Your blood test shows a high CRP. Maybe your doctor flagged it, maybe you noticed it yourself while trying to understand your results. Either way, it's worth taking seriously — not because high CRP means you're sick right now, but because chronic low-grade inflammation is one of the most significant modifiable risk factors for long-term health outcomes.
The good news: diet has strong, well-documented effects on CRP.
Medical disclaimer: High CRP can have many causes, including acute infection or serious illness. If your CRP is significantly elevated (above 10 mg/L) and you haven't recently had an infection or injury, consult your doctor to rule out underlying conditions before assuming it's lifestyle-related.
What Is CRP?
C-reactive protein (CRP) is a protein produced by the liver in response to inflammation anywhere in the body. It's sensitive (rises within hours of an inflammatory trigger), non-specific (elevated by many different conditions), and reliably measurable in a standard blood test.
Two Types of CRP Tests
Standard CRP: Useful for detecting infections, autoimmune flares, and acute illness. Normal is < 5 mg/L.
High-sensitivity CRP (hsCRP): Measures lower levels of chronic inflammation; used to assess cardiovascular risk.
| hsCRP (mg/L) | Cardiovascular risk |
|---|---|
| < 1.0 | Low |
| 1.0 – 3.0 | Moderate |
| > 3.0 | High |
| > 10.0 | Acute inflammation |
Causes of Elevated CRP
Lifestyle-related:
- Excess visceral fat — adipose tissue actively secretes inflammatory cytokines
- Poor sleep — even one week of 6-hour nights raises hsCRP measurably
- Chronic stress
- Sedentary behaviour
- Smoking
- Alcohol in excess
Dietary-related:
- High intake of ultra-processed food and refined carbohydrates
- Low omega-3 to omega-6 ratio (typical of Western diets)
- Excessive added sugar
- Low dietary fibre
How Much Can Diet Actually Move CRP?
Substantially. In people with chronically elevated levels, dietary intervention can reduce hsCRP by 20–40% over 8–12 weeks. The interventions with the strongest evidence:
- Mediterranean diet pattern — multiple RCTs show 20–35% reductions in hsCRP
- Omega-3 fatty acids (EPA+DHA) — significant CRP reduction at doses of ≥ 2g/day
- Dietary fibre increase — consistently associated with lower CRP
- Reduction in ultra-processed food — strong association in prospective cohort studies
- Polyphenol-rich foods — extra virgin olive oil, berries, dark chocolate, green tea
Foods That Reduce CRP
Fatty Fish (Omega-3 — the Strongest Evidence)
EPA and DHA directly compete with pro-inflammatory arachidonic acid pathways in the cell membrane.
| Fish | EPA+DHA per 100g | Notes |
|---|---|---|
| Mackerel | 2.2–2.6g | Affordable, widely available |
| Herring | 1.7–2.1g | Very popular in Germany, Netherlands, Scandinavia |
| Salmon (wild) | 1.5–2.0g | Farmed is lower but still useful |
| Sardines (tinned in oil) | 1.5–1.8g | Cheap, practical, shelf-stable |
| Anchovies | 1.5g | Used widely in Mediterranean cooking |
Target: 2–3 servings of oily fish per week.
Extra Virgin Olive Oil
Oleocanthal in EVOO inhibits the same enzymes as ibuprofen (COX-1 and COX-2). Studies show EVOO consumption is independently associated with lower CRP. Use it generously as your primary cooking fat and dressing base.
Polyphenol-Rich Vegetables and Fruit
| Food | Key anti-inflammatory compounds |
|---|---|
| Blueberries, cherries, strawberries | Anthocyanins |
| Broccoli, Brussels sprouts | Sulforaphane |
| Tomatoes | Lycopene (increased by cooking) |
| Garlic and onion | Quercetin, allicin |
| Dark chocolate (85%+) | Flavonoids |
| Green tea | EGCG |
| Turmeric | Curcumin (add black pepper to improve bioavailability) |
Legumes and Whole Grains
Dietary fibre feeds bacteria that produce short-chain fatty acids (particularly butyrate), which directly reduce intestinal permeability and systemic inflammation.
Target: 30+ grams of fibre per day from lentils, chickpeas, beans, oats, whole grain bread.
Walnuts
Walnuts contain the highest omega-3 content of any nut (as ALA), plus vitamin E and polyphenols. Regular walnut consumption reduces CRP.
Foods That Raise CRP
Ultra-Processed Food
This is the clearest dietary driver of chronic inflammation in European populations. The effect is over and above what's explained by sugar, fat, or calorie content — suggesting the processing itself drives inflammation.
Identifying ultra-processed food: If a product's ingredient list contains more than 5–6 ingredients, includes emulsifiers (lecithin, carrageenan), flavour enhancers, or modified starches — it's ultra-processed.
Refined Carbohydrates and Added Sugar
High glycaemic load diets are associated with elevated CRP via blood glucose spikes, insulin signalling, and advanced glycation end-products (AGEs).
Industrial Seed Oils in Excess
Refined sunflower, corn, and soybean oils are very high in omega-6. The omega-6:omega-3 ratio in Western European diets is approximately 15:1; the ancestral ratio is estimated at 4:1. The solution: increase omega-3 (fatty fish, walnuts, flaxseed) while reducing industrial seed oils.
A Week of Anti-Inflammatory Eating
Day 1: Overnight oats with walnuts, blueberries, flaxseed → Sardine and tomato whole grain toast → Mackerel with roasted vegetables and olive oil
Day 2: Greek yoghurt with cherries and dark chocolate → Lentil and spinach soup → Salmon fillet with wild rice and broccoli
Day 3: Eggs with tomatoes and herbs → Chickpea and vegetable salad with olive oil → Chicken with turmeric, ginger, and cauliflower rice
Day 4: Smoothie with spinach, blueberries, ginger → Herring on rye with cucumber → Beef (lean) with lentilles du Puy and roasted peppers
Day 5: Porridge with walnuts and berries → White bean and vegetable soup with sourdough → Mackerel with sweet potato and green salad
What Else Reduces CRP (Beyond Diet)
- Exercise: Even 30 min walking 5x/week reduces hsCRP by approximately 0.5–1.5 mg/L over 8 weeks
- Sleep: Less than 6 hours per night consistently raises inflammatory markers
- Visceral fat reduction: Even modest weight loss (5–10%) significantly reduces CRP
- Smoking cessation: Quitting reduces CRP within weeks
Frequently Asked Questions
How quickly does CRP respond to dietary changes?
Measurably within 4–8 weeks of consistent dietary improvement. Maximum effect from diet alone typically seen at 12–16 weeks.
What CRP level should I aim for?
For hsCRP: below 1.0 mg/L is optimal. Below 3.0 is acceptable. If above 3.0, lifestyle and dietary intervention is warranted. Above 10 mg/L, rule out acute illness first.
Should I take omega-3 supplements?
If you eat oily fish 2–3 times per week, supplementation benefit is marginal. If you eat little or no fish, supplementing with 1–2g EPA+DHA daily is well-supported for CRP reduction.
My CRP is high but I feel fine. Should I be worried?
Chronic low-grade inflammation rarely causes dramatic symptoms — it operates quietly and manifests as accelerated risk over years. Feeling fine now doesn't mean the signal should be ignored.
The Bottom Line
High CRP is your metabolism telling you that inflammation is a current priority. The most evidence-backed response: a whole-food Mediterranean-pattern diet rich in oily fish, olive oil, legumes, and vegetables — combined with regular movement, adequate sleep, and reduced ultra-processed food.
Diet alone can reduce hsCRP by 20–40%. That's meaningful, quantifiable, and entirely within your control.
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