Wine writers use a variety of different scoring systems to indicate the quality of wines. The Red Wine Diet describes a rating
system based on the amounts of procyanidins measured in wines. The scale was based on a representative selection of 300 wines
from countries mainly in Europe and South America as well as from Australia and the USA. The illustration below indicates
the proportion of these wines falling into each category. Only the top 10% achieved ratings of four hearts (very good) or
five hearts (excellent), 33% were rated as three hearts (good), and 57% scored below this level.