Brazil nuts — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
Extremely high in fat and selenium — a few nuts can cause selenium toxicity. Avoid.
Short answer
Yes, Brazil nuts are a higher risk for cats. While walnuts are also high in fat and can cause stomach upset, Brazil nuts are extremely high in selenium, which can cause toxicity from just a few nuts. Avoid giving any to your cat, and watch for vomiting, diarrhea, or lethargy—if you see these signs, call your vet.