Milk is the main food source of calcium in the diet of Americans. Adding an 8-ounce glass of low-fat or non-fat milk to breakfast is a simple way to start your day right and help get the necessary intake of milk (and calcium) of the day.
Although calcium can be obtained from non-dairy sources of calcium, it may be more difficult to obtain the required amount of calcium without milk or dairy products in the diet.
Because the words that come out of your mouth pretty much say everything about you, and to use personal communication in a professional enviroment would make you look unprofessional.