Vegan nutrition refers to the unique set of advantages and challenges that are part of vegan diets. The American Dietetic Association and Dietitians of Canada regard the vegan diet as appropriate for all stages of the life-cycle, though they caution that poorly planned vegan diets can be deficient in vitamin B₁₂, vitamin D, calcium, iodine, iron and omega-3 fatty acids.

Doctors Dean Ornish, T. Colin Campbell, John A. McDougall, Caldwell Esselstyn and Neal D. Barnard claim that high animal fat and protein diets, such as the standard American diet, are detrimental to health. They also state that a lifestyle change incorporating a low fat vegan diet could not only prevent various degenerative diseases, such as coronary artery disease, but reverse them.

Poorly planned vegan diets may be low in vitamin B₁₂, omega-3 fatty acids, vitamin D, calcium, iron and iodine. Nonetheless, well-balanced vegan diets can meet all these nutrient requirements and are appropriate for all stages of the life cycle, including during pregnancy, lactation, infancy, childhood, and adolescence.

Michael Greger, is an American physician, author, vegan and professional speaker. Dr. Greger is a graduate of the Cornell University School of Agriculture and the Tufts University School of Medicine. He became vegan in 1990. He is currently the Director of Public Health and Animal Agriculture at the Humane Society of the United States. His books include Bird Flu: A Virus of Our Own Hatching and Carbophobia: The Scary Truth Behind America's Low Carb Craze.

He appeared as an expert witness to testify about mad-cow disease when cattle producers sued Oprah Winfrey for libel.

John Wayne "Jack" Norris (born August 5, 1942) is a former professional ice hockey goaltender. Although never drafted, Norris went on to play parts of four seasons in the NHL, along with another four seasons in the WHA. He broke into the NHL in the 1964–65 season, playing 23 games as the backup to Eddie Johnston, but lost his spot the following season to Gerry Cheevers. Norris was subsequently dealt to the Chicago Black Hawks, where he played ten games over two seasons. Norris spent significant time in the minor leagues before eventually joining the Los Angeles Kings as the backup to Denis DeJordy. After spending the 1971–72 season in the minor leagues, Norris joined the Alberta Oilers of the WHA. He spent two seasons as the starter in Edmonton and two more with the Phoenix Roadrunners before retiring in 1976.