[jniedrauer]

Calcium is most certainly an issue. A lot of vegan dairy substitutes are already fortified with calcium for this specific reason.

I'm still learning this stuff myself. But from the things I've read so far, vegans (especially the WFPB variety) can have difficulty getting: Vitamin B12, calcium[0], iron, and possibly a balanced amino acid profile if they have elevated protein requirements. A diet too high in carbs and too low in fat and protein can also cause long term problems like candida overgrowth and hormonal imbalances.

[0]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3967195/