How Does Depression Affect Cardiovascular Health and Longevity?

The short answer

Depression is an independent cardiovascular risk factor, increasing the risk of coronary heart disease by 64% and stroke by 81% after controlling for traditional risk factors. People with severe mental illness have a life expectancy 10–20 years shorter than the general population, with cardiovascular disease accounting for the majority of excess deaths.

What the evidence actually shows

A meta-analysis by Nicholson et al. (2006) in the European Heart Journal, pooling 21 prospective studies, found that depression was associated with a 64% increased risk of coronary heart disease. The mechanisms are both biological and behavioural. Biologically, depression is associated with elevated cortisol, increased platelet aggregation, reduced heart rate variability, and elevated inflammatory markers (IL-6, CRP, TNF-alpha). Behaviourally, depression reduces adherence to medications, exercise, and healthy diet. Walker et al. (2015) in World Psychiatry found that people with major depression had a life expectancy 7–11 years shorter than the general population, with cardiovascular disease as the leading cause of excess mortality.

"Depression was associated with a 64% increased risk of coronary heart disease, independent of traditional cardiovascular risk factors."

— Nicholson et al., European Heart Journal 2006

What the major health authorities say

MedlinePlus and the NIH identify depression as a major health condition that affects physical health as well as mental health, noting its associations with cardiovascular disease, diabetes, and other chronic conditions. The NIA specifically notes that depression is linked to dementia and recommends treatment as a strategy for maintaining cognitive health in older adults. The NIH recommends a combination of psychotherapy (particularly CBT) and medication for moderate-to-severe depression.

Practical implications

Treating depression is a cardiovascular intervention as well as a mental health one. Evidence-based treatments include cognitive behavioural therapy (CBT), antidepressant medications (SSRIs, SNRIs), and exercise — which has RCT evidence comparable to antidepressants for mild-to-moderate depression. Regular aerobic exercise (150 minutes per week) reduces depression risk by approximately 30% in prospective studies. Social connection and purpose are also protective. If you have symptoms of depression lasting more than two weeks, seeking professional assessment is important.

Where reasonable people still disagree

• Whether treating depression with antidepressants reduces cardiovascular event rates in RCTs, or whether the observational association reflects residual confounding.
• The relative efficacy of exercise versus pharmacotherapy for depression across different severity levels.
• Whether the cardiovascular risks of depression are primarily driven by biological mechanisms or by the behavioural consequences of depression (poor diet, inactivity, smoking).