Mr. Li’s daily eating habits play a crucial role in his health. As the primary provider for his family, he often works long hours and frequently returns home late at night, exhausted and hungry. To save time, he purchases a large quantity of food on weekends, storing everything in the refrigerator and relying on these supplies for the following days.

Inside Mr. Li’s fridge, one can find vegetables, fruits, meat, and even leftovers. However, few realize that this seemingly convenient approach to meal planning can pose serious health risks.

Doctors warn that while refrigerators help extend the shelf life of food, they do not guarantee safety in all cases.

Here are five types of food that should not be stored in the refrigerator for extended periods, as they can become breeding grounds for harmful toxins and even contribute to cancer risk.

1. Green leafy vegetables

Leafy greens like spinach, cabbage, and lettuce naturally contain nitrates. When stored in the refrigerator for too long, these nitrates can transform into nitrites, which are associated with an increased cancer risk.

This is especially concerning for sautéed or fried green leafy vegetables that contain high amounts of oil. Studies show that their nitrite levels can rise significantly after being kept in the fridge for just 16 hours.

2. Repeatedly thawed meat

Repeatedly freezing and thawing meat leads to bacterial growth and the accumulation of harmful substances, including carcinogens like P-ammonium dinitrate. Each freeze-thaw cycle increases the concentration of these compounds, raising potential health risks.