The grapefruit diet has started to gain popularity in the 1930s and actually peaked in the 1980s . Although the use of grapefruit in the diet has undergone several modifications over the years , however, there are only three types of diets grapefruit exceptional related that has been designated as the grapefruit diet .The first two versions of the diet were generally considered " fad diets " and is promoted mainly in very low calorie diets ( VLCD ) or high-protein diets , where the consumption of grapefruit is the mainstay of the supply . The third is the regular use of derivatives in grapefruit or complement a program of overall weight loss .

