Are there risks associated with Brazil nuts?
Written by
Chen Jialiang
Reviewed by
Prof. William Dalton, Ph.D.Brazil nuts are highly nutritious and beneficial, but they also carry some risks that require caution. The main risk comes from consuming too many nuts, as this can lead to selenium toxicity, which can occur with higher amounts, possibly in the form of eating just 4 nuts in a day! Tree nut allergies pose a greater risk to those affected. Improper storage, which degrades oils and leads to rancidity, also decreases their nutritional benefits. Being aware of these risks will enable you to enjoy Brazil nuts safely and securely.
Toxicity Prevention
- Strict 1-3 nuts daily limit
- Recognize early symptoms: garlic breath, hair loss
- Immediate cessation if symptoms appear
Allergy Precautions
- Complete avoidance for tree nut allergy sufferers
- Epinephrine availability for accidental exposure
- Clear labeling in shared kitchens
Storage Protocols
- Refrigeration in airtight containers
- Three-month freshness window
- Discard nuts with yellow oil or bitter taste
Special Populations
- Pregnant women: limit to 1 nut daily
- Thyroid patients: monitor selenium levels
- Children: pediatric consultation before introduction
The selenium toxicity that develops rapidly with excessive consumption of Brazil nuts starts with gastrointestinal upset and garlic breath. Chronic excessive consumption will cause hair loss, brittle nails, and neurological dysfunction. Selenosis can cause kidney injury in severe cases. Blood tests can confirm blood selenium levels, assuming symptoms are present.
Brazil nuts can be life-threatening for individuals with tree nut allergies. Throat swelling and difficulty breathing can occur quickly, within minutes after exposure. In general, individuals with these allergies may also cross-react to walnuts and pecans. Carrying auto-injectable epinephrine is strongly recommended for individuals with known allergies. Be vigilant in reading food labels, because Brazil nuts can be present in unexpected food items.
Rancidity can compromise the nutritional content and create undesirable compounds in Brazil nuts. These nuts have a high fat content, which makes them susceptible to oxidation, especially when they're exposed to light and elevated temperatures. Rancid Brazil nuts will have an off, bitter flavor, and can develop yellowish oil. Rancid nuts will leave this rancid/oily residue in your digestive tract with no health benefits. All of this can be avoided with proper storage.
Custom approaches for the special needs of Brazil nut consumers. Pregnant women have limits on Brazil nuts due to selenium interactions with fetal development. Thyroid disorders would need to be coordinated with your endocrinologist for reliance on any Brazil nuts, since selenium interacts with the efficacy of medications. Infants and toddlers should be considered only after consultation with a pediatrician. Recommendations on Brazil nuts should be directed to your respective healthcare provider.
Read the full article: Top 10 Benefits Brazil Nuts Provide
