It does get confusing! The reason is probably that some foods are slightly alkaline or slightly acidic. Other foods are very alkaline or very acidic.

See this link for a list of foods that are alkaline, slightly alkaline, acidic or slightly acidic.
http://www.antiaginganswers.net/alkaline_foods.html


The bottom line is that animal products, especially meat, most grains and coffee are very acidic.

Most fruits and vegetables are alkaline or slightly alkaline.