1- Rhubarb
The dangerous part is the leaves of the rhubarb plant, which contain oxalates or oxalic acid.
2- Potatoes
The lethal poisons associated with potatoes actually reside in the stems, leaves and sprouts but can build up within the part of the potato we eat if left around (especially in the light) for too long.
3- Almonds
If your almonds taste bitter stop eating them! They contain relatively large amounts of hydrogen cyanide, a deadly poison.
4- Fast Food
No need to explain…
5- Leafy Greens
Such food poisoning staples as E. coli, salmonella and even Norovirus were found to be the root causes of leafy green-related illnesses.
6- Dairy (chiefly eggs, milk and ice cream)
In order for their milk to pass inspection, the melamine was added to a wide range of products (including baby milk) so as to make them appear to have a higher protein content.
7- Water
Water intoxication is essentially death by drinking too much water.
8- Ackee Fruit
Picking the ackee fruit before the time is right can lead to what’s known as Jamaican vomiting sickness.
9- Namibian Bullfrog
Frogs can contain a deadly poison that can cause kidney failure (known locally as Oshiketakata) and - in more extreme cases - death.
10-Cassava
If not properly prepared before consumption (or eaten raw), then it turns into wondrous hydrogen cyanide, which is quite poisonous and will kill you.
According to Tripbase