MYP Biology: Health, Disease & Lifestyle FAQ

Health, disease and lifestyle is an MYP 4-5 Biology unit exploring how the body defends itself against pathogens, how non-communicable diseases develop, and how choices like diet, exercise and smoking affect long-term health. It sits under key concepts from the MYP Sciences guide, linking biology to everyday decisions your body responds to.

Expect pathogens (bacteria, viruses, fungi, protists), transmission routes, the body's defences (skin, white blood cells, antibodies), and non-communicable diseases like cardiovascular disease and type 2 diabetes. Risk factors such as diet, smoking and inactivity tie it together. Exact content varies between schools since MYP units are teacher-designed around shared objectives.

Infectious diseases are caused by pathogens — bacteria, viruses, fungi or protists — and spread between people, like influenza or malaria. Non-communicable diseases, such as type 2 diabetes or coronary heart disease, aren't transmitted between people; they usually develop over years from genetics, age or lifestyle factors like diet and smoking.

Lifestyle choices — diet, exercise, smoking, alcohol — change your statistical risk of developing a non-communicable disease, though risk isn't the same as certainty. In this unit, you're expected to read epidemiological data, spot a correlation between a habit and a disease, then explain the biological mechanism connecting them rather than just naming the link.

A top MYP grade in this unit comes from pairing accurate biology vocabulary (Criterion A) with genuine evaluation of secondary data — judging a source's reliability, not just describing its graph (Criterion C). Students who score highest usually connect the science to a real, named public health example, such as WHO obesity figures.

Expect command terms straight from the MYP: Sciences guide — 'describe' (give a detailed account), 'explain' (give reasons or causes), 'discuss' (offer a balanced review of different views), 'evaluate' (weigh strengths and limitations), and 'justify' (give valid reasons for a conclusion). Misreading these costs marks even when your biology content is correct.

Common mistake: treating a strong correlation in a graph as automatic proof of causation — like assuming a country with more fast-food outlets must have 'caused' its obesity rate, without mentioning confounding variables such as income or activity levels. Examiners under Criterion C specifically look for you to name at least one confounder.

It can be — MYP on-screen eAssessments, introduced by the IB in 2016 for MYP Year 5 students, draw questions from across the Sciences subject group, so health and disease content is fair game. Most schools, though, assess this unit through internal criterion-based tasks rather than the optional eAssessment route.

All four MYP Sciences criteria can apply: A (Knowing and Understanding) tests recall of pathogens and disease mechanisms, B (Inquiring and Designing) if you design an investigation, C (Processing and Evaluating) for interpreting health data, and D (Reflecting on the Impacts of Science) fits naturally given the ethical and lifestyle angle.

It builds the foundation for DP Biology's human physiology content, where immunity, disease defence and homeostasis are treated in far more molecular detail. According to the IB, the current DP Biology guide is first examined in 2025, and students who've absorbed MYP concepts like pathogen types and risk factors adapt faster to that depth.

MYP treats disease and lifestyle conceptually — evaluating sources, discussing ethics, linking biology to daily choices. DP Biology goes quantitative: antigen-antibody mechanisms, epidemiological statistics, and internal-assessment-style data analysis. Think of MYP as building the vocabulary and reasoning habits that DP then applies to genuinely complex physiological and statistical problems.

Look for resources organised by MYP criterion rather than just topic, since success here depends on how a student argues a case, not only on what they recall. Strong revision materials combine concise notes on pathogens and non-communicable diseases with practice questions mirroring Criteria A-D wording, plus mark schemes showing what full marks look like.

Costs vary widely — many schools provide free subject guide extracts and past internal assessment tasks, while dedicated revision platforms typically charge a modest monthly or annual subscription for structured notes, worksheets and practice questions. Compare what's included, such as criterion-mapped content and mock papers, rather than judging on price alone.