Zucchini, also called courgette, is a highly revered summer squash. It is a good source of vitamins, minerals and fibre, making it the star of side dishes and salads. There are various research that testify to its nutritional value. A study published in Nutrients in 2017, stated that zucchini could play a positive role in human health and nutrition due to this fruit and its components were safe. They were also able to inhibit significantly the H2O2-induced damage and exhibit anti-proliferative and pro-apoptotic activities toward HL60 (human promyelocytic leukaemia cells) tumour cells. Moreover, zucchini's mild flavour pairs well with a wide variety of recipes. Zucchini Poisoning A 2024 study published in the Polish Archives of Internal Medicine highlighted such a case. It involved a 54-year-old relatively healthy woman who ended up in a Czech Republic emergency department with severe abdominal pain accompanied by vomiting and bloody, watery diarrhoea. The next day, doctors found she had liver damage. Puzzled by why an otherwise healthy patient would develop such intense, sudden symptoms, the medical team tried to pinpoint a cause. Then it was discovered that the patient had consumed unusually bitter zucchini bread before developing symptoms. Doctors eventually diagnosed her with cucurbitacin poisoning, caused by toxic compounds that can form in zucchini and other plants in the Cucurbita family."Cucurbitacin poisoning occurs when these compounds disrupt cellular processes, causing tissue irritation, particularly in the gastrointestinal tract," Babeta Čápková, MD, case study co-author and a general medicine physician in the department of Internal Medicine at Tomas Bata Hospital Zlinin in the Czech Republic. "A bitter taste is indeed a hallmark of high cucurbitacin concentrations and often the only immediate indicator."What Are Cucurbitacins?Cucurbitacins are naturally occurring organic compounds known as tetracyclic terpenes. These compounds, primarily found in cucurbits—such as cucumbers, squash, melons, and gourds—serve as a natural defence mechanism against herbivores. While cucurbitacins have been studied for their pharmacological benefits, including anti-inflammatory and anti-cancer properties, they can also be toxic when consumed in high amounts.Why Do Vegetables Contain Cucurbitacins?Plants may produce cucurbitacins as a response to environmental stressors, such as drought or suboptimal growing conditions. These compounds are responsible for the bitter taste in certain vegetables, signaling potential toxicity. If a cucumber or zucchini tastes unusually bitter, it could contain elevated levels of cucurbitacins and may pose a health risk.Symptoms of Cucurbitacin PoisoningCucurbitacin poisoning, sometimes referred to as “toxic squash syndrome,” can cause gastrointestinal distress, including nausea, vomiting, diarrhoea, and abdominal cramps. In severe cases, symptoms may escalate to hypotension (low blood pressure) and intestinal swelling. Symptoms typically appear within minutes to hours after consumption, even in small amounts.A recent case study in the Netherlands highlighted the dangers of cucurbitacin toxicity when a couple became severely ill after consuming homegrown bitter zucchini. While one person recovered, the other tragically succumbed to the poisoning within 24 hours. Diagnosing cucurbitacin poisoning can be difficult due to its rarity and the absence of a specific lab test. Symptoms often resemble acute gastric illnesses, making an accurate patient history crucial. Should You Avoid Zucchini and Other Cucurbits?Despite the risks, there is no need to eliminate cucurbits from your diet. The health benefits of these vegetables far outweigh the potential dangers. However, experts advise tasting a small portion of raw zucchini, squash, or cucumber before cooking. If it tastes excessively bitter, discard it immediately.