I had a vegan friend who ate nothing but rice, beans and tofu. She ended up overweight, with protein and iron deficiencies (as told to her by a doctor, who tested her blood and urine when she complained about constant fatigue).
Told her to eat horse, bison, chicken, fish and beef. Energy is coming back, and she feels 100x better, with special focus on the red meats.
Protein is not protein. I wish this were as anecdotal as it sounds, but I went through this cycle more than once with vegetarian/vegan friends.