People often ask, “Can I use stevia while fasting?” Here’s what to know about using stevia during a fasting window.
Stevia is commonly used during fasting because pure stevia contains little to no calories, but whether it fits your fast depends on your fasting goals and the product you choose. Pure stevia contains little to no calories or carbohydrates. Some research has explored its relationship with blood glucose and insulin, but individual responses and product formulas can vary. However, if you use stevia during your fasting window, it’s best to choose a pure stevia extract without added sugars. These extra ingredients may add calories or carbohydrates, which can matter depending on how you define your fast.
Wanting something sweet during a fast is common. Pure stevia is one option some people use to add sweetness without adding meaningful calories.
Let’s see why.
Disclaimer: This article is for informational purposes only and shouldn’t be considered medical advice. Fasting may not be appropriate for everyone, particularly those with medical conditions, pregnant or breastfeeding individuals, or people who are taking certain medications. Consult a qualified healthcare professional before you make significant changes to your diet or fasting routine.
Yes, stevia is generally considered suitable for intermittent fasting when used in small amounts and in its pure form (1). Many people use stevia to sweeten coffee or tea during fasting periods as it contains virtually no calories and has little impact on blood sugar levels.
Here’s a quick summary of why most people search for stevia intermittent fasting these days:
Let’s take a closer look at why stevia may fit some fasting routines and when it could be less suitable for certain individuals.
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Stevia is a natural sweetener that is derived from the leaves of Stevia rebaudiana. This plant is native to South America. In its purified form, it contains virtually no calories and is around 200-400 times sweeter than table sugar (7).
The sweetness comes from compounds called steviol glycosides. These are extracted from the leaves and used in approved stevia sweeteners. High-purity stevia extracts typically contain at least 95% steviol glycosides, including stevioside, rebaudiosides, dulcoside A, rubusoside, and steviolbioside (8).
Unlike sugar, steviol glycosides aren’t fully digested by the body. They pass through the small intestine largely unchanged and are broken down by gut bacteria in the colon. As the body doesn’t metabolize them for energy, stevia contributes little to no calories and has a negligible effect on blood sugar levels (9).
When choosing stevia products, look for those made from purified stevia extract rather than raw stevia leaves or blends with added sugars and fillers.
Read more: Green Tea Intermittent Fasting: Benefits and Side Effects
As previously mentioned, stevia may fit some intermittent fasting routines by providing sweetness without adding meaningful calories. It contributes little to no energy, which makes it popular among people who want to sweeten their coffee, tea, or other beverages while keeping their calorie intake low (6).
Some potential benefits of stevia during fasting include:
Research has suggested that steviol glycosides have little to no effect on blood glucose or insulin levels when consumed in moderation (9). This is one reason why some people choose pure stevia instead of caloric sweeteners during a fasting window.
However, not all stevia products are the same. Some commercial sweeteners or blends contain added sugars, dextrose, maltodextrin, or other ingredients that may increase calorie and carbohydrate intake (11). So, if you want to add stevia to your intermittent fasting routine, choose a high-purity stevia extract with minimal additives. This can help keep added calories and carbohydrates low.
An acceptable daily intake has been established for steviol glycosides at 1.8 mg per pound, or 4 mg per kilogram, of body weight (12). Most people use far less than this amount when sweetening beverages during a fasting window.
As a practical guideline, a pinch of stevia powder or 5-7 drops of liquid stevia is often enough for one serving of coffee or tea (1). However, the exact amount can vary by brand and concentration. Therefore, it’s a good idea to check the productand start with a small amount.
Some people use stevia without noticeable discomfort, while others may be sensitive to certain products. It often occurs when consuming large amounts of products that contain added ingredients. Choosing a high-purity stevia extract with fewer additives may be easier for some people to tolerate.
Read more: Green Tea Intermittent Fasting: Benefits and Side Effects
If your goal is to keep calories and carbohydrates very low during your fasting window, focus on sweeteners with little to no calories or carbohydrates. Pure stevia extract is a popular choice as it provides sweetness without significant caloric intake.
We also know that not all stevia products are the same. Some contain additives such as dextrose, maltodextrin, or sugar blends that can increase calorie and carbohydrate content.
The table below compares some of the most commonly used sweeteners during fasting:
| Sweeteners | Calories | Carbs | Breakfast | Notes |
|---|---|---|---|---|
| Pure stevia extract (13) | 0 calories | 0g | Generally no | Choose products with stevia extract or steviol glycosides only. |
| Liquid stevia (no additives) (11) | 0 calories | 0g | Generally no | Commonly added to coffee or tea during fasting. |
| Monk fruit extract (12) | 0 calories | 0g | Generally no | Naturally sweet and calorie-free when used in pure form. |
| Sucralose (13) | 0 calories | 0g | Generally no* | Check labels, as some products contain fillers. |
| Erythritol (14) | Near 0 | Near 0g | Generally no* | Sugar alcohol with minimal calories and carbs. |
| Stevia blends with dextrose or maltodextrin (15) | Varies | Varies | May | Added ingredients can increase calories and carbohydrates. |
*Individual responses may vary, and product formulations differ.
When selecting a sweetener, read the ingredient list carefully. Products with fewer additives may be easier to fit into a fasting routine than those that contain sugars, fillers, or bulking agents.
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Although stevia contains little to no calories, some people report experiencing sugar cravings after consuming sweet-tasting foods or drinks. One proposed explanation is that sweetness activates reward pathways in the brain that are also involved in food-seeking behavior (16).
As stevia tastes sweet without providing the calories or glucose that are typically associated with sugar, it may affect appetite cues for some people. Some people may notice stronger cravings later, while others may not.
Note: Responses can vary from person to person, and not everyone experiences increased cravings after using stevia.
More research is needed to fully understand how non-nutritive sweeteners affect appetite and eating behavior over time.
Pure stevia is unlikely to affect ketosis for many people when used in small amounts, as it contains little to no digestible carbohydrates. This is one reason why people who ask, “Does stevia break fast or ketosis?” often choose it as an alternative to sugar during fasting periods.
Ketosis occurs when carbohydrate intake is kept low enough that the body may increase its use of fat-derived energy sources. As glucose stores decline, the liver produces ketones, which can be used for energy by many tissues (17). Typical ketogenic diets limit daily carbohydrate intake to around 30-50 grams (18).
In comparison, stevia contributes negligible calories and only trace amounts of carbohydrates when used in typical serving sizes. Because pure stevia contains little to no digestible carbohydrates, small amounts are commonly considered unlikely to meaningfully affect carbohydrate intake.
It’s important to understand that product labels matter. Some stevia sweeteners or blends contain added sugars, such as dextrose or maltodextrin. They may increase carbohydrate intake. As a result, the products become less suitable for maintaining ketosis.
Many people drink black coffee with pure stevia during a fasting window, but whether it fits depends on the type of fast and the product used. Black coffee contains very few calories, and pure stevia contributes little to no calories or carbohydrates (19, 13). This combination is commonly used by people who want a low-calorie drink option.
The key is to use pure stevia extract and avoid ingredients that add significant calories. Although stevia itself is unlikely to affect a fasting window, additions such as milk, cream, flavored syrups, and sugar can increase calorie intake and may interfere with fasting goals.
| Ingredient | Fasting-Friendly? |
|---|---|
| Black coffee | Yes |
| Pure stevia extract | Yes |
| Liquid stevia (no additives) | Usually |
| Whole milk | No |
| Coffee creamer | Generally no |
| Sugar or flavored syrups | No |
To keep the calories low, keep your coffee simple. Black coffee with stevia while fasting may help satisfy a sweet craving without adding meaningful calories. Just make sure that the stevia product doesn’t contain added sugars or fillers that contain calories.
As with coffee, you can drink tea while fasting, provided the tea and sweetener contain little to no calories. Many unsweetened teas are naturally very low in calories. For example, a cup of ginger tea contains about 2.4 calories (20).
Like coffee, tea is best consumed without calorie-containing additions during a fast. Adding milk, cream, honey, or sugar can increase calorie intake and may interfere with your fasting goals. In contrast, tea with stevia while fasting is often considered a suitable option. Again, the reason is the same. Pure stevia contributes few to no calories or carbohydrates.
To keep the drink simple, choose plain black, green, herbal, or ginger tea and use a small amount of pure stevia extract if you prefer a sweeter taste.
If you prefer flavored drinks during a fasting window, stevia can add sweetness without contributing a large chunk of calories. As water contains no calories, adding a small amount of pure stevia is unlikely to add meaningful calories or carbohydrates when it’s used in small amounts.
Other ways to use stevia while fasting include:
Staying within the recommended daily intake and choosing products with minimal additives can help you keep added calories and carbohydrates low while enjoying a sweeter taste.
We don’t know for certain. Autophagy is complex, and human research doesn’t clearly show exactly how small amounts of stevia affect this process during fasting. This is why some people choose pure stevia during fasting, although evidence on autophagy timing and fasting rules is still limited.
Autophagy is a natural cellular recycling process that helps the body break down and reuse damaged or unnecessary cellular components. It’s often associated with longer fasting periods and may be influenced by longer periods without food, but the exact timing in humans isn’t fully established (21).
As pure stevia contains little to no calories or digestible carbohydrates, some people consider it unlikely to meaningfully affect fasting-related calorie intake. However, the effect it has on autophagy specifically isn’t certain.
Ingredient lists matter. Some stevia products contain added sugars that may affect fasting goals. Therefore, choosing a high-purity stevia extract with minimal additives is generally recommended.
More human research is needed before any clear claims about stevia and autophagy can be made.
Pure stevia is commonly considered compatible with some intermittent fasting routines when it’s used in small amounts, but fasting rules vary.
We don’t know for certain. Pure stevia contains little to no calories, but the specific effect of stevia on autophagy during fasting hasn’t been clearly established.
Sweeteners that contain little to no calories or carbohydrates, such as pure stevia or monk fruit, are commonly used during fasting.
No, pure stevia is unlikely to break ketosis as it contains minimal calories and carbohydrates.
Some research has suggested that pure stevia may have little effect on insulin levels for many people, but individual responses can vary.
Yes, stevia can be added to coffee during keto as long as it’s a pure extract without added sugars or fillers.
Pure stevia contributes negligible carbohydrates in typical serving sizes, so it’s generally considered to be carb-free in practical use.
Pure stevia isn’t usually tracked like regular carbohydrates as it provides little to no digestible carbs in typical amounts. Check labels for blends.
Pure stevia can be one way to add sweetness during a fasting window while keeping calories low. When it’s used in its pure form, it adds taste without meaningful calories. This is why it often comes up in stevia and intermittent fasting discussions. Stick to pure products rather than sugar blends and keep portions small so the product better matches your fasting preferences and goals.
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