Strawberries that are hollow, misshapen, irregularly formed, or excessively large are, with very few exceptions of high-yield new varieties, generally the result of excessive hormone use. After being treated with ripening agents or other hormonal drugs, strawberries have a shorter growth cycle and a brighter color, but their inherent fragrance is diluted and they lack fresh flavor when eaten. Sugarcane
The sugarcane available in the spring is mostly leftover from the autumn. After being stored for a whole winter, it is highly prone to spoilage, often developing a cotton-like or fluffy white substance at the ends. After cutting it, red, thread-like substances may also be seen on the cross-section. Some people fail to select sugarcane carefully, and when they see these red, thread-like substances after cutting, they mistakenly think it's normal, leading to sugarcane poisoning after consumption. Pineapple
Some people experience allergic reactions after eating pineapple, such as nausea, vomiting, abdominal pain, diarrhea, numbness of the lips, and itchy skin. This is because pineapples contain glucosides and bromelain. To prevent allergic reactions, cut pineapple should be soaked in light salt water for over ten minutes to destroy the bromelain before eating. Banana
In order to make banana skins turn a tender yellow and look more appealing, some unscrupulous merchants use excessive sulfur dioxide to ripen them. However, the flesh remains hard and not sweet at all. Sulfur dioxide is harmful to the human body. The correct method should be to ripen them with heat fumigation. Grape
Some unscrupulous merchants and growers dilute ripening agent ethylene with water, soak unripe green grapes in the solution, and after a day or two, the green grapes turn purple.