Abstract
Diet, body weight, physical activity, sedentary behavior, and breastfeeding are modifiable factors influencing the cancer burden in the European Union, shaped by underlying social, commercial, environmental, and behavioral conditions. Excess body weight has reached epidemic levels, significantly influenced by widespread intake of sugar-sweetened beverages and ultra-processed foods rich in sugar, fat, and salt. Consumption of red and processed meat also commonly exceeds dietary recommendations. Physical inactivity and prolonged sedentary behavior are widespread. Breastfeeding rates vary widely across Europe but are generally low, particularly in high-income countries. To reduce cancer risk, the European Code Against Cancer, 5th edition (ECAC5) recommends a diet rich in whole grains, vegetables, legumes, and fruits, while limiting red meat and avoiding processed meat. Intake of vegetables, legumes, and fruits prevents aerodigestive tract cancers, while diets high in whole grains and low in red and processed meat reduce colorectal cancer risk. Avoiding excess body weight through diet and physical activity, and limiting prolonged sitting, decreases risk of numerous cancers. Promoting and supporting sustained breastfeeding contributes to lowering breast cancer risk. Key policy interventions, such as fiscal incentives, urban planning, marketing restrictions, and public awareness campaigns, are central to creating supportive environments for cancer prevention.