Lifestyle Factors Affecting Health
Why Lifestyle Factors Matter
Unlike inherited conditions, lifestyle factors are things people can control. The choices a person makes about what they eat, how active they are, and whether they smoke or misuse substances directly affect their health and wellbeing. The Component 3 specification identifies four key lifestyle factors: nutrition, physical activity, smoking, and substance misuse.
Each lifestyle factor can have both positive and negative effects on health and wellbeing. A balanced diet supports good physical health, while a poor diet increases the risk of obesity, type 2 diabetes, and cardiovascular disease. The exam will often ask you to explain how a specific lifestyle factor affects an individual across the PIES categories.
Nutrition
Nutrition refers to the food and drink a person consumes and how the body uses it. A balanced diet provides the right amounts of carbohydrates, proteins, fats, vitamins, minerals, fibre, and water. Good nutrition supports physical growth, brain function, emotional stability, and the energy needed to socialise and participate in activities.
A balanced diet positively affects all areas of PIES: physical (healthy weight, energy, strong immune system), intellectual (brain function, concentration), emotional (stable mood, positive self-image), social (energy to socialise, shared meals with others).
Poor nutrition includes both malnutrition (not getting enough nutrients) and over-nutrition (eating too much of the wrong foods). Malnutrition can weaken the immune system, slow growth in young people, and cause tiredness. Over-nutrition leads to obesity, which increases the risk of type 2 diabetes, CVD, and joint problems. Both affect emotional wellbeing through low energy and poor self-image, and social wellbeing through reduced ability to participate in activities.
Physical Activity
Regular physical activity is essential for maintaining good health. The UK Chief Medical Officers recommend that adults do at least 150 minutes of moderate-intensity activity per week, while children and young people should aim for 60 minutes of moderate-to-vigorous activity every day.
The benefits of regular physical activity span all areas of PIES. Physically, it strengthens the heart, muscles, and bones, helps maintain a healthy weight, and reduces the risk of CVD, type 2 diabetes, and some cancers. Intellectually, exercise improves concentration, memory, and cognitive function by increasing blood flow to the brain. Emotionally, physical activity releases endorphins (natural mood-boosting chemicals), reduces stress and anxiety, and improves self-esteem. Socially, team sports and group exercise classes provide opportunities to meet people and build friendships.
A lack of physical activity (a sedentary lifestyle) has the opposite effect. It increases the risk of obesity, weakens muscles and bones, reduces concentration, worsens mood, and limits social opportunities. Prolonged inactivity is linked to higher rates of depression and anxiety.
Smoking
Smoking tobacco is one of the biggest preventable causes of ill health in the UK. Cigarettes contain nicotine (which is highly addictive), tar (which damages the lungs), and carbon monoxide (which reduces the amount of oxygen the blood can carry).
Physical: Smoking causes lung cancer, chronic obstructive pulmonary disease (COPD), heart disease, and strokes. It reduces lung capacity, causes breathlessness, and ages the skin prematurely. Intellectual: Reduced oxygen supply to the brain can impair concentration and memory. Emotional: While smokers often say smoking reduces stress, the addiction cycle actually increases anxiety between cigarettes. Worrying about health consequences adds further stress. Social: Smoking can cause social exclusion as non-smokers may avoid being around smoke. The cost of cigarettes reduces money available for social activities. Smoking bans in public places limit where smokers can go.
Smoking is the leading preventable cause of death in the UK. It damages the lungs, heart, and blood vessels, and the nicotine in tobacco creates a powerful addiction that makes quitting extremely difficult.
Substance Misuse
Substance misuse means using substances in a way that is harmful to health. The specification names three substances: alcohol, cannabis, and opiates (e.g. heroin).
Alcohol: Excessive drinking damages the liver (leading to cirrhosis), increases the risk of heart disease and some cancers, impairs judgement and coordination, and can lead to addiction (alcoholism). It affects emotional wellbeing through mood swings and depression, and social wellbeing through damaged relationships, aggression, and financial problems. The UK CMO guidelines recommend no more than 14 units per week for both men and women.
Cannabis: This is an illegal drug that can be smoked or eaten. It affects concentration, memory, and motivation. Long-term use is linked to mental health problems including anxiety, paranoia, and psychosis. It can also damage the lungs when smoked. Socially, cannabis use can lead to legal problems, reduced employment prospects, and damaged relationships.
Opiates (e.g. heroin): Opiates are highly addictive drugs that depress the central nervous system. Heroin use carries risks of overdose (which can be fatal), infections from sharing needles (including HIV and hepatitis), collapsed veins, and severe constipation. Addiction dominates the user’s life, leading to loss of employment, breakdown of relationships, criminal behaviour to fund the habit, and homelessness. Opiates have devastating effects across all areas of PIES.
Substance misuse does not just affect the individual — it impacts families, friendships, and communities. Children growing up with a parent who misuses substances may experience neglect, emotional trauma, and instability. The financial cost of addiction can push families into poverty.