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BACKGROUND/OBJECTIVES: Breast cancer is the most common malignancy among women globally, with survival rates improving due to earlier detection and better treatment. As a result, cancer survivors now constitute a growing segment of the population, and addressing their long-term health and well-being is a public health priority. Diet and nutrition represent modifiable factors that may influence recurrence, comorbidities, and quality of life (QoL), yet clear evidence-based guidance remains limited. This umbrella review thus synthesized evidence from published reviews on the effects of dietary and nutrition interventions among breast cancer survivors. METHODS: Following a prospectively registered protocol in PROSPERO (CRD420251185022), six databases (PubMed, EMBASE, Scopus, Cochrane Library, PsycINFO and CINAHL) were systematically searched for systematic reviews/meta-analyses evaluating dietary or nutrition interventions in adult breast cancer survivors. Eligible reviews reported anthropometric, metabolic, psychosocial, or survival outcomes. Methodological quality was appraised using the AMSTAR-2 tool, and findings were narratively synthesized. RESULTS: Nine systematic reviews encompassing more than 10,000 breast cancer survivors were included. Interventions ranged from general dietary counselling and structured weight-management programmes to Mediterranean-style dietary patterns, dietitian-led primary care, multiple health behaviour change interventions, mobile nutrition apps, and broader lifestyle programmes incorporating diet. Across reviews, interventions consistently improved diet quality and fruit-vegetable intake, produced modest but meaningful reductions in weight, body mass index, and body fat, and enhanced several QoL domains (e.g., fatigue, physical functioning, body image). Higher adherence to Mediterranean-style diets was associated with lower all-cause and non-breast cancer mortality, though certainty was limited by observational designs. However, evidence for long-term maintenance, survival endpoints, and ethnically diverse or low- and middle-income populations remains sparse. CONCLUSIONS: Dietary and nutrition interventions, particularly structured, dietitian-supported, and Mediterranean-style approaches, contribute to improved diet quality, sustainable weight control, and enhanced QoL among breast cancer survivors. Integrating nutrition care into survivorship pathways should be the focus of future research.
Tan et al. (Sun,) studied this question.