No, being vegan cannot cause depression.
Being vegan itself probably doesn't cause depression. However, some people might grow to have nutritional deficiencies when sticking to a vegan diet, and these may result in some depression symptoms. If vegans aren't being extremely diligent about where they get their nutrients from, they can often have low levels of omega 3s, amino acids (protein), vitamin b (especially b12) and iron.
If you have been a vegan for may years or are considering a vegan diet, it would behoove you to work with a holistic nutritionist (or any nutritionist who has experience in consulting people eating vegan diets) to make sure you have adequate levels of all the aforementioned nutrients!
Long term veganism will almost definitely cause depression as a result of a lack of Tryptophan in the diet. Tryptophan is an amino acid found only in animal protein, and is the precursor to the neurotransmitter Seratonin. Seritonin is directly responsible for happiness. To learn more about the depression-diet link, I recommend checking out Dr. Emily Deans' blog at _ http://evolutionarypsychiatry.blogspot.com/.
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