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Why do you need to supplement omega 3s, vitamin B and vitamin D? Oh right, because your diet is lacking.
Why do the farm animals raised for meat need to be feed b12 in order to be ready for slaughter?
Edit: Also why do Canadians need to supplement vitamin d. So your diet is pretty lacking too according to your own logic.
Vitamin D comes from the sun. Either sit in the sun enough, or eat other mammals that did.
Vitamin D supplementation is recommended for all Canadians, not just vegans. And Omega 3, D, and B12 are common supplement recommendations (actually backed by strong evidence) for the general population. (Although the benefits of Omega 3 supplementation for heart health has come under scrutiny, I think its anti-inflammatory effects are still pretty widely supported.)
Anyway, no need for the vitriol. Nobody is forcing you to go vegan. If it works for them, then great! It's definitely better for the planet to eat less meat, so power to them. (I eat way too many eggs to ever consider going vegan, personally.)
Yeah I'm sorry but nature didn't make us that way. It's fair to protect animals from the food industry but not eating what your body needs isn't solving it.
If you want to avoid meat still do look into how our body doesn't need a lot of Fibre and it causes stomach bloating (like cows, goats).
old people have lots of damage due to food habits. Be careful what you choose
Omega 3 can be in found in vegan foods in flax seed, chia seed, or seaweed. It's very easy to add some chia seeds to rice without affecting the flavour.
B12 is available in nutritional year and fortified plant mills. The "natural" way humans for b12 was by eating bacteria in soil, but since modern farming techniques mean that humans don't eat much soil anymore, is best to supplement. It's more efficient to get b12 directly rather than filter it through the digestive tract of another animal before getting it.
Vitamin D can be synthesised by being in the sun, but since this is a guide for Canadians, and there isn't much sunlight for about half the year, they recommend supplementing. Vitamin D deficiency is very common regardless of diet
I hope that answers your question of how to get these essential nutrients on a vegan diet. I hope you found these tips useful.