Even though the stevia-drinking rats ate and drank the same amount as others, they weighed less during mid-pregnancy.
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design cannot support claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The abstract implies stevia 'causes' lower weight, but without confirmed randomization or mechanistic data, only association is supportable. The lack of intake difference strengthens the association but doesn't prove causation.
More Accurate Statement
“Female Sprague-Dawley rats exposed to Stevia rebaudiana Bertoni extract are associated with significantly lower body weight during the third week of pregnancy compared to controls, despite no difference in food or beverage intake.”
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
Rats that drank stevia extract while pregnant weighed less at three weeks into pregnancy than rats that drank only water — even though both groups ate and drank the same amount. So yes, stevia was linked to lower weight during pregnancy.