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Who studies what?
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No single field has the answer to everything. A psychologist, a psychiatrist, a neuroscientist and a sociologist each look at wellbeing from a different angle. Every lesson here names the fields its ideas come from.
Clinical psychology
Studies: Behaviour, Thinking, Emotion, Psychological therapies such as CBT.
- What it can tell you
- How thoughts, feelings and behaviour interact, and which practical techniques help people cope and change.
- What it can’t
- What medication someone needs, or anything about a physical illness.
Psychiatry
Studies: Mental-health conditions, Diagnosis, Treatment, including medication.
- What it can tell you
- When a pattern of experience is a condition, and what treatment options exist.
- What it can’t
- Much about ordinary everyday wellbeing — its focus is illness and treatment.
Neuroscience
Studies: The brain and nervous system, Attention, learning and memory, Stress systems.
- What it can tell you
- The mechanisms underneath experience — for example what happens in the body during stress.
- What it can’t
- Exactly what you should do day to day. Brain findings are often over-sold in popular writing.
Behavioural science
Studies: Habits, Cues and friction, Decision-making, How environments shape behaviour.
- What it can tell you
- Why people do what they do, and how small changes to a situation change behaviour.
- What it can’t
- What you should want. It explains the how, not the why.
Sleep science
Studies: Sleep, Circadian rhythms, Sleep disorders.
- What it can tell you
- How sleep works, what disturbs it, and which habits and treatments improve it.
- What it can’t
- The exact amount of sleep you personally need — people vary.
Exercise science
Studies: Physical activity, Fitness, How the body adapts to exercise.
- What it can tell you
- How much and what kind of movement benefits health, and how to build it up safely.
- What it can’t
- How to exercise safely with a particular medical condition — that needs a professional who knows you.
Nutrition science
Studies: Food and nutrients, Diet and health, Eating patterns.
- What it can tell you
- Which broad eating patterns are linked with better health.
- What it can’t
- A precise diet for you. Much nutrition research is observational, and single studies are often over-reported.
Public health
Studies: Health across whole populations, Prevention, Healthy environments.
- What it can tell you
- What protects the health of large groups of people, and how environments and policies shape health.
- What it can’t
- What will happen to one particular person.
Sociology
Studies: Relationships and groups, Communities and family, Work, money and culture, Digital culture.
- What it can tell you
- How the world around a person — their relationships, work, income and culture — shapes their health and choices.
- What it can’t
- How one individual should feel or act. It looks at patterns, not prescriptions.
A note on “experts say”
Be careful with any claim that starts “a neuroscientist says…” or “doctors say…”. Ask which field, which evidence, and whether that field actually studies the question. Neurology, for example, is the medicine of nerve and brain disease — it is not the field that studies procrastination or everyday stress.