Protein is one of the most important nutrients needed by the body for the growth and maintenance. Proteins are large molecules made up from 20 different essential and non-essential amino acids. There are many sources of protein but all are not beneficial for health. Some of high protein sources are very bad for health as they are also high in saturated fats and carbohydrates so always choose the right protein foods. Protein, saturated fats and carbohydrates together can cause many health problems when consumed daily. Here are given some of the worst protein sources that you should eat with caution as they are bad for health and environment.