The value of off-season fruit compared to in-season fruit lies in the novelty of eating it fresh, not in its nutritional value. Those colorful and enticing off-season fruits are often grown in greenhouses, where they lack the proper sunlight, wind, and soil conditions of in-season fruit. Therefore, the most nutritious fruits are often the cheapest varieties, and the cheapest fruits are typically in-season ones.
Fruit is best bought in small quantities as each type has its own optimal storage temperature and shelf life. The longer fruit is stored, the more its nutrients and flavor deteriorate. Most fruits should be stored in the refrigerator without washing to prevent spoilage and rot, and should be eaten within a week. However, fruits like bananas, pineapples, mangoes, papayas, and lemons should be stored in a cool, dark corner at room temperature and are not suitable for long-term refrigeration.
Additionally, some unscrupulous vendors use chemical ripening agents to sell off-season fruit, which can be harmful to human health. The following are listed as some of the most dangerous off-season fruits.
1. Grapes
Some unscrupulous vendors and growers use a ripening agent called ethephon. They dilute ethephon with water and soak unripe green grapes in the solution. After a day or two, the green grapes turn purple. Although this chemical has low toxicity, long-term consumption is harmful to human health.
2. Bananas
To make banana peels look attractively yellow, some unscrupulous vendors use sulfur dioxide to ripen them, but the flesh remains hard and not sweet at all. Sulfur dioxide and its derivatives are not only harmful to the human respiratory system but can also cause damage to the brain, liver, spleen, and kidneys, and even pose a risk to the reproductive system.
3. Watermelons
The excessive use of ripening agents, expanders, and highly toxic pesticides can render watermelons toxic. Such watermelons have uneven stripes on their rind, and when cut open, the flesh is exceptionally vibrant in color, yet the seeds are white, and an aftertaste is left in the mouth.
4. Strawberries
Large, irregularly-shaped strawberries with a hollow center are generally caused by an excessive amount of hormones. When ripening agents or other hormonal drugs are used, the strawberries' growth period is shortened, their color becomes more vibrant, but their flavor becomes dull. This type of strawberry must be consumed with caution. Eating large quantities can affect normal human development, such as causing premature puberty in children.