Cruciferous vegetables: cancer protective mechanisms of glucosinolate hydrolysis products and selenium.
Level 5 - mechanism / opinion, no new human data
Narrative review of biological mechanisms without systematic search methodology or original human data.
PubMed 15035868 · doi:10.1177/1534735403261831
What was done
Narrative review describing the epidemiological rationale and biological mechanisms underlying the anticarcinogenic properties of cruciferous vegetables, with a specific focus on glucosinolate hydrolysis products (sulforaphane and indole-3-carbinol) and vegetable-derived selenium.
What was found
The abstract reports an estimate from the American Institute of Cancer Research that increasing fruit and vegetable consumption to 5 servings per day could reduce cancer rates by up to 20%. No primary trial data or specific effect sizes are reported. Identified protective mechanisms include induction of phase II detoxification enzymes, inhibition of phase I carcinogen-activating enzymes, altered estrogen metabolism, protection against reactive oxygen species, reduced tumor growth, and apoptosis induction.
Why it matters
Synthesizes mechanistic pathways explaining why cruciferous vegetables and their bioactive metabolites are associated with chemopreventive effects in epidemiological research.
Limits
As a narrative review, it lacks a systematic literature search, formal study inclusion criteria, and meta-analytic synthesis. The abstract provides no quantitative clinical data or sample size information regarding human efficacy or bioavailability.
Cited by
- supports Sulforaphane slows down phase I detoxification and speeds up phase II detoxification.