Now to be fair, we don't know how vegan diets go. Everybody is different and has made their dietary choices for personal reasons.
However, as with any lifestyle choice, it takes a lot of research and specific planning to make sure that nothing falls through the cracks.
People switching to vegan diets have often reported symptoms related to the lack of nutrients their body is used to acquiring from animal products. Such symptoms include hair loss, jaundice, osteoporosis, and anemia.
Still, we understand that having somebody generalize your personal lifestyle choice can be incredibly infuriating.
So, there are facts and opinions for and against either side.