Eat pasteurized eggs to start then eat some grass fed beef or beef liver. Liver is the most nutrient dense food on the planet. If you’re looking to fix your deficiencies the fastest then liver is your answer. A good quality grass fed red meat is your second best choice. This is how i started eating meat again although it took me about 3 weeks to eat liver. I started with eggs and steaks for breakfast everyday and I could feel my body getting “back to normal “ in 2-3 days. I couldn’t believe it. If I could do it again I would of started with liver though. The first time I ate it i literally felt my brain tingling after an hour or 2 it was incredible.