What are highly alkaline foods? Strongly alkaline foods refer to foods with an acidity index (pH value) greater than 7.0, which can neutralize acidity in the body and maintain a healthy state. Today, the editor will introduce to you some common highly alkaline foods. Vegetables Vegetables are one of the most alkaline-rich foods. Among them, tomatoes, asparagus, cucumbers, lemons, oranges and green vegetables such as spinach,