Here are the actual Carb Allowances for each plan:

SPI:

Underweight:
Sedentary - 30 grams/meal w/ 0-15 gram snacks
Somewhat Active - 30-45 grams/meal w/0 -15 gram snacks
Active - 30-60 grams/meal w/ 0-30 gram snacks
Extremely Active - 45-80 grams/meal w/ 0-30 gram snacks

Normal Body Composition:
Sedentary - 30 grams/meal w/ 0-7.5 gram snacks
Somewhat Active - 30-45 grams/meal w/0 -7.5 gram snacks
Active - 30-60 grams/meal w/ 0-30 gram snacks
Extremely Active - 45-75 grams/meal w/ 0-30 gram snacks

Normal Body Composition with "insulin meter":
Sedentary - 15-30 grams/meal w/ 15 gram snacks
Somewhat Active - 30 grams/meal w/0 -7.5 gram snacks
Active - 30-45 grams/meal w/ 0-7.5 gram snacks
Extremely Active - 45-60 grams/meal w/ 0-15 gram snacks

Slightly overweight with Insulin-Meter:
Sedentary - 15 gram meals with 7.5-15 gram snacks
Somewhat Active - 15-30 gram meals with 0-15 gram snacks
Active - 30 gram meals with 0-15 gram snacks
Extremely Active - 45-60 gram meals with 0-7.5 gram snacks

Overweight with Excessive Insulin-Meter:
Sedentary - 15 gram meals with 7.5 gram snacks
Somewhat Active - 15 gram meals with 7.5-15 gram snacks
Active - 15-30 gram meals with 0-15 gram snacks
Extremely Active - 30-45 gram meals with 0-15 gram snacks

** If you are only eating 15 grams of carbs/meal, you must eat 2 snacks


SPII:

There are 4 types of healing programs:

Insulin Sensitive/Healthy Adrenals:
30-35 grams of starchy carbs/per meal + 2 X 15 grams for snacks
OR
40-45 grams X 3 meals (only program that allows the option of no snacks)

Insulin Resistant/Healthy Adrenals:
20 grams X 5 (meals + 2 snacks)

Insulin Sensitive/Burned Out Adrenals:
20-25 grams X3 + 20 grams X 2 snacks

Insulin Resistant/Burned Out Adrenals:
15 grams X 5 (meals + 2 snacks) - lower saturated fats plan

Dr. S. mentions that if you haven't had your tests done, to follow the Insulin Sensitive/Burned Out Adrenals program. It's the default program. Most people are able to figure out their type without the tests, so you might have a clearer idea when you get the book.

Also, if coming off a LC plan, increase your carbs gradually by 5 grams of starchy carbs/meal/week until you reach your limit.