In autumn, many people pick ginkgo nuts from streets to eat. However, experts warn that this practice carries health risks. Touching the outer skin of ginkgo nuts can cause skin allergies. The skin contains substances that may lead to rashes, itching, or swelling. If symptoms appear, wash the area with cool water for 10 to 15 minutes. Do not use hot water, as it may spread the toxins. Seek medical help if blisters or severe pain occur. Ginkgo nuts also contain toxins inside. These toxins are heat-resistant and cannot be fully removed by cooking. Eating too many nuts can cause poisoning. Symptoms include vomiting, diarrhea, and nervous system problems. Children under five should avoid eating them, as even a small amount can be dangerous. Adults should limit their intake strictly. The bad smell of fallen ginkgo nuts comes from acids in the outer skin. This smell helps protect the seeds from being eaten by animals before they are ready.