Aflatoxins: If nuts (especially frequently imported peanuts or pistachios) are stored improperly, i.e., in excessively humid and warm conditions, the mold Aspergillus flavus can develop. This mold produces toxins called aflatoxins, which are highly carcinogenic and can damage the liver.
However, the EU and many other countries have strict limits and controls in place for imported nuts. As long as you buy fresh nuts, store them in a dry place, and immediately discard any nuts that taste bitter, musty, or rancid, there is no everyday risk.
Conclusion
Don’t let headlines like these worry you. A handful of unsalted nuts a day is an excellent and healthy addition to your diet!
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