Any type of contaminated food could be life-threatening. Still, several foods worldwide require extreme care and precision during preparation to avoid causing severe illness or death.
You’ve probably heard of fugu, the Japanese delicacy that must be prepared exactly right if you don’t want customers to asphyxiate in your dining room, but there are more than a few foods that can kill when not prepared correctly.
Some of these foods are exotic delicacies that can be hard to find in Canada, while others are common staples in your pantry or dry goods storage. From fugu to kidney beans, here are eight of the world’s most dangerous foods.
1. Fugu
Fugu is the Japanese word for pufferfish, and the dish prepared from it can be lethally poisonous. The fugu's ovaries, intestines, and liver contain tetrodotoxin, a neurotoxin up to 1,200 times more deadly than cyanide.
A lethal dose of tetrodotoxin is smaller than the head of a pin, and a single fish has enough poison to kill 30 people. If prepared incorrectly, fugu can paralyze motor nerves and cause fatal respiratory arrest.
Japanese chefs must undergo years of training to obtain a fugu-preparing license; despite these precautions, numerous people die from improperly prepared fugu every year.
2. Ackee fruit
Ackee, the national fruit of Jamaica, is a delicious but dangerous treat. Unripe ackee contains a hypoglycin poison, so the fruit must be fully ripe and allowed to open naturally on the tree to be safely eaten.
Seams on the outside of the fruit will split wide open when the fruit is ready to be picked.
Never open an ackee fruit yourself (it must open on its own) and only eat the cream-colored, fleshy pulp around the seeds. Do not eat any of the pink flesh or the black seeds because they are highly toxic.
Improper preparation of ackee fruit can cause serious illness (dubbed the ‘Jamaican Vomiting Sickness’), leading to coma or death.
3. Sannakji
Sannakji, a Korean dish, is live baby octopus tentacles cut into pieces, seasoned, and served immediately.
Culinary daredevils eat the tentacles while still writhing on the plate, which is a perilous game.
Suction pads on the tentacles maintain suction even after the tentacles are severed, so diners must chew the tentacles before they stick to the roof of the mouth.
If they don’t, the tentacles can stick to the mouth and throat and cause the customer to choke to death. According to Food & Wine, six people choke and die from eating (or attempting to eat) sannakji each year.
4. Hákarl
Hákarl, a traditional Icelandic dish, is Greenland shark meat that is cured and hung to dry for three and five months. This process is necessary to neutralize the high urea and trimethylamine oxide levels in the shark’s flesh.
Greenland sharks don’t have a urinary tract, so waste and toxins are filtered through their skin and flesh.
For the shark, this mixture of compounds acts as a natural antifreeze that protects it from the frigid arctic waters. Still, the chemicals are so concentrated that just a few bites of uncured fresh meat are enough to cause symptoms of extreme intoxication in people.
Intestinal distress, neurological effects, convulsions, and even death can occur if eaten in large enough quantities.
5. Cassava
Cassava, a tropical root crop similar to taro and yam, is often used to make pudding (‘tapioca’), juice, cakes, and chips, but its leaves and roots can produce deadly cyanide. To prevent poisoning, cassava must be properly cooked before canning, eating, or serving.
Cassava is classified into two main types: sweet and bitter. Sweet cassava, which contains low levels of cyanogenic glycosides (50mg/kg), only requires cooking to reduce the cyanide content to non-toxic levels. Still, bitter cassava contains more toxins and must be grated, soaked, and cooked properly before consumption.
The Canadian Food Inspection Agency (CFIA) has provided these guidelines for preparing cassava safely.
6. Rhubarb
Rhubarb, the bright vegetable often found in jams and pies, has a dark side. Its leaves, which should not be used in baking or cooking, contain oxalic acid.
Consuming too much oxalic acid can be fatal, though you would have to eat large quantities of rhubarb leaves (approximately 11 pounds) to die from it.
However, consuming small amounts of improperly prepared foods can cause several uncomfortable symptoms, such as a burning sensation in the mouth and throat, nausea, diarrhea, eye pain, difficulty breathing, and red urine.
Oxalic acid can also cause kidney stones — which are hard deposits of minerals and acid salts that stick together in concentrated urine — which are known for causing severe pain, cloudy, red, or foul-smelling urine, fever, and chills.
7. Elderberries
Elderberries, native to Canada and commonly used in jams, pies, wines, teas, syrups, and supplements, are safe to eat if they are fully ripe and properly cooked.
However, elderberry leaves, twigs, and seeds contain potentially fatal levels of cyanide-producing glycoside (‘cyanogenic glycoside’). If elderberries aren’t fully ripe or strained properly when processed, they can cause nausea, vomiting, and severe diarrhea.
If consumed in large quantities, glycoside may cause seizures, coma, or even death; you would have to drink up to five glasses to be in life-threatening danger, but just a cup of improperly prepared elderberry products could cause serious illness.
8. Red kidney beans
Red kidney beans are rich in plant-based protein, fiber, and essential vitamins and minerals; in their raw or undercooked form, they are also rich in phytohaemagglutinin, a toxic variety of lectin.
Phytohaemagglutinin can damage the gut wall and may prevent it from absorbing nutrients properly. Symptoms of poisoning may include diarrhea, abdominal pain, vomiting, and headaches.
To be safe, dry red kidney beans must be prepared just right — which involves soaking for several hours and boiling for at least 10 minutes.
In fact, according to the U.S. Food and Drug Administration (FDA), cooking dried red kidney beans for less than 10 minutes at any temperature less than boiling can actually increase the toxicity five-fold, so beans are more toxic than if they were consumed raw.
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