Higher dietary phytochemical index linked to lower cancer risk — but observational design limits causal inference
A 2025 systematic review and meta-analysis [WP0124] finds that higher scores on the dietary phytochemical index (DPI) — a measure of phytochemical-rich food intake — are associated with reduced risk of certain cancers, based on pooled observational data. Separately, organic milk contains higher n-3 PUFA, CLA, and α-tocopherol but lower iodine and selenium than conventional milk [WP0043] — a clinically relevant trade-off for UK clients where iodine insufficiency is documented. Practical implication: promote diverse plant food intake for cancer risk reduction, but do not advise exclusive organic dairy without assessing iodine status.