Vegetarianism has many issues and levels. Most of my knowledge such as it is comes from older books that came out before I was born or at least fairly young. Diet For A Small Planet and Reecipes For A Small Planet for instance. They discuss food combining as a way to meet your protien needs. For instance, rice and beans so that the amino acid(s) that are lacking in one food make up with the other food.
There are environmental issues with taking the resources, the grain we feed the cows for example, that could feed us directly and more effectively.
Some vegans are hardcore and also will not wear animal products as well as not consume meat or meat byproducts. Some even go so far or so I've heard as to not eat foods that were cooked in the same pan that meat was cooked in.
I hope what I posted makes sense. A little tired so will edit if necessary.
There are environmental issues with taking the resources, the grain we feed the cows for example, that could feed us directly and more effectively.
Some vegans are hardcore and also will not wear animal products as well as not consume meat or meat byproducts. Some even go so far or so I've heard as to not eat foods that were cooked in the same pan that meat was cooked in.
I hope what I posted makes sense. A little tired so will edit if necessary.