correlational
Taking 3 grams of glycine before bed might help people feel less sleepy during the day
Scientific Claim
Glycine ingestion (3 g) before bedtime is associated with reduced daytime sleepiness in individuals with poor sleep, as measured by the Stanford Sleepiness Scale
Original Statement
“Glycine lessened daytime sleepiness and improved performance of memory recognition tasks.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study uses 'lessened' which implies causation, but the design (cohort study) cannot establish causation. Only association can be claimed.
Evidence from Studies
No evidence studies found yet.