Anti-Inflammatory Diet in Oncology

Mediterranean and plant-forward dietary patterns that reduce systemic inflammation and support treatment

Key Points

• High adherence to a Mediterranean-pattern diet is associated with 10–15% lower all-cause cancer mortality and 20–30% lower CRC, breast, and endometrial cancer risk in prospective cohorts.
• Key principles: abundant vegetables, fruits, legumes, whole grains, olive oil, nuts; moderate fish; limited red/processed meat, refined carbohydrates, and added sugars.
• The PREDIMED Plus trial demonstrated 23% lower cancer incidence in high-risk patients on a Mediterranean diet with olive oil vs. low-fat diet at 7 years.
• Dietary inflammatory index (DII) — a validated scoring tool — allows clinicians to assess a patient's current diet and set measurable anti-inflammatory targets.
• Processed meat is classified as Group 1 carcinogen (IARC); red meat as Group 2A. Limit processed meat to zero and red meat to <350 g/week.
• Specific components with strongest evidence: cruciferous vegetables (sulforaphane), berries (anthocyanins), olive oil (oleocanthal, OA), and oily fish (EPA/DHA).

The Anti-Inflammatory Diet Framework

Chronic low-grade inflammation is recognized as a hallmark of cancer biology, driving tumor initiation, promotion, angiogenesis, and metastasis. The tumor microenvironment is rich in inflammatory cytokines (TNF-α, IL-6, IL-1β, COX-2), and systemic inflammation — measured by markers like CRP, IL-6, and the neutrophil-to-lymphocyte ratio — is a validated prognostic biomarker across multiple cancer types. Dietary patterns profoundly modulate systemic inflammation. The Dietary Inflammatory Index (DII) — developed by Shivappa et al. (2014) and validated against inflammatory biomarkers in…

Evidence in Cancer Patients

**Cancer Prevention:** The PREDIMED study (7,447 participants at cardiovascular risk, 7-year follow-up) demonstrated a 23% lower cancer incidence in the Mediterranean diet + extra-virgin olive oil group vs. a control low-fat diet group. PREDIMED Plus (ongoing, 6,874 participants) has confirmed 22% lower cancer mortality at interim analysis. **During Active Treatment:** While randomized trials of dietary interventions specifically during cancer treatment are limited, observational data consistently show that patients with the highest Mediterranean diet adherence scores during treatment have…

Nutritional Counseling in Oncology Practice

Oncology patients face multiple nutritional challenges: treatment-induced anorexia, taste changes, mucositis, nausea, malabsorption, sarcopenia, and weight loss. Anti-inflammatory dietary guidance must be individualized and prioritize nutritional adequacy above dietary perfection. **Priority Hierarchy During Active Treatment:** 1. Maintain adequate calorie intake and prevent unintentional weight loss 2. Preserve lean body mass (adequate protein: 1.2–2.0 g/kg/day during treatment) 3. Minimize pro-inflammatory processed foods and added sugars when appetite permits 4. Introduce…