Caffeine and coffee effects on brain health in people
What it found
In people, caffeine boosted alertness, mood and concentration, and lifelong coffee drinking was linked to lower risks of stroke and memory diseases.
Food regulators consider up to 400 mg daily acceptable.
What they found
Studies in people
Alertness and mood
Caffeine can boost alertness, well-being, focus and mood in people. It may also help limit depression.
Sleep and anxiety
Caffeine might disturb sleep, but only in sensitive people. A small group of very sensitive individuals may feel more anxious after taking it.
Dependence and withdrawal
Caffeine does not appear to cause dependence. However, a minority of people do notice withdrawal symptoms when they stop.
Headache relief
When taken with regular painkillers, caffeine can make them work better for headaches and migraines in people.
Brain disease risk
Drinking coffee throughout life was linked to less cognitive decline in people. It was also tied to a lower chance of stroke, Parkinson's disease and Alzheimer's disease.
Other findings
Daily intake limits
Food regulators say up to 200 mg in one sitting, about 2½ cups of coffee, or 400 mg a day, about 5 cups, is fine. Older adults do not need to stop drinking coffee.
What the authors conclude
- They say daily coffee and caffeine can fit into a balanced diet.
- They advise that older people do not need to give up their coffee or caffeine.
How it was done
Doctors often get questions from patients about whether coffee or caffeine affects the brain. The authors wanted to gather what is known so they could advise patients clearly.
The authors gathered and summarised existing research on how coffee and caffeine affect the brain. They looked at benefits, harms and links to brain diseases over a lifetime. The summary does not state how many studies were included.
What it can’t tell you
- We summarised it from the abstract only.
- This work gathers past research rather than running new trials.
- It can show links between lifelong coffee drinking and lower disease risk, but it cannot prove coffee causes those benefits.
The paper
- Title
- Effects of coffee/caffeine on brain health and disease: What should I tell my patients?
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people
- Summarised from
- Abstract only
- Cite
- Nehlig A (2016). Effects of coffee/caffeine on brain health and disease: What should I tell my patients?. Practical neurology. doi:10.1136/practneurol-2015-001162PubMed 26677204DOI
Summary written 1 Oct 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error