Dr. Chiang notes that exercise can stimulate type 1 immune response, but city children these days rarely play outdoors. Most kids spend their free time playing with electronic toys or computers, which lowers their type 1 and raises their type 2 immunity.
江伯倫指出，運動會刺激第一型的免疫反應，但現代都市兒童較少從事室外運動，大多沈溺於電動玩具或電腦，導致第一型免疫力低落，第二型免疫升高。