I have since then thrown in intermittent fasting as well. I fast 22 hours a day, work out at the end of the day, and then go home and eat 1kg of steak/lamb. I think intermittent fasting is worth adding to any diet, vegan or otherwise.
 Book was printed in 1956, so copyright may have expired. There's PDFs online. Here's a link to Stefansson's Wikipedia entry: https://en.wikipedia.org/wiki/Vilhjalmur_Stefansson
 Non-affiliate: https://www.amazon.com/Why-We-Get-Fat-About/dp/0307474259