Among university students in Jordan, low calcium intake from dairy is linked to depression even when accounting for poor sleep, anxiety, and body pain, indicating calcium may have a unique role in mood regulation beyond these other factors.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether low dietary calcium intake is consistently associated with depressive symptoms in young adults across populations, independent of sleep and anxiety.
A systematic review and meta-analysis of studies measuring dietary calcium intake and depression (using validated scales like HADS or PHQ-9) in young adults aged 18–25, with subgroup analyses controlling for insomnia, anxiety, vitamin D, and physical activity.
Whether increasing dairy calcium intake to 1000 mg/day reduces depressive symptoms in young adults with low baseline intake, independent of sleep or anxiety changes.
A double-blind RCT of 200 university students with low dairy calcium intake (<800 mg/d) and elevated depression scores (HADS ≥11), randomized to 1000 mg/day calcium supplementation or placebo for 16 weeks, with primary outcome being change in HADS-depression score, while controlling for ISI and HADS-anxiety changes.
Whether low dairy calcium intake prospectively predicts the development of depression in young adults, independent of baseline anxiety and insomnia.
A prospective cohort study following 1500 university students aged 18–22 for 3 years, measuring dairy calcium intake quarterly and depression (HADS) annually, using multivariable regression to isolate calcium’s predictive power after adjusting for baseline ISI and HADS-anxiety.
Whether young adults with clinical depression have a history of lower dairy calcium intake than matched controls without depression.
A case-control study comparing dairy calcium intake over the prior 6 months in 200 university students with clinical depression (HADS ≥11) and 200 matched controls (HADS ≤7), using validated food frequency questionnaires and controlling for insomnia severity and anxiety scores.
Whether low dairy calcium intake and depression co-occur in a population at a single point in time.
A cross-sectional survey of 1000 university students measuring dairy calcium intake and HADS-depression score simultaneously, as performed in the current study.