7 grams of Protein = 1 Zone Block (1 Zone serving)
9 grams of NET Carbs = 1 Zone Block (1 Zone serving)
Net Carbs = Total carbs minus Fiber
1.5 grams of Fat = 1 Zone Block (or 1/2 of a Zone serving)
BECAUSE, you need 3 grams of Fat (a full Zone serving) for each Block of Protein/Carbs.
WHY: Because most Low-Fat Protein has some Fat in it.
SO, Dr. Sears says you need to add an additional 1.5 grams of fat for each 7 grams of Protein.
UNLESS your protein is Fat FREE! Then you add a full serving of Fat at 3 grams.
YES, it would have been much easier (and more consistent) for everyone if Dr. Sears just stated that 3 grams of Fat = 1 Zone Block (1 Zone serving) which it does, and it would have been consistent with Protein and Carbs, but he did not, so it requires this detailed explanation.