br A raw food vegan diet may be defined in various ways, but usually entails at least 80 by weight being raw plants. Many people report feeling healthier and more energetic on adopting such diets, but there are too few long-term raw food vegans for direct evaluation of the success of raw vegan diets versus other diets. We can, however, evaluate such diets against known human nutritional requirements to gain a better understanding of the ways in which appropriate raw vegan diets could benefit health. br Raw vegan diets comprise three key food groups: sweet fruit, high-fat plants and green leafy vegetables. Raw food authorities differ in the proportions recommended, some suggesting that 2 of calories from green leafy vegetables (about 300 g of lettuce per day) is sufficient while others recommend that about 30 of calories should come from green vegetables. Similarly, recommendations on high fat foods such as avocados, olives, nuts, seeds and cold-pressed oils range from a few percent to about 40 of calories. The Hallelujah diet founded by George Malkmus puts particular emphasis on carrot juice and barley grass, which contribute about 15 of calories.