Nuts are seen as one of the best natural snacks: convenient, energizing, and rich in nutrients. Yet, not all nuts benefit the brain equally. Some, when consumed in excess or under certain conditions, can affect memory, concentration, and even increase inflammatory processes that harm cognitive health.

On the other hand, other nuts provide fatty acids, antioxidants, and neuroprotective substances that science associates with a lower risk of cognitive decline and dementia.

In today article, you’ll find a clear guide: which ones you should limit and which ones you should incorporate more frequently if you’re looking to protect your brain in the long term.

Nuts that can DAMAGE your brain

1. Peanuts (when not properly stored)

Improperly stored peanuts can develop aflatoxins, toxins produced by fungi that directly affect brain and liver cells. Although not all peanuts are affected, they are one of the nuts most sensitive to humidity and heat.

Risk: inflammation, cell damage, and concentration problems.

2. Overly Salted Pistachios

Natural pistachios are healthy, but the most commonly consumed are roasted pistachios with high amounts of salt. Excess sodium increases blood pressure, which impairs cerebral circulation.

Risk: reduced brain oxygenation, dizziness, and mental fatigue.

3. Cashews (when highly processed or fried)

Commercially processed cashews are often fried in low-quality oils. This increases their content of oxidized fats, which promote systemic inflammation.

Risk: inflammatory processes that affect cognitive function.

4. Brazil Nuts in Excessive Quantities