The T-Factor Fat Gram Counter grew out of The T-Factor Diet, the first popular diet book to show that fat was (and is) the major culprit in the American diet. All calories, Dr. Martin Katahn told us, are not created equal: his metabolic studies showed that the fat we consume in our food, as opposed to the carbohydrate and protein, is converted most efficiently to body fat and may lead to such conditions as cancer, hypertension, heart disease, and...