3. Pine nuts—risky if you’re unlucky

If you’ve ever eaten pesto and noticed a weird metallic or bitter taste in your mouth even for days after, that’s called pine mouth. It can happen if you get pine nuts from certain specials, like the ones that aren’t carefully processed. They are harmless but really annoying.

Make sure you stick with reputable brands and trusted sources if you decide to go for pine nuts, and you should be fine. They are amazing for their composition, such as zinc, magnesium, and taste, but just don’t gamble.