Eating bad zucchini can lead to a variety of unpleasant side effects. Depending on the level of spoilage, you may experience nausea, vomiting, abdominal pain, and diarrhea. Eating spoiled zucchini can also cause food poisoning, which is an infection caused by consuming food or drink contaminated with bacteria or other toxins. Symptoms of food poisoning include fever, chills, headache, muscle aches, and fatigue. In some cases, eating spoiled zucchini can be dangerous. If the zucchini has been left out at room temperature for too long and it has become moldy or slimy, there is a risk of consuming harmful bacteria like E. coli or salmonella. These bacteria can cause serious illnesses such as kidney failure and blood infections. If you experience any severe symptoms after eating bad zucchini, it’s important to seek medical attention right away.