Kahn has been avegan since 1977.[2] He promotes a whole-food plant-based diet consisting of fruit, vegetables, legumes, nuts, seeds and whole grains to preventchronic disease.[6][7] During his lifetime he aims to prevent a million heart attacks.[8] He has commented that "there is no more effective way to prevent and reverse heart disease than eating a plant-based diet naturally low in oils, sugar, and salt."[9] He has noted from measuring the blood and skin levels of his patients that both omnivores and vegans are frequently low invitamin B12,iodine,omega-3,taurine andvitamin K2 and thatvitamin supplements can provide the correct amounts.[10] He advises his patients to support healthynitric oxide levels by getting more exercise andjuicing.[11] He has creditedCaldwell Esselstyn andDean Ornish as influencing his work.[12]
In 2015, Kahn and his wife Karen and son Daniel opened a vegan café, the GreenSpace Café inFerndale, Michigan.[13] It closed in February 2020.[14][15]
