Back in 1997 I was inspired by Shaolin monks who ate simple vegan meals. I worked in a Jeep warehouse shipping parts to assembly plants, so lifted heavy stock all the time. I went vegan but in 2 weeks it was painful to lift moderately light stock, so went back to meat and returned to my normal.
So I was a bit apprehensive about doing a 30 day vegan challenge whilst working as a general labourer for a builder. Stayed with it for 6 months or so, retired and worked out with weights, I hit a point where my strength went. I added some fish at first and started to regain strength.
I had read much about vegan bodybuilding and bought books, even several seminars. After fish came eggs the meat, not in huge quantities but mostly when eating out, and this was gradual.
Nowadays it's mixed feelings, when working out I have strong urges for protein in the form of meat, but in a Yoga cycle I eat light. I don't do both at the same time, but have done Yoga almost daily for 2 months then workout for 2, now trying to balance both but it's hard because you get sore and stiff from the weights.
It's like two versions of me trying to gain control, like my yang side and then the yin. yang wants to be more masculine, and yin more soft.