2- Vitamin B12 deficiency:

Vitamin B12 is one of the most vital vitamins in the body it is a major component in RBC build so people who have vitamin B12 deficiency usually suffer from precious anemia where their RBCs are bloated and not carrying oxygen properly but the problem with a vegetarian diet is that vitamin B 12 is mainly found in animal sources not as available in plants that’s why vegans must be very careful about learning all the possible sources of vitamin B 12 and try their best to incorporate them in all their meals for strict vegetarians fortified products are their best options for vitamin B12 supplementation like fortified rice, soy, oats, and cereals but for ovo vegetarians and Lacto vegetarians supplementation is way easier as eggs, milk and cheese are great sources of vitamin B12 where you can get most of the daily recommendations for vitamin B12 intake.
The recommended daily intake of vitamin B12 for adults is 2.4 micrograms, the requirements increase for pregnant women to about 2.8 micrograms.