Research

Hormonal

In men with metabolic syndrome, a 12-week lifestyle intervention increases circulating BDNF, and this increase correlates with reduced depressive symptoms, whereas body weight reduction alone does not predict depression improvement.

For men with metabolic syndrome, lifestyle changes improve depression, but only if they successfully raise BDNF levels. Simply losing weight without raising BDNF will not improve your mood. Focus on the lifestyle changes (diet and exercise) that boost BDNF, rather than just the scale.

ModerateQualifiesMEDIUM confidence
Zung SDS only significantly improved in men with increased fasting BDNF levels after a lifestyle intervention... The increased percentage of BDNF was inversely correlated with the change in Zung SDS... change in body weight or MetS components were not correlated with Zung SDS.
I‐Te Lee et al. · Diabetology & Metabolic Syndrome · 2014

Why this rating

Prospective study with a small sample size (n=36) and a single gender.

Source

Brain-derived neurotrophic factor, but not body weight, correlated with a reduction in depression scale scores in men with metabolic syndrome: a prospective weight-reduction study

I‐Te Lee et al. · Diabetology & Metabolic Syndrome · 2014

DOI 10.1186/1758-5996-6-18

cohort · n=36Cited 27×
Read the paper
DOI resolved against Crossref · corpus check 2026-06-10

This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →