Does exercise help with depression?

Exercise is one of the interventions with the strongest evidence for depression. Meta-analyses show that regular aerobic exercise has effectiveness comparable to antidepressants for mild to moderate depression, and it boosts the effect of medication when the two are combined.

How exercise helps with depression: — It raises serotonin, dopamine, and norepinephrine, the same neurotransmitters targeted by antidepressants — It releases BDNF (brain-derived neurotrophic factor), which promotes neuroplasticity and helps grow the hippocampus (often smaller in depression) — It reduces systemic inflammation, which is elevated in many forms of depression — It improves sleep quality, which in turn improves mood — It builds a sense of accomplishment and self-efficacy, especially important when depression has eroded self-esteem

The central challenge: depression causes fatigue, anhedonia, and a loss of motivation, making it very hard to start anything, especially exercise. The solution is to start with the smallest possible dose: a 10-minute walk beats zero. Building up gradually is more sustainable than setting big goals that end up feeling paralyzing.

Type of exercise: aerobic exercise (walking, running, cycling, swimming) has the strongest evidence. But any movement beats none. 3-5 times a week, 30-45 minutes, is the most well-supported recommendation.