Dr. Zoë Harcombe writes extensively on
Is Veganuary healthy?
ALA, calcium, complete protein, DHA, EPA, iodine, iron, nutrient deficiency, omega 3, retinol, selenium, supplements, Vegan, vegan diets, vitamin B12, Vitamin D Deficiency, zinc ...
Snippet:
* The answer to the Veganuary site’s own question “Is a vegan diet healthy?” was a quotation from the US Academy of Nutrition and Dietetics that “a vegan diet is nutritionally adequate.” This is not true. A vegan diet is not nutritionally adequate – it requires supplementation.
* A vegan diet does not provide retinol, B12, D3, heme iron or omega-3 in the forms needed by the body. A vegan diet is likely deficient in calcium, iodine, iron and zinc.
* The health information on the Veganuary.com campaign site did state the importance of vital nutrients. It rarely clarified the form of the nutrient required by the body (the animal form) and the fact that conversion from plant to animal forms of nutrients is poor, if possible, at all.
Considerably more at link.