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.