Hi Jo! Welcome to TE!

When my husband was cycling competetively and training to try to make the Olympic team in 1996, his coach and a lot of reading helped him with diet. He thinks you should definitely replenish protein after every endurance workout. In fact, he said that if you eat some protein at that time after your workout, it will facilitate the fat buning process while you sleep, as well and help your muscles rebuild.

Hope that helps!!! I know there are a lot of books out there about eating to train.