correlational
Taking 3 grams of glycine before bed might help people who have trouble sleeping feel less sleepy during the day and remember things better.
Scientific Claim
In individuals with chronic poor sleep quality, ingestion of 3 grams of glycine before bedtime was associated with reduced daytime sleepiness and improved memory recognition task performance.
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 used causal language ('lessened', 'improved') despite being an uncontrolled observational study without randomization or control group, which cannot establish causation. Only association can be claimed.
Evidence from Studies
No evidence studies found yet.