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While most people obtain B-12 from meat, eggs, and dairy, excessive intake from food and supplements has no adverse effects in healthy individuals

As a primary mental disorder, it can also present with physical symptoms, including sleep problems, changes in appetite, weakness, and headache

mental and emotional factors play a significant role too

In fact, its thought that as many as 90% of the people who follow these diets are deficient in vitamin B-12 because one of the only natural sources for B-12 is in animal food products

However because vitamin B12 is primarily found in animal products such as milk, cheese, and eggs, vegans are at higher risk of having a vitamin B12 deficiency