Hello there and thank you for your question!
Color additives or food colorings are safe to eat when they are in accordance with FDA regulations. The FDA has a great questions and answers page that can probably answer your question better than I can.
Nutritionally, when it comes to eating foods with food colorings, the best way is to go with foods that are whole foods and minimally processed like the recipes on EatFresh.org! By eating whole foods, you are using those precious calories on foods that are nutritionally dense and delicious!