Here is something I found on the internet today that shows the WW formula for assigning point values to foods.
A points score is given to a variety of foods based upon the portion size, the calories that portion contains, the amount of fiber and the amount of fat contained in every serving. Generally, foods which are high in fat will have a high points score and high fiber foods will have a low points score. The daily allowance for dieters is then dependent upon things like body weight and amount of weight loss he or she wishes to achieve.
The points formula is as follows:
p = (c/50) + f/12 - (min {r,4}/5)
Where: p = Points | c = Calories | f = Fat Grams | r = Dietary fiber Grams
(Please note: in the term (min{r, 4}) no more than 4 grams of fiber are used in the calculation. For example, if the actual dietary figure is under 4 then this figure is used, however, where the figure is greater than 4 then 4 is used.)
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