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walnuts
Nuts & Seeds
Is walnuts high in nickel?
Is walnuts high or low in nickel? See its exact rating, how much counts as a portion, and its FODMAP, salicylate, oxalate and diet compatibility in one place.
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Sensitivity notes
Why nickel food checker matters
Nickel is a metal found in many foods including chocolate, nuts, and leafy greens. People with nickel allergy (often showing as contact dermatitis) may also react to dietary nickel, causing skin and digestive symptoms.
- Avoid cooking acidic foods in stainless steel cookware
- Canned foods often have higher nickel content
- Chocolate, nuts, and legumes are common high-nickel foods
- First-draw water from taps may be higher in nickel - let it run
- Vitamin C may help reduce nickel absorption
Sensitivities
What walnuts contains
FODMAPs
Histamine & Amines
Plant compounds
Irritants
Additives
Allergens
Diet fit
Where walnuts fits
Therapeutic diets
Lifestyle diets
Religious diets
What to know about walnuts
Walnuts are genuinely anti-inflammatory thanks to their plant omega-3s, but they are also very high in oxalate and high in nickel, so the same handful that is good for your heart can be a real problem if you are prone to kidney stones or have a nickel allergy. That trade-off, a strong nutrition upside sitting on top of two clear triggers, is what sets walnuts apart from a plain snack nut.
Watch for
- Very high in oxalate, one of the higher-oxalate nuts, worth limiting if you are managing calcium-oxalate kidney stones
- High in nickel, a common flare trigger for people with systemic nickel allergy (nut, seed and wholegrain foods tend to be nickel-rich)
- A tree nut, so a top allergen and not eosinophilic-oesophagitis friendly if nuts are on your elimination list
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Compare similar foods to build a personalized list of swaps that work for your system.
Nickel Guide
Everything you need to know about nickel sensitivity and smart food choices.
Nickel is a metal found in many foods including chocolate, nuts, and leafy greens. People with nickel allergy (often showing as contact dermatitis) may also react to dietary nickel, causing skin and digestive symptoms.
Sensitivity varies widely. What triggers one person may be fine for another. Track your reactions to find your personal threshold.
These foods are generally well-tolerated for Nickel sensitivity:
View all safe options
These foods are high in nickel and may trigger symptoms:
View full list
If you're sensitive to Nickel, consider these strategies:
- 1Avoid cooking acidic foods in stainless steel cookware
- 2Canned foods often have higher nickel content
- 3Chocolate, nuts, and legumes are common high-nickel foods
- 4First-draw water from taps may be higher in nickel - let it run
- 5Vitamin C may help reduce nickel absorption
Pro tip: Keep a food diary to track your reactions. The Triggerbites app makes this easy with automatic pattern detection.
Want personalized tracking?
Download Triggerbites to log meals, track symptoms, and discover your unique triggers.
Get the AppFAQ
Is walnuts high in Nickel?
Nickel: higher signal - consider smaller servings or swaps.
Can I still eat walnuts if I'm sensitive to Nickel?
Best to avoid or test carefully with a small amount.
What else should I check?
Check Tree Nuts, Oxalates, and AIP next for a fuller picture.