correlational
Taking glycine before bed might help people remember things better during the day, according to memory tests.
Scientific Claim
Glycine ingestion (3 g) before bedtime was associated with improved memory recognition task performance in individuals with chronic unsatisfactory sleep, as measured by cognitive function tests.
Original Statement
“Effects on daytime sleepiness and daytime cognitive function were also evaluated. 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 is an observational cohort with unclear randomization and control group status, so causal language ('improved') is inappropriate. Only association can be claimed.
Evidence from Studies
No evidence studies found yet.