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Related Concept Videos

Depression: Overview01:18

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
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Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
Long-term Depression01:05

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
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Vitamins01:30

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Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...

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Related Experiment Video

Updated: Jun 25, 2026

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
04:33

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder

Published on: April 26, 2024

Association Between Low Vitamin D Levels and Depression: A Systematic Review and Meta-Analysis.

Saira Karim1, Julia Natche2, Shimul A Babli3

  • 1Medicine, King Edward Medical College, Lahore, PAK.

Cureus
|June 24, 2026
PubMed
Summary

Low vitamin D levels significantly increase depression risk by 45%. This meta-analysis of longitudinal studies highlights the association between vitamin D deficiency and increased odds of developing depression.

Keywords:
25-hydroxyvitamin dcohort studydepressionmeta-analysisserotoninsystematic reviewvitamin d deficiency

Related Experiment Videos

Last Updated: Jun 25, 2026

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
04:33

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder

Published on: April 26, 2024

Area of Science:

  • Neuroscience
  • Endocrinology
  • Psychiatry

Background:

  • Depression affects millions globally, with standard treatments failing one-third of patients.
  • Vitamin D deficiency is linked to depression risk through biological pathways involving serotonin synthesis.
  • Previous meta-analyses lacked causal inference due to mixed study designs.

Purpose of the Study:

  • To investigate the association between serum 25-hydroxyvitamin D [25(OH)D] levels and incident depression.
  • To exclusively include longitudinal studies and adjusted RCTs to minimize reverse-causation bias.
  • To provide a robust meta-analysis of high-quality evidence on vitamin D and depression.

Main Methods:

  • Systematic literature search of four databases (inception to December 2024).
  • Inclusion of prospective cohort, retrospective cohort, registry-based studies, and multivariable-adjusted RCTs.
  • Random-effects meta-analysis of 15 studies (N=49,931) using DerSimonian-Laird method; risk of bias assessed with NOS and RoB 2 tools.

Main Results:

  • Low serum 25(OH)D was associated with a 45% increased odds of depression (OR=1.45, 95% CI: 1.36-1.56).
  • No significant heterogeneity was observed (I²=0%), indicating consistent findings across studies.
  • The association remained consistent across various study designs, regions, and deficiency thresholds.

Conclusions:

  • Low serum 25(OH)D is robustly associated with a higher risk of developing depression.
  • The homogeneous findings suggest a reliable link, but further RCTs are needed.
  • Future research should focus on adequately powered randomized trials to determine if vitamin D repletion can prevent depression.