What is Stevia (Steviol glycosides)?
Stevia refers to sweet compounds called steviol glycosides extracted from the leaves of Stevia rebaudiana, a plant native to South America. The primary steviol glycosides include stevioside and rebaudioside A, which are responsible for stevia’s intense sweetness—up to 300 times sweeter than sugar. These compounds are widely used as zero-calorie sweeteners in foods, beverages, and dietary supplements.
Steviol glycosides are classified as generally recognized as safe (GRAS) by the FDA and approved as food additives in many countries. Unlike artificial sweeteners, stevia is derived from a natural plant source and has been used traditionally by indigenous peoples of Paraguay and Brazil for centuries to sweeten foods and beverages.
Health benefits & uses
Blood sugar management (Moderate evidence): Several studies suggest steviol glycosides may help improve glucose tolerance and insulin sensitivity. Research indicates that stevia consumption doesn’t raise blood glucose levels and may even have mild glucose-lowering effects in people with type 2 diabetes.
Blood pressure support (Moderate evidence): Some clinical trials have found that regular stevia consumption may modestly reduce blood pressure in people with hypertension. However, results have been inconsistent, and more research is needed to confirm cardiovascular benefits.
Weight management (Limited evidence): As a zero-calorie sweetener, stevia may support weight management by reducing overall caloric intake when substituted for sugar. However, evidence for direct weight loss effects is limited and primarily observational.
Dental health (Limited evidence): Unlike sugar, steviol glycosides don’t promote tooth decay and may have mild antibacterial properties against oral pathogens, though more research is needed to establish definitive dental benefits.
How it works
Steviol glycosides activate sweet taste receptors on the tongue without being metabolized like sugar. After consumption, gut bacteria break down steviol glycosides into steviol, which is then metabolized by the liver and excreted primarily through urine. This process doesn’t significantly impact blood glucose or insulin levels.
The potential health benefits appear to stem from stevia’s ability to replace caloric sweeteners without triggering the same metabolic responses. Some research suggests steviol glycosides may directly influence glucose metabolism and insulin signaling pathways, though these mechanisms require further investigation.
Dosage
The FDA has established an acceptable daily intake (ADI) of 4 mg per kilogram of body weight for steviol glycosides, equivalent to about 12 mg per kg when expressed as steviol equivalents. For a 70 kg adult, this translates to approximately 280 mg of steviol glycosides daily.
Typical usage amounts are much lower than the ADI:
- Sweetening beverages: 1-2 mg per 8 oz serving
- Baking substitution: Follow manufacturer guidelines (varies by product concentration)
- Supplement forms: 200-500 mg daily (consult healthcare provider)
No official RDA or UL has been established. Individual tolerance may vary, and it’s advisable to start with small amounts and consult a healthcare provider for therapeutic uses.
Food sources
Natural steviol glycosides are found exclusively in Stevia rebaudiana leaves. Commercial sources include:
- Purified stevia leaf extracts (liquid or powder)
- Stevia-sweetened beverages and foods
- Whole stevia leaves (fresh or dried)
- Stevia-based tabletop sweeteners
- Processed foods containing stevia as an ingredient
The concentration of steviol glycosides varies significantly between products, with highly purified extracts containing 95% or more steviol glycosides, while whole leaf products contain much lower concentrations.
Safety & side effects
Steviol glycosides are generally well-tolerated by most people. Regulatory agencies worldwide have deemed purified stevia extracts safe for consumption within established limits.
Potential side effects may include:
- Digestive upset (bloating, nausea) in sensitive individuals
- Allergic reactions (rare, primarily in those allergic to ragweed family plants)
- Bitter or metallic aftertaste with some products
- Possible hypoglycemia in people with diabetes when combined with medications
Whole leaf stevia and crude extracts are not approved by the FDA due to potential safety concerns and lack of safety data.
Interactions
Medications: Stevia may potentially interact with diabetes medications by enhancing their glucose-lowering effects, potentially leading to hypoglycemia. People taking insulin or oral hypoglycemic agents should monitor blood sugar closely and consult their healthcare provider.
Supplements: No significant interactions with other supplements have been documented, though stevia’s potential blood pressure-lowering effects might theoretically enhance the effects of other hypotensive supplements.
Other considerations: Some stevia products contain added ingredients like erythritol or dextrose that may have their own interaction profiles.
Who should be cautious
Certain groups should exercise caution or consult healthcare providers before using stevia:
- People with diabetes: Monitor blood glucose when first incorporating stevia, especially if taking glucose-lowering medications
- Pregnant and breastfeeding women: While purified steviol glycosides appear safe, consult healthcare providers before use
- People with ragweed allergies: May be at increased risk for allergic reactions to stevia
- Individuals with hypotension: Monitor blood pressure if using large amounts regularly
- Children: Generally safe within normal dietary amounts, but avoid excessive consumption
Frequently asked questions
Is stevia safe for people with diabetes?
Yes, purified steviol glycosides are generally safe for people with diabetes and don’t raise blood glucose levels. Some research suggests stevia may even help with glucose control, but people taking diabetes medications should monitor blood sugar and consult their healthcare provider.
Can stevia cause digestive problems?
Most people tolerate stevia well, but some may experience mild digestive upset, particularly when first introducing it or consuming large amounts. Starting with small quantities can help assess individual tolerance.
Is there a difference between stevia products?
Yes, products vary significantly in purity and composition. Highly purified steviol glycoside extracts (Reb A) tend to have the best taste profile, while whole leaf products may have a more bitter taste and aren’t FDA-approved for food use.
Does stevia affect blood pressure?
Some studies suggest stevia may modestly lower blood pressure in people with hypertension, but results are inconsistent. People with low blood pressure or those taking blood pressure medications should consult their healthcare provider.
Can children consume stevia safely?
Purified steviol glycosides are generally recognized as safe for children when consumed within normal dietary amounts. However, whole leaf stevia products should be avoided, and parents should consult pediatricians about appropriate amounts for their children.
Classification:
Typical dose: — · Studied up to: —
References
Authoritative profile & live regulatory status: Stevia (Steviol glycosides) on SupplementIndex →