Rice
This food may contain a small amount of arsenic. Natural arsenic is often found in soil and water, it is absorbed by rice, fruits, vegetables and grains during cultivation. Although the amount of arsenic contained in a portion of rice does not cause great harm. However, the consumption of arsenic is likely to increase the risk of certain diseases, including cancer.
Mushroom
Most people do not know the different types of fungi, especially wild mushrooms. Even experts can confuse edible mushrooms with wild mushrooms for being lethal. So it's best to buy mushrooms in reliable places with warranty. Poisonous mushrooms contain toxins like orellanine, gyromitrin and alpha-amanitin, if you eat poisonous mushrooms, or not cooked yet, you can die of liver failure.
Tomato
Tomatoes are a sweet and flavorful fruit, containing many beneficial vitamins and nutrients, but their leaves are toxic to humans. They contain small amounts of solanine, toxic alkali. Accidentally ingesting 1-2 small leaves in a tomato salad will not be harmful, but eating large amounts - such as using them as a vegetable in a salad - can be dangerous.
Potato
Potatoes with a blue crust will have mild toxicity. This green color is caused by a substance called solanine, which appears in potatoes as they age and begin to germinate. Most people can tolerate solanine in small amounts, such as in 1-2 green potatoes. Consuming a large amount of solanine can be fatal
Cassava root
Cassava is very popular and is a staple food in tropical countries. It is also called yuca, manioc, or Brazilroot. Cassava is cooked very well, but cassava contains many different types of cyanide. If it is improperly prepared, it is quite toxic.
Puffer fish
Pufferfish is a delicacy in Japan and fans think it is the best dish of all fish. The liver, ovary and skin of puffer fish contain tetrodotoxin. If the fish is not properly prepared, the fish is quite toxic, and can be fatal.