Sleep
How Much Sleep Adults Actually Need, and Why Consistency Matters
Seven to nine hours covers most adults, but a steady wake time may do more for how you feel than the total on any single night.
Become the Captain of Your Health
Take Command of Your Health
Explore practical health guides, understand symptoms and conditions, use interactive tools, follow the latest medical breakthroughs, and build healthier habits one day at a time.
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Six doors into better health
Whatever brought you here — a symptom, a new prescription, a number your doctor mentioned, or a habit you want to change — start with the one that fits.
Symptoms
Understand common symptoms and when to seek care.
ExploreConditions
Learn about common health conditions and risk factors.
ExploreMedications
Explore drug guides, safety, side effects, and comparisons.
ExploreHealthy Living
Improve nutrition, fitness, sleep, stress, and daily habits.
ExploreHealth Tools
Use calculators, trackers, and planning tools.
ExploreFuture of Health
Explore AI, wearables, longevity, and new medical breakthroughs.
ExploreFeatured from Health Captain
What our editors are reading this week
Pulled live from the Health Captain blog. If the connection is unavailable, these hand-picked guides take their place.
AI & Healthcare
AI in Clinical Care: What Has Actually Changed for Patients
Ambient documentation and imaging triage are in real use. Diagnosis by chatbot is not. A look at where the evidence currently sits.
Longevity
Longevity: Separating the Evidence From the Marketing
No supplement has been shown to extend human lifespan. Six questions help you evaluate any longevity claim before you spend money on it.
Medications
GLP-1 Medications: What to Ask Before You Start
How this drug class works, what the common side effects are, and the questions worth raising with a prescriber about duration and monitoring.
Cancer & Prevention
Cancer Screening: What It Can Do, and What It Costs You
Colorectal screening from 45 is among the highest-value tests available. Overdiagnosis and false positives are the other half of the conversation.
Heart Health
DASH or Mediterranean: Which Eating Pattern Should You Follow?
Both have strong cardiovascular evidence and they overlap heavily. Consistency with either matters far more than choosing between them.
Heart Health
Measuring Blood Pressure at Home Without Inflating the Number
Poor technique can add 10 to 20 mmHg. Six steps make home readings accurate enough to guide treatment decisions.
Latest
New on Health Captain
Health news, research worth your attention, and new guides — updated as they publish.
Heart Health
Measuring Blood Pressure at Home Without Inflating the Number
Poor technique can add 10 to 20 mmHg. Six steps make home readings accurate enough to guide treatment decisions.
Nutrition
Most Adults Get Half the Fiber They Need. Here Is the Fix.
Guidance lands around 25 to 38 grams a day. Legumes are the densest everyday source and the easiest single upgrade to make.
Diabetes
Type 2 Diabetes: What the Diagnosis Means and What Comes Next
A plain-language look at how the condition develops, which numbers get tracked, and the categories of treatment used to manage it.
Healthy Aging
Strength Training After 50: Why Two Days a Week Is the Target
Muscle is the body's largest glucose sink and the foundation of independence. Trials show real gains well into the eighties and nineties.
Mental Wellness
The Three Habits With the Most Consistent Mental Health Evidence
Sleep, movement, and connection are not a substitute for treatment, but they measurably affect mood and are available on a bad week.
Health News
Health Guidance Updates Worth Knowing About This Year
Screening ages, activity targets, and alcohol guidance have all shifted in recent years. A summary of what changed and why.
Health guides
Deep, practical guides — organised the way health actually works
Each cluster is a set of connected guides. Read one, and the next thing worth reading is right there.
Everyday Health
The five or six habits that do most of the work: sleep, food, water, movement, stress, and mental wellbeing.
Metabolic Health
How weight, blood sugar, insulin sensitivity, cholesterol, and blood pressure fit together — and what actually moves them.
Healthy Aging
Protecting strength, balance, bone, and brain so that added years stay useful years.
Heart Health
The numbers that drive cardiovascular risk, and the eating and activity patterns with the strongest evidence behind them.
Men's Health
Screenings worth keeping on schedule, cardiovascular risk in men, and mental health that too often goes unspoken.
Women's Health
Screening schedules across the decades, bone health through menopause, and heart disease in women.
Conditions
Plain-language guides to common conditions
Every condition page follows the same structure — what it is, symptoms, risk factors, how it is diagnosed, treatment categories, prevention, warning signs, and questions to take to your clinician.
Diabetes & Blood Sugar
Type 2 Diabetes
Type 2 diabetes is a long-term condition in which blood glucose (blood sugar) stays higher than normal because…
Read the guide High Blood PressureHigh Blood Pressure
High blood pressure, or hypertension, means the force of blood against artery walls stays elevated over time.…
Read the guide High CholesterolHigh Cholesterol
High cholesterol means too much of certain fatty particles circulate in the blood, especially LDL cholesterol,…
Read the guide Sleep DisordersInsomnia
Insomnia is difficulty falling asleep, staying asleep, or waking too early despite adequate opportunity to…
Read the guide Mental HealthDepression
Depression, or major depressive disorder, is a medical condition involving persistently low mood or loss of…
Read the guide Arthritis & Joint HealthOsteoarthritis
Osteoarthritis is a whole-joint condition in which cartilage gradually breaks down, bone underneath changes,…
Read the guide Respiratory HealthAsthma
Asthma is a long-term condition in which the airways become inflamed, narrow, and produce extra mucus, causing…
Read the guide Digestive HealthGERD
GERD, or gastroesophageal reflux disease, is chronic reflux of stomach contents into the esophagus that causes…
Read the guideHealth tools
Tools that do something useful, then get out of the way
Eleven calculators, trackers and planners. They run entirely in your browser — nothing is uploaded, nothing is sold, and you can export or delete your data in one click.
Guided
Symptom Explorer
Work out what you are noticing and how urgently it deserves attention.
Open tool InstantBMI Calculator
With the context BMI alone leaves out.
Open tool Saves locallyBlood Pressure Tracker
Log readings, see the trend, print it for your appointment.
Open tool DailyHealth Journal
Sleep, mood, movement, food and symptoms in one daily entry.
Open tool InstantSleep Planner
Bedtimes that end on a sleep cycle, plus a wind-down schedule.
Open tool PrintableMedication List Builder
One printable list of everything you take, including supplements.
Open toolYour data stays in your browser
Every tracker on Health Captain saves to this device's local storage only. We cannot see it, we do not receive it, and clearing your browser data deletes it. Export to CSV any time.
Health Captain
Play. Learn. Level Up Your Health.
Five health zones, six daily missions, and badges you can only get by actually doing the thing. Earn Health Points, keep a streak, and pick up one useful fact a day.
Progress saves in your browser. No account, no email, no ads.
Nutrition Harbor
Zone 1
Fitness Ridge
Zone 2
Mind Garden
Zone 3
Sleep Station
Zone 4
Prevention Command Center
Zone 5
Healthy living
The habits that move the needle
Five things account for most of the difference you can make yourself: how you sleep, how you move, what you eat, how you handle stress, and whether you keep up with screening.
Nutrition
Good nutrition is built on dietary patterns rather than individual foods or nutrients.…
ExploreFitness & Exercise
Adults should aim for 150 to 300 minutes a week of moderate aerobic activity, or 75 to 150…
ExploreSleep
Most adults need 7 to 9 hours of sleep a night, and consistent timing matters as much as…
ExploreMental Wellness
Mental wellness is the day-to-day capacity to handle stress, connect with people, and…
ExploreStress Management
Stress is the body's response to demand, driven largely by adrenaline and cortisol. Short…
ExploreHeart Health
Cardiovascular disease is the leading cause of death in most high-income countries and is…
ExploreWeight & Metabolism
Body weight is regulated by biology, environment, and behaviour together. A 5 to 10% weight…
ExploreHealthy Aging
Healthy aging is about protecting function, not just adding years. Strength and balance…
ExploreMedication center
Understand what you have been prescribed
What a medicine is for, how its class generally works, what side effects are common, and what to ask before you start. Education — never dosing advice, and never a substitute for your prescriber or pharmacist.
Biguanide
Metformin
Usually the first medicine prescribed to lower blood sugar in type 2 diabetes, often alongside changes to…
Read the guide GLP-1 receptor agonists (and the dual GIP/GLP-1 receptor agonist tirzepatide)GLP-1 Receptor Agonists
A class of injectable and oral medicines used to lower blood sugar in type 2 diabetes and, for several of…
Read the guide ACE inhibitor (angiotensin-converting enzyme inhibitor)Lisinopril
Lowers blood pressure, and is also used after a heart attack and in heart failure and diabetic kidney disease…
Read the guide HMG-CoA reductase inhibitor (statin)Atorvastatin
Lowers LDL cholesterol and reduces the risk of heart attack and stroke in people with cardiovascular disease…
Read the guide Selective serotonin reuptake inhibitor (SSRI)Sertraline
Used to treat depression, several anxiety disorders, obsessive-compulsive disorder, post-traumatic stress…
Read the guide Proton pump inhibitor (PPI)Omeprazole
Reduces stomach acid production to treat reflux and heartburn, heal ulcers and esophagitis, and protect the…
Read the guide
Brand-Name vs. Generic Medicines
Medication Safety at Home
Drug Interactions
Lowering Prescription Costs
Education, not prescribing adviceMedication pages on Health Captain describe what a medicine is generally used for and what to discuss with your care team. They never include dosing, and they cannot account for your medical history, kidney or liver function, pregnancy, or the other medicines you take. Always follow the instructions on your label and ask your pharmacist.
Discover
The Future of Health Is Already Here
AI-assisted imaging reading scans alongside radiologists. Continuous monitors that catch a problem days before symptoms. Drugs designed by models. We follow it closely — and we tell you plainly which parts are real.
AI & Healthcare
Where AI is genuinely useful in medicine today — and where it is still a demo.
ExploreWearables
What consumer devices measure well, what they only estimate, and what to ignore.
ExplorePersonalized Medicine
Genomics, pharmacogenomics, and treatment matched to the individual.
ExploreDigital Health
Remote care, digital therapeutics, and the health data privacy questions they raise.
Explore
AI & Healthcare
AI in Clinical Care: What Has Actually Changed for Patients
Ambient documentation and imaging triage are in real use. Diagnosis by chatbot is not. A look at where the evidence currently sits.
Wearables
What Wearables Measure Well, and What They Only Estimate
Step counts and heart rate are reasonably reliable. Sleep stages, stress scores, and recovery metrics deserve more scepticism.
Brain Health
What Is Good for the Heart Is Good for the Brain
Blood pressure control has the strongest evidence among modifiable factors for protecting cognition. Hearing loss is close behind.
Longevity
Living longer is mostly about living better, earlier
The longevity field is loud, and much of it is unproven. Our hub separates what the evidence supports from what is being sold — with no anti-ageing claims we cannot stand behind.
Healthspan, not just lifespan
The years you spend healthy matter more than the number on the certificate.
Muscle and strength
Strength and muscle mass predict independence later better than almost anything else you can train.
Cardiovascular and metabolic health
Blood pressure, lipids, and glucose control compound over decades.
Sleep and the brain
Consistent, sufficient sleep is repeatedly linked with better cognitive ageing.
Social connection
Loneliness carries measurable health risk. Connection is not a soft factor.
Preventive medicine
The screening you actually attend beats the supplement you read about.
Medical breakthroughs
Health News & Breakthroughs
What changed this month in medicine, and what it means for an ordinary person — not a press release rewritten.
Cancer & Prevention
Cancer Screening: What It Can Do, and What It Costs You
Colorectal screening from 45 is among the highest-value tests available. Overdiagnosis and false positives are the other half of the conversation.
Medical Breakthroughs
Reading Medical Breakthrough Headlines Without Getting Misled
Which species, how many people, how long, and compared with what. Four questions that filter most overstated research coverage.
Cancer & Prevention
Cancer Risk: The Factors You Can Actually Change
Tobacco, excess weight, alcohol, UV exposure, and certain infections. HPV and hepatitis B vaccination prevent cancers outright.
Popular
What readers come back to
The guides and explainers people share, bookmark and return to most.
Heart Health
Measuring Blood Pressure at Home Without Inflating the Number
Poor technique can add 10 to 20 mmHg. Six steps make home readings accurate enough to guide treatment decisions.
Nutrition
Most Adults Get Half the Fiber They Need. Here Is the Fix.
Guidance lands around 25 to 38 grams a day. Legumes are the densest everyday source and the easiest single upgrade to make.
Diabetes
Type 2 Diabetes: What the Diagnosis Means and What Comes Next
A plain-language look at how the condition develops, which numbers get tracked, and the categories of treatment used to manage it.
Healthy Aging
Strength Training After 50: Why Two Days a Week Is the Target
Muscle is the body's largest glucose sink and the foundation of independence. Trials show real gains well into the eighties and nineties.
Mental Wellness
The Three Habits With the Most Consistent Mental Health Evidence
Sleep, movement, and connection are not a substitute for treatment, but they measurably affect mood and are available on a bad week.
Health News
Health Guidance Updates Worth Knowing About This Year
Screening ages, activity targets, and alcohol guidance have all shifted in recent years. A summary of what changed and why.
Trusted resources
Where our information comes from
We write in plain language, but we do not invent the underlying facts. These are the organisations we lean on, and we link straight to them so you can read the original.
Centers for Disease Control and Prevention
MedlinePlus (US National Library of Medicine)
National Institutes of Health
American Heart Association
American Diabetes Association
American Cancer Society
US Preventive Services Task Force
World Health Organization
How we work
Read our editorial policy, medical review policy, sources policy and corrections policy. We label content as medically reviewed only when a credentialed professional has actually reviewed it.
In an emergency
If you believe you are experiencing a medical emergency, call emergency services immediately (911 in the United States). For mental health crises in the US, call or text 988 to reach the Suicide & Crisis Lifeline. See our emergency resources.