ZACH / Foundations · The Health Map
What does it mean
to be healthy?
A strong body. A settled mind. A life you can take part in. Health includes all of these—and the conditions that make them possible.
More than a measurement
One number cannot
describe a life.
You can be physically fit and feel isolated. You can live with a long-term condition and still have meaningful activities, relationships and possibilities. Health is broader than the absence of a diagnosis.
The WHO Constitution connects physical, mental and social wellbeing. This map turns that broad perspective into eleven areas to explore. The arrangement is ZACH’s educational framework; it is not a validated assessment.
Eleven connected dimensions
Select a dimension below. The numbered connections represent ideas, not measured causal effects or a personal score.
Showing Physical capacity.
01 / BODY
Physical capacity.
The strength, endurance, balance and movement options you can draw on.
Capacity helps you meet a demand: carrying a bag, walking to the station, getting up from the floor. The useful question is how your abilities relate to the life you want to lead.
participants in the LIFE trial
In LIFE, sedentary adults aged 70–89 who could initially walk 400 metres were assigned to structured activity or health education. Over 2.6 years on average, major mobility disability occurred in 30.1% versus 35.5%.
Keep in mind. This was an older population with physical limitations. It does not predict your personal future or prove that one exercise prevents disability.
Pahor et al. · JAMA · 2014 · randomised trial ↗Which everyday ability would you most like to keep or build?
02 / BODY
Cardiometabolic health.
How the cardiovascular system and metabolic regulation are functioning, including blood pressure, blood lipids and glucose regulation.
Feeling fit is useful information, but it cannot tell you everything about your blood pressure or metabolic risk. Clinical measurements and personal history add a different kind of evidence.
adults in the Diabetes Prevention Program
The DPP enrolled adults at high risk of diabetes. An intensive programme combining activity, diet and weight-loss goals reduced diabetes incidence by 58% relative to placebo over an average 2.8 years.
Keep in mind. A supported, multi-part intervention in a high-risk group; the effect cannot be attributed to exercise alone or applied as an individual guarantee.
Knowler et al. · NEJM · 2002 · randomised trial ↗Which measurements would be useful to discuss with your usual clinician?
03 / BODY
Sleep & recovery.
Sleep involves duration, timing, regularity and quality. Recovery also depends on the demands placed on you.
The same training plan can feel very different after a settled week of sleep or several disrupted nights. A wearable estimate is one clue, alongside how you feel and function.
hours: an adult consensus recommendation
The AASM/Sleep Research Society consensus recommends regularly obtaining at least seven hours for adults aged 18–60. It was developed from a review of evidence and expert assessment.
Keep in mind. A population recommendation, not a precise dose for every person. More time in bed is not automatically better sleep; persistent sleep concerns deserve appropriate assessment.
Watson et al. · Sleep · 2015 · consensus statement ↗Is the main difficulty opportunity, timing, interruptions or daytime sleepiness?
04 / MIND
Brain & mental health.
Thinking, remembering, emotional wellbeing and the ability to respond to everyday demands. These overlap, but are not interchangeable.
A brain scan, a memory task and a person’s wellbeing describe different things. Understanding that distinction makes exciting research more useful.
older adults in an exercise-and-memory trial
Erickson and colleagues randomised sedentary older adults without dementia to aerobic exercise or stretching for one year. The aerobic group’s anterior hippocampal volume increased by about 2%.
Keep in mind. A small, selected sample and a regional brain measure. This is not evidence that exercise alone prevents dementia or replaces mental-health care.
Erickson et al. · PNAS · 2011 · randomised trial ↗What helps you feel engaged, supported and able to concentrate?
05 / CONTEXT
Social connection.
The relationships, support and sense of belonging available to you. Loneliness is a felt gap; social isolation describes limited contact.
Being surrounded by people and feeling connected are different experiences. Relationship quality, practical help and opportunities to participate all matter.
people globally report loneliness
The WHO Commission on Social Connection reported a global loneliness estimate of 15.8% in 2025. Its report distinguishes relationship structure, support and quality.
Keep in mind. A population estimate assembled across settings. It cannot diagnose loneliness or establish a simple number of contacts everyone needs.
WHO · 2025 · global evidence report ↗Who or what helps you feel part of something?
06 / CONTEXT
Environment.
The physical, social and economic conditions around you: housing, air, work, safety, accessibility and available resources.
A quiet bedroom, a safe walking route or time between appointments changes what is practical. Health is shaped by systems and circumstances as well as individual choices.
of the global population breathes air above WHO limits
WHO reports that almost everyone worldwide breathes air exceeding its air-quality guideline limits. Exposure is uneven, with particularly high burdens in lower-income settings.
Keep in mind. This global indicator is not a measurement of the air where you are today. A personal routine cannot solve every environmental or structural barrier.
WHO · air-pollution data and guidance ↗Which change around you would make a useful habit easier?
07 / CONTEXT
Genetics.
Inherited DNA variation contributes to differences between people. Traits develop through many biological and environmental influences.
A genetic contribution does not make a trait fixed. It also does not mean a consumer DNA report can identify your best exercise programme.
of supervised training in HERITAGE
HERITAGE studied the training response of 481 sedentary adults from 98 White families. VO₂max responses clustered within families; the model’s maximal heritability estimate was 47%.
Keep in mind. This estimate concerns variation in that population and programme. It is not the percentage of one person’s fitness determined by genes; shared family factors also matter.
Bouchard et al. · J Appl Physiol · 1999 · family study ↗Are you using what you observe about yourself, or assuming a genetic limit?
08 / PRACTICE
Health behaviours.
Repeated actions such as movement, eating, sleep routines, tobacco use and alcohol consumption, shaped by opportunity and support.
A workable routine needs to fit your resources. Starting with a manageable change is often more useful than designing an ideal week you cannot repeat.
moderate-intensity minutes per week in WHO guidance
WHO’s adult guidance combines aerobic activity with muscle-strengthening activity on at least two days per week. Some activity is better than none, and activity can be built up gradually.
Keep in mind. These are public-health recommendations, not a personalised prescription or a guarantee of health. Age, conditions, preferences and capacity affect the appropriate starting point.
WHO · 2020 · physical activity guidelines ↗What is the smallest change you could repeat in an ordinary week?
09 / PRACTICE
Function & participation.
What you can actually do in daily life, including the activities and roles that matter to you.
Two people with similar strength can have different independence if one has stairs, support or accessible transport. Adapting a task or environment can be as meaningful as changing physical capacity.
a relationship, not a health score
WHO’s healthy-ageing framework describes functional ability through a person’s intrinsic capacity, their environment and the interaction between them.
Keep in mind. This is a conceptual framework. It does not provide a single universal disability threshold or predict an individual life course.
WHO · 2020 · healthy-ageing framework ↗Which activity matters to you, and what would help you take part?
10 / CARE
Preventive health.
Appropriate actions to reduce risk or detect specific problems early, including vaccination and evidence-based screening.
A test is useful when its result can lead to a worthwhile decision. More testing can also create false alarms, overdiagnosis and unnecessary follow-up.
included in a review of general health checks
A 2019 Cochrane review found that general health checks had little or no effect on total mortality. Fifteen of the 17 trials reported outcomes, involving 251,891 participants.
Keep in mind. This finding concerns broad checks offered to adults; it does not dismiss investigation of symptoms, condition-specific care or recommended targeted screening.
Krogsbøll et al. · Cochrane · 2019 · systematic review ↗What decision would this test change, and what are its possible downsides?
11 / CARE
Oral health.
The health and function of the mouth, teeth and surrounding tissues, including comfort, eating and speaking.
Oral health belongs in the same conversation as everyday function and wellbeing. Access to dental care, fluoride, hygiene and wider conditions all play a role.
people estimated to be affected by oral disease
WHO’s March 2025 fact sheet estimates that oral diseases affect nearly 3.7 billion people globally. It identifies untreated tooth decay as a major burden.
Keep in mind. A global burden estimate is not an individual risk prediction. Links between oral and other diseases do not mean every association is causal.
WHO · 2025 · global oral-health facts ↗Is pain, discomfort or access to care making eating or daily life harder?
A broader perspective
Health is personal.
Its conditions are shared.
What you can draw on.
Physical and mental resources can change. Learning, appropriate training and support may expand the options available to you.
What life makes possible.
Time, income, housing, caring responsibilities and access to care influence the choices that are realistic. Difficulty is not a character flaw.
What matters to you.
A useful goal begins with a life: taking part in work, family, relationships, interests or daily activities on terms that matter to you.
One study, in proportion
What does a difference
actually look like?
In the LIFE trial, the outcome was losing the ability to complete a 400-metre walk. It was a specific measure of mobility, not a verdict on someone’s overall health.
5.4 percentage points.
That is the absolute difference between the groups. The time-to-event analysis reported a hazard ratio of 0.82 (95% confidence interval 0.69–0.98). These are different ways to describe the result.
About two-thirds of participants were women. Participants were sedentary and had physical limitations; the programme combined walking, strength, balance and flexibility. It was not a trial of one isolated exercise.
Understand study results ↗Put the map to use
Choose a question.
Then choose a next step.
Pick one domain that feels relevant. Name an activity or concern in ordinary language. Consider what is within your control, what needs support and what belongs with a qualified health professional.
For example: “I want the walk to work to feel easier.” That question may lead to physical capacity, sleep, a more workable route or a conversation about a symptom. The map helps you widen the question before narrowing the plan.
Explore your current activity · Find a small practice · See personal movement support
Is this a health assessment?
No. The map organises ideas and questions. It does not diagnose a condition, estimate your life expectancy or replace clinical assessment. It collects no health answers.
Does “healthy” mean being free of illness?
Illness matters, but it is not the only dimension. Function, participation, wellbeing and support can remain meaningful when someone lives with a chronic condition or disability. The map is an invitation to understand the whole context, not a label for who counts as healthy.
Why are there eleven domains?
Eleven is an editorial choice that makes several important perspectives visible. Other frameworks divide health differently. The domains overlap; their position and size do not indicate importance, causal strength or a hierarchy.
Which services does ZACH currently provide?
ZACH offers movement, training and education with Zacharias Razvi, a final-semester physiotherapy student. Authorised physiotherapy and medical screening are not currently offered. See the available services and prices.
Read beyond the map
Sources & scope.
A deliberately mixed evidence base: trials answer specific intervention questions; reviews combine studies; population estimates describe scale; frameworks help organise ideas. They are labelled separately throughout the map.
- WHO Constitution Broad definition and public-health perspective.
- Pahor et al. · JAMA · 2014 · randomised trial Physical capacity: evidence and limitations in the selected panel.
- Knowler et al. · NEJM · 2002 · randomised trial Cardiometabolic health: evidence and limitations in the selected panel.
- Watson et al. · Sleep · 2015 · consensus statement Sleep & recovery: evidence and limitations in the selected panel.
- Erickson et al. · PNAS · 2011 · randomised trial Brain & mental health: evidence and limitations in the selected panel.
- WHO · 2025 · global evidence report Social connection: evidence and limitations in the selected panel.
- WHO · air-pollution data and guidance Environment: evidence and limitations in the selected panel.
- Bouchard et al. · J Appl Physiol · 1999 · family study Genetics: evidence and limitations in the selected panel.
- WHO · 2020 · physical activity guidelines Health behaviours: evidence and limitations in the selected panel.
- WHO · 2020 · healthy-ageing framework Function & participation: evidence and limitations in the selected panel.
- Krogsbøll et al. · Cochrane · 2019 · systematic review Preventive health: evidence and limitations in the selected panel.
- WHO · 2025 · global oral-health facts Oral health: evidence and limitations in the selected panel.
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Education from ZACH · An original conceptual map, not a WHO assessment tool.