(5 mins) Transcript. Dr Greger's summary: "B12 deficiency is known as 'The Great Masquerader'".

An article from 2011 on the subject: Vegan B12 deficiency: putting it into perspective (2011).

(7 mins) Transcript. Dr Greger's summary: "One week on a plant-based diet can significantly drop blood levels of homocysteine, a toxin associated with cognitive decline and Alzheimer's disease. Without vitamin B12 supplementation, though, a long-term plant-based diet could make things worse."

(4 mins) Transcript. Dr Greger's summary: "The cardiovascular benefits of plant-based diets may be severely undermined by vitamin B12 deficiency."

(1 min) Transcript.

(2 mins) Transcript. Dr Greger's summary: "The very real and potentially disastrous effects of vitamin B12 deficiency."

(5 mins) Transcript.

(6 mins) Transcript. Dr Greger's summary: "Not taking B12 supplements or regularly eating B12 fortified foods may explain the higher stroke risk found among vegetarians."

(5 mins) Transcript. Dr Greger's summary: "What are the consequences of having to make your own creatine rather than relying on dietary sources?"

(7 mins) Transcript. Dr Greger's summary: "Those on a healthy plant-based diet with elevated homocysteine levels despite taking sufficient vitamin B12 may want to consider taking a gram a day of contaminant-free creatine."

An amazing lecture by Dr Greger — highly recommended.