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List Of Naturally Occurring Toxins In Food And How To Reduce Them
Many foods contain toxins as a natural-occurring chemical, including proteins, minerals, vitamins and carbohydrates. Some plant toxins are also formed as a result of processing or handling, however, the count is relatively low to not cause any serious adverse effects on humans.
Consumption of natural food toxins through plants or living organisms is unavoidable as we can't miss out on their vital phytochemicals, minerals and vitamins which our body requires for proper functioning and to prevent the risk of diseases.
In this article, we will discuss some of the naturally occurring toxins in food and how to reduce them. Take a look.
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What Are Natural Toxins?
Natural toxins are toxic compounds that are naturally found in living organisms. According to a study, everything has a bit of toxicity and it's the dose that separates the toxic from non-toxic. [1]
In a large amount (4-5 litres), water is also considered toxic if consumed in a short span of time, as it can lead to hyponatremia and cerebral oedema. According to the WHO, microscopic algae which are found in oceans and lakes also contain natural toxins, which are not harmful to aquatic creatures like fish that consume them, but could be harmful to humans upon consumption of those fish-containing toxins in a large amount.
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Likewise, almost all fruits, vegetables, nuts, seeds, seafood and fish contain some amount of toxic compounds, which can be dangerous when consumed excessively.
Also, the toxins which are naturally formed in plants and other living organisms are not actually harmful to themselves. This is because, in plants, the toxins are produced as a natural defence system against predators, microorganisms and insects, and in other organisms like fish, toxic substances act as their food. However, when consumed by humans or other organisms, they pose a risk of diseases.
Commonly Found Natural Toxins
1. Cyanogenic glycosides
According to a study, cyanogenic glycosides are reported in more than 2500 plant species. They are high in seedlings and young leaves compared to mature plants. They serve as a defence against herbivores, and humans can consume them with special modes of preparation to detoxify this plant. Some of the plants that contain glycosides include apple and pear seeds, the kernel of apricots, cassava, bamboo roots and almonds. [2]
It causes symptoms such as dizziness, stomach pain, gastrointestinal problems, cyanosis, brain fog, low blood pressure and headache.
2. Aquatic biotoxins
Aquatic biotoxins or marine biotoxins are mainly phytoplankton or harmful algae found in oceans. A study says that among thousands of microalgal species found in nature, around 300 are considered harmful and more than 100 contain natural toxins that can lead to the death of humans and animals. Shellfish such as oysters and mussels contain aquatic toxins as they feed on algae, and in some cases, the algal toxins are not eliminated even after cooking or freezing. [3]
Aquatic biotoxins cause symptoms such as vomiting, paralysis, diarrhoea and other gastrointestinal problems.
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3. Lectins
Lectins are carbohydrate binding proteins which are present in foods such as cereals, beans, potatoes, whole grains and nuts. Though they are a great source of fibre, proteins and vitamin B and are known to lower the risk of diabetes and heart diseases, they are toxic and inflammatory and resistant to cooking and digestive enzymes. [4]
Lectins are responsible for causing coeliac disease, rheumatoid arthritis and certain autoimmune diseases and problems related to small intestines.
4. Mercury
Some larger fish such as shark, swordfish and marlin contain mercury in a large amount. Eating these fish in large amounts can increase the risk of toxicity and cause conditions related to the central nervous system, lungs and kidneys. The FDA recommends pregnant, breastfeeding and children to not consume large fish.
Excess mercury in the body can cause dysfunction of membranes, enzymes and structural proteins and conditions like hypertension and tachycardia. [5]
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5. Furocoumarins
Furocoumarins are phytochemicals that have promising therapeutic properties like antioxidants, anticancer, antimicrobial, antidepressants and anticonvulsants. It also helps plants defend against insects and predators. Plants that contain furocoumarins include celery roots, lemon, grapefruit, bergamot, carrots and parsley. [6]
When consumed in a high amount, these plants can cause stomach problems and skin reactions.
6. Solanine and chaconine
Glycoalkaloids such as solanine and chaconine are naturally occurring toxins in plants that belong to the Solanaceae family. These toxins are mainly found in potatoes and tomatoes in small amounts, but can accumulate in high levels in stored, greened and damaged potatoes. [7]
A high concentration of solanine and chaconine can cause neurological and gastrointestinal problems.
7. Mycotoxins
Mycotoxins are toxic compounds produced by some kinds of fungi. The fungi that produce mycotoxins are of two categories: primary pathogens that affect people with normal immune systems and opportunistic pathogens that affect immunocompromised individuals. Fungi growth can occur especially during warm, humid and damp conditions where the food is stored or kept after harvest. [8]
Eating foods contaminated with fungi mycotoxins can cause cancer and immune deficiency.
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Other Naturally Occurring Toxins In Food
8.
Pyrrolizidine
alkaloids
(PA):
They
are
organic
compounds
found
in
approximately
6000
plant
species.
PA
is
detected
mainly
in
herbal
teas,
spices,
cereals
and
honey.
They
can
cause
damage
to
DNA
when
consumed
in
a
large
amount.
[9]
9.
Botulinum
toxin:
It
is
a
toxic
protein
released
by
the
bacterium
Clostridium
and
found
in
certain
foods
such
as
green
beans,
mushrooms,
beetroot
and
spinach.
[10]
10.
Hypoglycin:
It
is
an
amino
acid
found
in
the
unripened
fruit
of
the
Ackee
tree
and
seeds
of
the
box
elder
tree.
If
ingested,
the
toxin
can
lead
to
vomiting
and
diarrhoea.
11.
Coumarin:
It
is
an
aromatic
organic
chemical
found
in
foods
like
cinnamon,
tonka
beans,
green
tea
and
carrots.
Large
amounts
of
coumarin
can
cause
blurred
vision,
nausea
and
loss
of
appetite.
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How To Reduce The Health Risk From Natural Toxins?
- If toxins are present in the seeds, peels or shoots, it is better to remove the seeds, peel off the skin and boil the shoots in salted water to reduce the content of toxins.
- Consume bigger fish, especially the ocean fish in small portions. If you are pregnant, avoid consumption.
- Remove any green or damaged part of foods, especially potatoes.
- Soak foods like beans for at least five hours, followed by cooking to remove the toxin lectins.
- Throw away foods that are damaged, discoloured or have signs of fungus on them.
- Avoid using foods that taste bitter, smell bad and do not look fresh.
- For mushrooms, eat those that are identified as non-poisonous.
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To Conclude
Stay aware of the toxins found in plants, their doses and methods of preparation to reduce their toxicity. This may help you keep a safe level of natural toxins and get the benefits of other healthy compounds found in foods.
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