If exercise could be put in a pill, it would be the most prescribed and most effective pharmaceutical in history. The evidence for its mental health benefits is not fringe or preliminary — it is among the most robust in all of medicine. Exercise significantly reduces symptoms of depression and anxiety, improves cognitive function, protects against dementia, builds stress resilience, and improves sleep quality, with effect sizes that are clinically meaningful and mechanisms that are increasingly well understood.
What Exercise Does to the Brain
During exercise, the brain releases endorphins (reducing pain and producing euphoria), dopamine (increasing motivation and pleasure), norepinephrine (improving alertness), and serotonin (stabilising mood). These neurochemical changes explain the well-documented immediate mood lift. The longer-term structural effects are equally significant. Regular exercise increases production of BDNF (brain-derived neurotrophic factor) — a protein that promotes neuron growth, survival, and synaptic connectivity. In the hippocampus, which is critically involved in learning, memory, and emotional regulation and shows shrinkage in depression, exercise consistently increases volume and connectivity. Depression reduces hippocampal volume; exercise both prevents and reverses this. Exercise also reduces amygdala reactivity and strengthens prefrontal cortex control over emotional responses — meaning better top-down regulation of anxiety, frustration, and distress.
Exercise vs Antidepressants: The Evidence
A 2023 systematic review in the BMJ — analysing 97 reviews covering 1,039 trials and 128,119 participants — found that exercise was more effective than or comparable to antidepressants and psychotherapy for depression and anxiety. Effects were larger for higher-intensity exercise and supervised sessions. This is not a minor finding in an obscure journal — it's the largest evidence synthesis ever conducted, published in one of medicine's most prestigious publications. It argues that exercise should be prescribed alongside or before pharmacological intervention in appropriate cases, and that it is currently dramatically underutilised in clinical practice.
How Much, What Type, How Often
For general mental health benefit, 150 minutes of moderate-intensity or 75 minutes of vigorous exercise weekly — the same as physical health recommendations. For depression treatment, three sessions of 45–60 minutes at moderate-to-vigorous intensity per week is the most common protocol in positive trials. For cognitive function and dementia prevention, aerobic exercise has the strongest evidence, but strength training also produces significant benefits for executive function and memory. Any exercise is better than none, and consistency over months matters more than occasional high-intensity effort.
Starting and Sustaining
The hardest part is starting. The second hardest is the first two to three weeks, before the mood benefits become consistent and self-reinforcing. After that, the neurochemical rewards of regular exercise become motivating in themselves — and the cost of missing a session (reduced mood, energy, sleep quality) becomes perceptible enough to sustain the habit. The most effective strategy is finding an activity that provides social connection alongside exercise — team sport, a running club, a group fitness class — since social accountability is the single most powerful predictor of sustained exercise adherence.
Fuel Your Exercise and Mental Wellbeing With Vanda's Kitchen
The nutritional principles that support exercise and mental wellbeing are most effectively implemented through consistent daily food choices rather than occasional efforts. Vanda's Kitchen's office lunch delivery — certified halal, 100% nut-free, freshly prepared Filipino-inspired food — provides a daily nutritional foundation that supports your training and performance. Lean proteins for muscle maintenance, complex carbohydrates for sustained energy, fresh vegetables for micronutrients: the building blocks of a genuinely sports-supportive diet delivered to your desk every working day.
Our EC4 kitchen near St Paul's Cathedral serves City professionals who balance demanding careers with active lifestyles. Fresh, nutritious food that fuels the working day and the training session — without the processed alternatives that undermine both. Order for your office or read our healthy office lunch delivery guide.
For related reading, see lunch break mental health guide and nutrition and depression science. WhatsApp us or get in touch.
Fresh, Nutritious Food at Vanda's Kitchen
Vanda's Kitchen near St Paul's Cathedral EC4 provides one of the most nutritionally complete and allergen-safe food options in the City of London. Our Filipino-inspired menu is built around lean proteins, fresh vegetables, and complex carbohydrates — the nutritional combination that supports sustained energy, cognitive performance, and the various health outcomes covered in this article. Our food is certified halal, prepared in a 100% nut-free kitchen, and fully allergen-labelled, making it appropriate for the broadest range of dietary requirements in London's diverse workforce.
For City professionals who want genuinely nutritious daily lunches without leaving the office, our Freedom Tray delivery service provides fresh, labelled food to your desk from our EC4 kitchen. Our Selfridges Food Hall presence confirms the quality standard we maintain. To order for your team or to discuss corporate delivery, view our team lunch options, WhatsApp us, or send an enquiry. Read our healthy office lunch delivery guide for more on what we offer.