Some foods can become dangerous if left overnight due to bacterial growth or chemical changes. “Health risks can significantly increase if they are not adequately refrigerated or reheated,” the article warns.

**1. Mushrooms & Wood Ear Fungus**
These should be eaten fresh. “Complex proteins and high nitrate levels… can decompose into toxic compounds” if stored too long. Reheating can also cause stomach issues.

**2. Leafy Greens (e.g., Spinach)**
Rich in nitrates, greens lose nutrients and develop harmful nitrites when left at room temperature. “They become less healthful and maybe dangerous” without proper storage.

**3. Soy-Based Foods (Tofu, Soy Milk)**
With high protein and moisture, these are prone to bacteria. Improper storage may lead to contamination with *Clostridium botulinum*, which can cause nerve damage or death.

**4. Shellfish & Soft-Boiled Eggs**
These spoil quickly and may accumulate toxins. They are “high-risk items that should not be stored overnight.”

**5. Safe Storage Tips**
Use sealed containers, refrigerate below 4°C (39°F), and don’t store for more than 24 hours. Avoid reheating leftovers multiple times, as it “can compromise nutritional quality and safety.”