Dietary carrot intake is associated with a decreased risk of breast cancer.
In order to investigate the relation between carrot intake and the risk of breast cancer, a comprehensive search spanning databases up until September 2017 was performed. Studies were included if they contained risk estimates for the breast cancer risk related to carrot consumption. To collate and analyze data from different studies, random-effects models were used. Publication biases were determined through means such as Begg's funnel plot and Egger's regression asymmetry test.
From the search, a total of 10 articles were found that met the criteria and these accounted for 13,747 cases. Upon reviewing these studies, it was noted that the risk of breast cancer was lower for the group with the highest carrot intake when compared with the group with the lowest carrot intake. This association was more pronounced in case-control studies than in cohort studies. The associations did not appear to differ significantly by geographical region, the quality of the study or the method used to assess exposure. Completing the analysis without any single study showed that each study has a minimal effect on the summarised risk. The methodology therefore suggests and supports a link between high dietary carrot intake and reduced breast cancer risk.
