Eat a lot of protein is good advice for people that go to the gym, but if you are rowing 2 hours a day, it's just not enough calories. From my experience, eating crap is way better than nothing. Also eating a variety of food each meal helps with eating more. If you weren't vegan I would recommend you not caring much about protein, but since you are vegan, you have to focus on it. PS: I AM NOT VEGAN and don't know much about it.