"Alkaline" refers to a property of substances that have a pH level greater than 7. These substances can neutralize acids and are often found in bases like baking soda and lye. Alkaline solutions are commonly used in various applications, including cleaning products and cooking, as they can help break down grease and other tough stains. In the context of health, an "alkaline diet" emphasizes consuming foods that promote a higher pH in the body, such as fruits, vegetables, and nuts. Proponents believe that this diet can improve overall well-being and reduce the risk of certain diseases, although scientific evidence on its effectiveness is still debated.