In order to have a good health, there are many ways. First, sleep and nutritional considerations are help to prevent the onset of a cold or flu, a healthy lifestyle helps your immune system to be in its best possible shape, giving you the best chance of being able to fight off the onset of a cold or flu. Next, do exercise regularly because it has enhancing immune-system that can help ward off illness. Finally, eat more fruits to get vitamin C that might prevent the common cold. Furthermore, you had better drink more milk, this will be help you healthy and stronger to prevent the cold