Three of my granddaughters had a year of being a vegetarian and then gave it up.
I tried vegetarianism for about three weeks. Was exhausted all the time. Went to nutritionist who did some tests said I was allergic to wheat and NEEDED red meat. Went out for rare roast beef dinner that night and never looked back. My local butcher has grass-fed beef from Oregon, $16/lb and worth it, and at least the cattle had happy lives.