |
| Potassium |
2 mg |
| Sodium |
6 mg |
| Zinc |
0 mg |
| Copper |
0.025 mg |
| Selenium |
0 µg |
| Vitamin C |
0 mg |
Please note that not all diet sodas are free of calories and sugar, and even not all artificial sweeteners are low in calories or sugar. Some contain both sugar and sweeteners, like Coca-Cola Life, stevia sweetener, 90 calories, and 24 grams of sugar in each can.
The problem is not that diet soda has no specific nutrients, but artificially sweetened drinks may cause different health problems, especially metabolic syndrome, which can lead to various issues like the risk of heart disease and diabetes, insulin resistance, belly fat, and high blood pressure.
A 2015 study on the links between consuming diet soda and waist circumference found that increased consumption of diet soda could increase abdominal obesity, which can raise cardiometabolic risk [7].
Another 2015 study indicated that diet soft drinks can increase the risk of metabolic syndrome, which can lead to weight gain [8].
A 2017 study on the effects of sugar and artificially sweetened drinks on weight gain found that there was a significant relationship between consuming sugar and artificially sweetened soda and obesity [9].
Artificial sweeteners in diet soda can even disrupt the body's natural ability to regulate calorie intake and hunger, leading to overeating and weight gain.
But that’s not all.
Learn More: Carnivore Diet Fasting
Other Side Effects of Diet Soda
Consuming diet soda can also lead to health problems, including:
- Type 2 Diabetes
- Cardiovascular Problems
- Kidney Problems
- Mental Issues
- Dental Issues
- Digestive Problems
- Headaches
- Osteoporosis
Diet soda remains a popular beverage choice, with approximately 20% of the total carbonated beverage market in the United States consisting of diet sodas. (Source: Statista, 2023)
Type 2 Diabetes
A 2018 study on diet soda and sugar content revealed that using artificial sweeteners in diet drinks does not lower the risk of diabetes, and diet soda can be an independent diabetes risk factor [10].
A 2015 study indicated that drinking sugar-sweetened beverages significantly increased the incidence of type 2 diabetes, independently of adiposity. Also, artificially sweetened beverages were not found to be healthy alternatives to sugar-sweetened drinks to prevent type 2 diabetes [11].
A 2009 study on the association between consuming diet soda and diabetes and metabolic syndrome found that daily intake of diet soda was associated with significantly greater risks of metabolic syndrome and type 2 diabetes [12].
A 2010 study on the safety of diet soft drinks indicated that individuals drinking diet soda every day have a higher risk of developing type 2 diabetes and metabolic syndrome, which includes high blood pressure, high cholesterol and triglyceride levels, insulin resistance, and excess abdominal fat [13].
Cardiovascular Problems
A 2016 study found that despite what many may think both sugar-sweetened and artificially sweetened beverages can increase the risk of hypertension [14].
A 2015 study on the connection between hypertension and artificially sweetened drinks suggested that there were statistically significant associations between consuming both sugar and artificially sweetened soda and hypertension [15].
A 2012 study found a direct link between drinking both artificially and sugar-sweetened beverages and the incidence of hypertension [16].
Kidney Problems
A 2017 study demonstrated that consuming diet soda was associated with a higher risk of end-stage renal disease (ESRD) in its population sample [17].
Among consumers who drink soda, approximately 29% opt for diet soda rather than regular soda. This indicates a significant segment of the population prefers the lower-calorie and sugar-free option. (Source: Beverage Marketing Corporation, 2022)
Mental Issues
A 2014 study on the relationship between the risk of depression and drinking coffee, tea, and sweetened drinks found that drinking coffee or tea with no sweetener was linked to lower depression.
Consuming artificially sweetened drinks showed higher risks of depression, i.e., regular intake of sweetened beverages, especially diet drinks, can raise the risk of depression among older adults [18].
A 2017 study on the connection between drinking diet drinks, coffee, and non-nutritive sweeteners and depression indicated that frequent consumption of coffee and non-nutritive sweetener use was directly linked to depression among populations in Atlantic Canada [19].
Dental Issues
Various studies, including a 2005 study indicated that too much consumption of carbonated drinks in the long term can cause erosion lesions. The acidity of diet soda can erode tooth enamel over time, leading to dental problems, such as cavities and tooth sensitivity [20] [21].
Digestive Problems
A 2010 study suggested that artificial sweeteners in diet soda may alter the composition of gut bacteria, which can negatively affect digestive health [22].
Headaches
Individual reports show that some people experience headaches or migraines as a result of consuming artificial sweeteners found in diet soda.
Globally, diet sodas continue to gain popularity, especially in markets where health-conscious consumers seek alternatives to sugary beverages. Sales have shown consistent growth in various regions, including Europe and Asia-Pacific. (Source: Euromonitor International, 2023)
Osteoporosis
A 2020 study revealed that both diet and regular cola can cause bone mineral density loss in women. The caffeine and phosphorus content in cola can disrupt normal calcium absorption, leading to mineral density loss and osteoporosis [23].
So, to avoid the negative effects of diet soda, we need alternatives to drink while fasting.
Learn More: What Is Fat Fasting?
Diet Soda Alternatives while Fasting
- Water: The ultimate fasting-friendly beverage, keeping you hydrated without breaking your fast
- Black Coffee: Zero-calorie and can help suppress appetite and boost metabolism
- Herbal Tea: Calorie-free and comes in various flavors to satisfy different tastes
- Green Tea: Low in calories and packed with antioxidants, providing a gentle energy boost
- Sparkling Water: Refreshing with no calories or sugar
- Bone Broth: Low in calories and can provide electrolytes and nutrients, especially in homemade varieties
- Apple Cider Vinegar Drink: A tangy zero-calorie drink
- Electrolyte Drinks: Zero-calorie electrolyte drinks that help maintain hydration and electrolyte balance during fasting periods
- Plain Unsweetened Almond Milk: Low in calories
- Lemon Water: A flavorful, calorie-free drink that can help digestion
Learn More: Can You Chew Gum While Fasting?
Can I Drink Diet Soda while Fasting for a Blood Test?
It’s best to avoid diet soda in addition to juice, coffee, soda, and other beverages before a blood test, as they can affect the results. The only 100% safe drink while fasting for a blood test is water.
Learn More: Coffee on a Carnivore Diet: Is It OK? The Best Coffee and Alternatives
Conclusion
So, the answer to the question, “Can you drink diet soda while fasting?”, is yes but you need to remember that diet soda may cause some negative health effects while not breaking intermittent fasting.
If you’re fasting to lose weight and gain health benefits, it’s better to adopt a healthy lifestyle and focus on natural drinks instead of industrial beverages that can negatively impact your health and fitness goals.
