Brazil Nuts
Food · Fat & Oil · Food, Typed Supps
One Brazil nut can pack more selenium than you need for the whole day, so a couple of nuts is plenty.
Stage by stage
- Chewing (Mouth): Chewing breaks down the nut's dense fat and protein matrix, releasing selenium-bound compounds for digestion.
- Gastric Breakdown (Stomach): Stomach acid and lipase begin breaking apart fats and proteins, freeing selenomethionine for absorption.
- Absorption (Small Intestine): The small intestine absorbs selenium, magnesium, copper, and healthy fats into the bloodstream.
- Selenium Delivery (Bloodstream & Tissues): Selenium is carried to tissues throughout the body and built into antioxidant and thyroid-regulating selenoproteins.
Timing
Brazil nuts don't need to be eaten with a particular meal, but having them alongside food rather than on an empty stomach can ease digestion given their high fat content.
Time to effect
- Days to Weeks: Blood selenium levels and antioxidant enzyme activity can rise within days of eating Brazil nuts regularly, while whole-body selenium status takes weeks to months to fully shift.
Allergens
Contains: Tree nuts. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Keto, Gluten-free. Depends on the product: Low-FODMAP.
Satiety
50 on the satiety index, where white bread is 100 — low. Modelled from the Holt et al. (1995) measurements.
Environmental footprint
0.4 kg CO2e and 4134 litres of freshwater per kg, matched to "Nuts" in Poore & Nemecek (2018), Science 360.
Cost band
Pricey — roughly £16 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 689.8
- Protein: 14.4g
- Carbohydrate: 2.4g
- of which sugars: 2.1g
- Fat: 68.5g
- of which saturated: 14.8g
- Fibre: 8.5g
- Sodium: 2mg
Food vs. supplement
One or two Brazil nuts typically provide as much or more selenium than a standard supplement dose, but because their selenium content is unpredictable, a supplement offers more consistent dosing for anyone targeting a specific amount.
Kitchen tip
Keep Brazil nuts refrigerated or frozen in a sealed container — their high fat content makes them go rancid faster than most nuts at room temperature.
Common myth
"Eating a handful of Brazil nuts every day is a safe, natural way to maximize your selenium and antioxidant intake." In reality: Brazil nuts contain roughly 68-91 mcg of selenium per nut against an adult RDA of just 55 mcg/day, so eating more than one or two nuts daily can push intake toward or past the 400 mcg/day tolerable upper limit, risking selenosis symptoms like hair loss and brittle nails.
Recipes that use it
More in Fat & Oil
In the glossary
Sources