Cucumbers have long been considered a refreshing, crisp, sweet, and affordable vegetable that helps cool the body.
However, consumers occasionally encounter bitter-tasting fruits, and many still maintain the habit of discarding the stem end or continuing to eat the rest, thinking that "the bitterness is due to the variety."
The bitter taste in cucumbers
Cucumbers have long been considered a refreshing, crisp, sweet, and affordable vegetable that helps cool the body (Photo: Getty).
According to botanical studies, the bitterness in cucumbers comes from cucurbitacin – a group of triterpenoid compounds produced by cucurbitaceae plants (including cucumbers, pumpkins, gourds, bitter melons, etc.) to defend themselves against insects, pests, and adverse environmental conditions.
Normally, the cucurbitacin content in ripe fruit is very low, not enough to be detected by taste. However, when the plant is subjected to growth stress such as high temperatures, drought, intense sunlight, poor soil quality, or the use of unstable varieties, the synthesis of cucurbitacin can increase sharply.
At this stage, the compound spreads from the leaves and stems into the fruit, particularly accumulating at the base of the stalk or flower head, creating a distinctly bitter taste.
An analysis in the Journal of Agricultural and Food Chemistry showed that when cucurbitacin concentrations exceed 30 ppm, some people may experience gastrointestinal symptoms as early as 30 minutes: nausea, abdominal pain, and vomiting.
At higher levels, this compound can be toxic to the liver and kidneys. Cucurbitacin is also heat-stable and does not break down when boiled, baked, fried, or pickled. Therefore, if the original ingredient is bitter, no processing method will completely eliminate the risk.
Lessons from cucurbitacin poisoning cases
Cucurbitacin poisoning has been reported in many countries through cases of people eating bitter-tasting pumpkins and zucchini.
In the Czech Republic in 2024, a healthy woman experienced severe abdominal pain, vomiting, and diarrhea after eating bread made from homegrown zucchini, which was very bitter.
Tests confirmed the cause was cucurbitacin. Dr. Babeta Čápková (Tomas Bata Hospital) stated that the bitter taste was the only warning sign of dangerously high levels of the compound.
Although poisoning is rare, severe cases can lead to low blood pressure, dehydration, and other complications.
In 2018 in France, two women experienced vomiting and diarrhea after eating bitter-tasting pumpkin soup. A few weeks later, they developed hair loss – a rare but thought-provoking symptom linked to the toxicity of cucurbitacin.
Health experts warn that while "toxic squash syndrome" is rare, it can absolutely occur if consumers disregard the bitter taste.
How to identify them and expert advice.
According to Veronica Tegen, a board member of Midwest Fruit Explorers, the safest way to deal with bitter cucumbers is to discard them entirely, even if you only taste a slight bitterness. Simply cutting off the ends is not safe because cucurbitacin may not be evenly distributed throughout the fruit.
To minimize risks, Ms. Tegen recommends choosing less bitter melon varieties and ensuring cool, well-watered growing conditions, avoiding periods of intense heat or prolonged drought.
Additionally, some folk remedies, such as rubbing the cut end against the body to create a white foam – where cucurbitacin is concentrated – may help reduce bitterness but do not completely eliminate the risk in fruits with high levels of the compound.
Observing the appearance is also helpful: good quality fruit usually has a moderately dark green color, a smooth, glossy skin, soft, sparse spines, and a slightly natural curve, while fruit that is prone to bitterness may be dark in color, wrinkled, and lacking in moisture.
Source: https://dantri.com.vn/khoa-hoc/dua-chuot-bi-dang-an-hay-bo-20250815082814124.htm
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