I was a vegan for 2 years in the past. First year I also didn’t have any deficiencies. But then it all caught up and ruined my health after two years. Low iron, low B12, constant fatigue, low libido (in 20s), muscle mass loss (people who haven’t seen me for a while thought I was either sick or on heavy drugs), no drive, bloating, constant gas (has to take anti gas pills), constant canker sores (turned out b12 related), etc.