The value of off-season fruit compared to in-season fruit lies in the novelty of eating it fresh, not its nutritional value. Those colorful, bright, and tempting off-season fruits are often grown in greenhouses, where their exposure to sunlight, wind, and soil conditions differ from in-season fruit. Therefore, the most nutritious fruits are often the cheapest varieties, and the cheapest fruits are typically in-season ones.
Fruit should be bought in quantities that can be consumed promptly, as each fruit 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, as washing can easily lead to spoilage and rot, and they should ideally be consumed within a week. However, fruits like bananas, pineapples, mangoes, papayas, and lemons should be stored in a cool, dark corner indoors and are not suitable for long-term refrigeration.
Furthermore, some unscrupulous merchants use chemical agents to ripen off-season fruit to boost sales, which can be harmful to human health. Below is a list of several dangerous off-season fruits.
1. Grapes
Some dishonest vendors and farmers use a ripening agent—etaphon. Users dilute etaphon with water in a specific ratio, immerse unripe green grapes in the solution, and 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 turn a bright, attractive yellow, some dishonest merchants use sulfur dioxide to ripen them. However, 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
Excessive use of ripening agents, expanders, and highly toxic pesticides can result in toxic watermelons. Such watermelons have uneven stripes on their rind, an unusually bright red flesh when cut, but white seeds, and leave a strange taste in the mouth after consumption.
4. Strawberries
Strawberries that are hollow in the center, abnormally large, and irregularly shaped are generally caused by excessive hormones. The use of ripening agents or other hormonal drugs shortens the growth period of strawberries, making their color more vibrant but their flavor weaker. This type of strawberry should be consumed with caution. Eating large quantities can affect normal human development, such as causing premature puberty in children.