Quote Originally Posted by SadieKate
I don't understand why you are doing the math with an absolute number for fat and a range for carbs.
I'm doing the low end of the fat range and the high end of the fat range to determine whether the range as a whole is valid. It isn't. For the math to work, the percentage of fat + the percentage of carbs + the percentage of protein must = 100. If the equation works for the lowest number in the first range AND the highest number in the first range, then it works for all numbers within the range, and the range is valid.

The math works for the low end of the fat range, because 40% (fat) + 55% (carb) + 5% (protein) = 100%. 55 is within the range for carbs (greater than 50, less than 85).

It doesn't work for the high end, because no matter what carb number you chose from within the given range, the result is always greater than 100.

If the maximum fat percentage is 60, then the minimum carb range cannot be greater than 35 (because we still have to add 5% protein). Conversely, if the minimum carb percentage is 50, then the maximum fat percentage cannot be greater than 45.

Therefore, either the high end of the fat range is wrong, or the low end of the carbohydrate range is wrong.

The numbers tie out in Zones 1 & 2, but not in Zone 3.