What kind of bad things can happen to your body if you don't have a healthy vegetarian diet?

As opposed to?: I don't fully understand what you are asking. Do you mean a healthy vegetarian diet vs. An unhealthy vegetarian diet? Vs. A healthy non-vegetarian diet? While a healthy vegetarian diet tends to be good for most people, studies of cultures known for health and longevity conducted by weston price and others found these indigenous diets always included some meats (wild/organic). Please clarify.