The Numbers
According to the World Health Organization, the five most significant preventable risk factors for cancer are tobacco use, alcohol consumption, excess body weight, physical inactivity, and certain infections. Together, these account for a substantial share of the global cancer burden.
Tobacco alone kills more than 8 million people annually and contains at least 69 known carcinogens. Alcohol is a Group 1 carcinogen, the highest classification, linked to seven different cancer types, including breast, liver, and colorectal cancer, and is responsible for an estimated 740,000 new cases every year. Even light to moderate alcohol use is not without risk: in the EU alone, light-to-moderate drinking was associated with approximately 23,000 new cancer cases in a single year.
Excess body weight and physical inactivity are closely linked. Overweight and obesity caused an estimated 3.4% of all cancers in 2012, including around 110,000 breast cancer cases annually. The mechanisms are well understood: adipose tissue produces hormones and inflammatory signals that promote tumour growth. Regular movement counteracts many of these pathways independently of weight loss.
Why This Matters Beyond Cancer
The behaviours that reduce cancer risk are not cancer-specific. Physical activity reduces the risk of type 2 diabetes, cardiovascular disease, and depression. Reducing alcohol reduces liver disease, mental health conditions, and several additional cancer types. Quitting smoking adds years of life across nearly every major cause of death.
This is why public health researchers focus on modifiable behavioural risk factors rather than diseases in isolation. The same handful of behaviours: move more, drink less, smoke less, eat better, sleep adequately. These appear on nearly every list of evidence-based interventions for nearly every major non-communicable disease. That is not coincidence. It reflects the deep interconnection between lifestyle and long-term health.
The Gap Between Knowing and Doing
Most people already know that smoking causes cancer. Most people know that exercise is good for them. The problem is not knowledge. It is the friction between knowing and consistently doing.
Large-scale public health campaigns communicate evidence well. What they struggle to do is reach people in the moments that matter: the Tuesday afternoon when you could walk to the coffee shop instead of drive, the Friday night when you pour a second glass without really thinking about it, the week when work gets busy and movement drops off without you noticing.
That gap, between population-level knowledge and individual daily behaviour, is what Easeful Health is designed to address. Not by lecturing, not by adding friction, but by making the healthy choice the easier one. A step-counting game that makes walking feel like something. A daily check-in that makes patterns visible before they become habits. A journey app that turns cumulative movement into something meaningful.
A Note on Scope
Easeful Health does not claim to prevent cancer. These tools are not medical interventions, and individual outcomes vary enormously. What the evidence does support is that populations who move more, drink less, and stay aware of their behavioural patterns experience measurably better health outcomes on average. Our goal is to contribute to that shift, one small, consistent behaviour at a time.
If the numbers in this post feel abstract, consider this: 30–50% of cancers preventable is not a statement about individual fate. It is a statement about what becomes possible when a population shifts its everyday habits, even modestly. That is the scale of opportunity. And it starts with decisions that feel small.