So from that perspective alone it is important to include animal based sources of omega - 3 fats. (articles.mercola.com)
Our analysis of the ingredients show that this product derives most of its protein from animal based sources. (pawdiet.com)
Vegans also claim that getting vitamin D from the sun or mushrooms is all that is necessary, but during winter months, it is crucial to be consuming animal based sources of vitamin D, else one is a sitting duck for flu and other wintertime illnesses. (thehealthyhomeeconomist.com)