[5][6] He received medical training at George Washington University School of Medicine,[7] where he began exploring vegan diets.

[23] In his active practice, Barnard works with patients with diabetes, obesity, and other conditions in clinical research protocols.

[27] In February 2013, Barnard published the book Power Foods for the Brain: An Effective 3-Step Plan to Protect Your Mind and Strengthen Your Memory.

[4] It argues that a low-fat vegan diet can stabilize blood sugar and insulin function and minimize medication within weeks.

She also suggested that Barnard's low-fat vegan diet would not be suitable for children or pregnant women without expert support.

[34] Barnard plays cello, guitar, and keyboards and has been a member of the bands Pop Maru, Verdun, and Carbonworks.