I'm a vegetarian, so that means i don't eat any eggs, fish or meat. is there a way to gain a few pounds, even if i have a high metabolism? if so, how?

Tried milkshakes?: A rule of thumb--to gain 1 pound eat 3000 calories more than your body normally burns. A bigger question is why are you having difficulty gaining weight? Have you explored with your doctor the possibility of undernutrition, hyperthyroidism, malabsorption and maldigestion, infection, altered GI tract function, eating disorders, inflammatory conditions, and malignancy? Pursue evaluation please.