Previous research on the health effects of travel have concentrated on negative effects such as deep-vein thrombosis, economy-class syndrome and tropical diseases. However, a study of 40 Japanese women on a short package holiday has found more positive results from travel. Nobly agreeing to go on a free holiday with forty women, researchers tested the women's saliva throughout the trip for levels of a substance called chromogranin A (CgA). The higher the levels of the substance the better and, as the trip went on, the women's CgA levels increased. The effect was more pronounced in women who led a healthier lifestyle before the start of the trip.
Toda, Masahiro ... [et al] - Health-related lifestyle and patterns of behavior related to health effects of leisure travel Social Behavior and Personality 2007, 35(3), 287-293