4 Nuts That Could Harm Your Brain (And 4 That Protect Against Dementia)

2. Moldy Peanuts

Peanuts can sometimes be contaminated with aflatoxins, which are toxic substances produced by certain molds. Long-term exposure has been linked to liver damage and may also contribute to oxidative stress that affects brain health.

3. Salted and Processed Nuts

Heavily salted or flavored nuts often contain excessive sodium, artificial additives, and unhealthy oils. High sodium intake has been associated with increased blood pressure, which can impair blood flow to the brain over time.

4. Candied or Sugar-Coated Nuts

Nuts covered in sugar or caramel may taste appealing, but the added sugars can lead to spikes in blood glucose. Over time, this can contribute to insulin resistance and inflammation—both of which are linked to cognitive decline.