Natural-born killers: The fruits and veggies that could poison you

Story highlights

Lychees are thought to have caused a mysterious disease epidemic in India

Some crops contain neurotoxins that are harmful if eaten unripe and in large enough quantities

CNN  — 

Underneath its spiky exterior, the fruit is smooth, juicy and beautifully sweet.

The spikes of the lychee fruit – also known as litchi – may be a deterrent for some animals, but for humans willing to break it away, it’s an exotic and tasty treat. And often, just one is not enough.