Can Being Vegan Cause Fainting?


This isn’t a topic that is studied a lot.

It’s typically a symptom of some condition or disease.

I’ve come across some anecdotes of why people were fainting (or feeling like they were about to) as vegans, and I’ll summarize them for you.

However, this is not medical advice, and fainting is a serious enough symptom that you should go see a doctor for it.

Causes of Fainting

Let’s take a quick look at common causes of fainting for vegans:

  • Low blood pressure – Many vegans do have low blood pressure. If it gets low enough, fainting is possible. This could be caused by dehydration or a lack of salt, or by a serious underlying condition like heart problems.
  • Not eating enough – If you’re feeling weak, particularly as a new vegan, there’s a good chance you’re lacking calories. Focus on more calorie dense foods like nuts, and a bit less on vegetables.
  • Sick – If you have other symptoms, you may have caught a cold or a flu.
  • Vitamin B12 deficiency – Fainting isn’t a common symptom of a B12 deficiency, but it is possible. A doctor can easily check your blood levels.

There’s a chance that your fainting is caused by one of the above relating to diet, but the more likely explanation is that you have some underlying condition that’s unrelated to being vegan.

That’s why it’s crucial that you see a doctor if you faint, or even if you have a feeling of fainting on a regular basis.

About the author

Dale Cudmore

Your friendly neighborhood vegan from Toronto. Chemical engineer turned semi-professional soccer player and freelance nutrition writer. I've been vegan for years and try to make life easier for others by sharing what I've learned.

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