The Alkaline Diet Same year, different fad. The Alkaline Diet. Although this diet was first borne several years ago, it is regaining its former popularity due to food and beverage products such as alkaline water becoming more prevalent in grocery stores and retail outlets.The purpose of the Alkaline Diet is to consume alkaline foods and beverages (which means those with a pH that falls in the range of 7-14) in order to decrease the build-up of acidic compounds in the body tha