Another factor sometimes discussed is chlorfenuron, a plant growth regulator used in some regions to speed up fruit development by stimulating cell division. This accelerated growth can occasionally lead to hollow centers or irregular flesh patterns. However, its use is strictly regulated in many places. Some countries restrict or ban it on food crops due to limited long-term data, while others permit controlled application under safety guidelines.
Scientific research on chlorfenuron’s effects on humans is still not fully conclusive. While high-dose animal studies have shown negative effects, there is no clear evidence linking normal dietary exposure to serious health problems in people. Because of this uncertainty, regulators often take a cautious approach, prioritizing consumer safety when data is incomplete.
When choosing a watermelon, simple physical checks are still the most reliable guide. A good fruit should feel heavy for its size, have a creamy yellow ground spot, and a firm, intact rind. A dry stem often indicates proper vine ripening. After cutting, quality is judged by smell and texture—fresh watermelon should smell sweet and clean, with a crisp bite rather than a fermented or off odor.
If a watermelon shows minor internal cracking but otherwise appears normal, it is generally considered safe to eat. However, fruit with strong odors, slime, mold, or strange flavors should be discarded immediately, as spoilage is a more realistic health risk than trace growth regulators within regulated limits.
