Single arm feasibility study to test uptake, retention to the intervention and qualitative process analysis of a family based intervention for mothers at increased risk of breast cancer

A mother's weight loss could lower her breast cancer risk, but only if she and her family can stick with the programme. This study tests whether a family-based weight loss intervention is feasible for mothers with overweight or obesity who are at increased risk of breast cancer. Many weight loss programmes fail because they do not account for family dynamics, competing demands, or the social context of eating. The researchers will first review existing evidence and interview families to identify what works and what gets in the way. Then they will run a small trial to measure how many mothers sign up, stay in the programme, and complete it. Patient and public involvement will guide every stage. If the intervention proves feasible, it could lead to a larger trial testing whether family-centred weight loss actually reduces cancer risk in high-risk women. Success would mean shifting from individual diet advice to a model that treats the household as the unit of change. That could make prevention programmes more realistic and effective for women whose cancer risk is shaped by weight, but whose daily choices are shaped by their families.