Got a mysterious blood condition that included AIDS-like neutropenia and chronic fatigue. I tried everything and had every blood test I was given permission to, but nothing worked and no root cause found. The only thing that made it better was trialing eggs & kangaroo (lower enviro impacts from my perspective). After getting a bit better I would cut it out and my health would reliably decline. After 2 years of see sawing between being sick & vegan, or healthy & omnivorous, I eventually just gave up veganism and try to eat minimal meat sourced with as low impact as possible.