# Mediterranean and plant-forward dietary patterns

Source: https://onco.cc/technologies/mediterranean-plant-forward-diet/  
OnCo record `mediterranean-plant-forward-diet` (Technology). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Diets built around vegetables, wholegrains, legumes, nuts, fish and olive oil, with little red or processed meat, are linked with lower cancer risk and better survival after diagnosis. The evidence is strong for the pattern, weak for any single food.

## Summary

The World Cancer Research Fund Continuous Update Project and the American Cancer Society 2020 guideline converge on a dietary pattern rather than individual nutrients: high in wholegrains, vegetables, fruit and legumes; limited red meat, and processed meat, sugar-sweetened drinks and alcohol avoided. Prospective cohorts show 10-20% lower total cancer incidence and lower cancer mortality with high adherence to Mediterranean or healthy-plant-based indices; colorectal cancer has the most consistent association (fibre, wholegrains, dairy protective; red and processed meat harmful). Randomised evidence is thinner: PREDIMED (a cardiovascular trial) reported fewer breast cancers on Mediterranean diet with extra-virgin olive oil in a small secondary analysis; WHEL and WINS in breast cancer survivors showed that a low-fat or high-vegetable diet did not reduce recurrence on its own. Observational associations after diagnosis (CALGB 89803 in colon cancer: Western pattern associated with recurrence) are consistent but confounded by overall health behaviour.

## Fields

- Kind: Technology
- Status: established
- Last checked: 2026-09-08
- Principle: High fibre feeds a diverse gut microbiome and short-chain fatty acid production; low glycaemic load and energy density reduce insulin and adiposity; polyphenols and unsaturated fats lower inflammation; displacement of processed meat lowers exposure to nitrosamines and haem iron.
- Strengths: Consistent across cohorts, sites and dietary indices; Also prevents cardiovascular disease and diabetes, the main competing causes of death in survivors; Aligns with sustainability
- Limitations: Randomised trials with cancer endpoints are few and mostly null; Residual confounding by wealth, smoking and activity; Effect sizes per person are modest

## Sources

- Wikipedia: https://en.wikipedia.org/wiki/Mediterranean_diet
- ACS nutrition and physical activity guideline 2020: https://doi.org/10.3322/caac.21591

## Connected records

- collections: [American Cancer Society (ACS)](https://onco.cc/collections/american-cancer-society/)
- cancers: [Colorectal cancer](https://onco.cc/cancers/colorectal/), [Gastric & gastro-oesophageal junction cancer](https://onco.cc/cancers/gastric/), [Hepatocellular carcinoma](https://onco.cc/cancers/hcc/), [HR-positive / HER2-negative breast cancer](https://onco.cc/cancers/breast-hr-positive/), [Prostate cancer](https://onco.cc/cancers/prostate/)
- fronts: [Diet, Exercise & Lifestyle](https://onco.cc/fronts/nutrition-lifestyle/), [Prevention & Risk](https://onco.cc/fronts/prevention/)
- technologies: [Coffee and tea intake](https://onco.cc/technologies/coffee-intake-cancer/), [Dietary fibre and the gut microbiome for immunotherapy response](https://onco.cc/technologies/dietary-fibre-microbiome-io/), [Exercise & lifestyle oncology](https://onco.cc/technologies/exercise-oncology/), [Red and processed meat reduction](https://onco.cc/technologies/red-processed-meat-reduction/), [Soy foods and breast cancer](https://onco.cc/technologies/soy-breast-cancer/), [Ultra-processed food and sugar-sweetened drinks](https://onco.cc/technologies/ultra-processed-food-ssb/)
- institutions: [International Agency for Research on Cancer (IARC / WHO)](https://onco.cc/institutions/iarc/)
- terms: [Dietary pattern scores (Mediterranean, HEI, AHEI, DASH, WCRF/AICR)](https://onco.cc/terms/dietary-pattern-scores/), [Energy balance](https://onco.cc/terms/energy-balance/), [Glycaemic index and glycaemic load](https://onco.cc/terms/glycaemic-index/)
- trials: [WHEL (Women's Healthy Eating and Living)](https://onco.cc/trials/whel/)
- bottlenecks: [Prevention we already have is not deployed](https://onco.cc/bottlenecks/b-prevention-adoption/)
- key papers: [American Cancer Society guideline for diet and physical activity for cancer prevention](https://onco.cc/key-papers/paper-rock-ca-cancer-j-clin/)
- pathways: [Lipid synthesis, uptake & cholesterol](https://onco.cc/pathways/lipid-metabolism-cancer/)
- roadmaps: [Diet, exercise and lifestyle roadmap: causes established → interventions that disappointed → exercise proven as treatment](https://onco.cc/roadmaps/nutrition-lifestyle-roadmap/)

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