Blue food can reduce the appetite, when there is a decrease in appetite should be timely medical care, to clarify the specific cause of the disease. The physiological structure of the human body has special characteristics, in different wavelengths of light, the blue light band of the wave spectrum is the most likely to activate the eye’s black visual protein photoreceptor system. The general blue wave spectrum will awaken the cerebral cortex to wake up, thus suppressing the appetite. In addition to blue food will reduce appetite, excessive tension, anxiety, late night, liver function damage, stomach lesions and other factors will also affect the appetite, can be adjusted by adjusting the daily routine, keep a light diet, avoid excessive tension to improve appetite, if the disease factors caused by the need to immediately go to the hospital for targeted treatment. If the above methods are not effective or accompanied by other uncomfortable symptoms, it is recommended to go to the hospital immediately for a clear diagnosis.