Hi noinnocentbystander! It's tough to answer as precisely as I'd like since I don't have your labs or medical history, but to give a general response, when people eliminate meat and dairy from their diet the nutrients with the highest risk for deficiency are iron, B12, and Calcium. Iron can be found in a lot of fruits and veggies, lentils, seeds, leafy greens, and quinoa! Some good sources of B12 are nutritional yeast, nori, and fortified soy or almond milk. Soy products (with minimal processing, ideally) are great plant-based sources of calcium (edamame, tofu, miso, soy milk, tempeh), as are nuts and seeds, and beans! If you're interested in supplementing instead, I always encourage consulting with your physician and having blood work done to see your nutrient levels before supplementing.