Researchers say three diets – Mediterranean, low-fat and low-carbohydrate – are equally effective in helping reverse blocked arteries. Israeli researchers, who conducted the study of 140 people, found that diet could reduce the fatty build up in arteries.The findings have been published in the journal, Circulation. The Ben-Gurion University team found by the end of the two-year study the arterial wall was cut by 5 per cent. Experts, however, said the study was interesting, but diet is not a magic bullet.