Artex said:
I always thought a vegetarian diet was a major obstacle to athletics or being very active. I still think so, but the world's best ultramarathoner (arguable),
Scott Jurek, is a vegan. I could never go full vegetarian as I like steak too much and also enjoy hunting, but pretty cool that a top athlete is vegan and shows its more than possible. To each their own.
lots of top athletes are, especially in weight class sports, and those not focused on bulk (no vegetarians in the NFL), Chris Campbell won gold in Freestyle wrestling, and is by far the most muscaler human being I have ever met in person.
As I gradually move towards vegetarianism (gave up beef and pork three years ago, now have chicken monthly, fish couple times a week), and found that working out and hiking is getting progressiviely easier, and my weight and percent body fat are steadily dropping - if only I made the change during my college or high school days when I actually competed...
They make some good dehydrated meals that are meatless, most rice/pasta based, which are awesome for backpacking. I did four days on the Long Trail last week with no meat for four days, it was great. In addition to those puch meals, I had hummus sandwhiches, peanut butter and jelly sandwiches, dried and packaged fruit, oatmeal, various granola and supplement bars.
One thing I would avoid is cheese on the trail, as dairy contains lactic acid, which can cause fatigue, so mid-excercise it is not good to have a lot of.
You need an answer that is "just about" for those of us who eat meat here and there.