A vegan diet, which cuts out all foods derived from living creatures -- including eggs, dairy products, gelatin and honey -- can send you on a steep learning curve. Even the more lenient parameters of a vegetarian diet take care and planning to be healthful and well-balanced. When following a vegetarian diet, your daughter will no longer eat red meat, poultry, fish or other seafood. Although it can be tempting to dive into the deep end with a new lifestyle choice, we suggest a gradual transition. A few good vegetarian cookbooks will be essential tools for coming up with varied and healthful meals and snacks.