Unfortunately, due to the highly restrictive nature of the diet, vegans are at risk of being deficient in certain nutrients such as calcium and vitamin B12 usually found in dairy and meat respectively.

As you read along, you'll find out that most health conditions developed by vegans are related to vitamin B12 deficiency. Without the familiar sources of vitamin B12, certain bodily functions can be disrupted, leading to anemia, gastritis, stroke, Crohn's disease, and Celiac disease.

It's easy to talk about how humans need to eat meat and dairy to thrive — how animal-based foods contain essential nutrients not found in plants and how being vegan can lead to all kinds of vitamin and mineral deficiencies.