I am asking for clarification in the Forever Abstinent book on what “1 teaspoon of fat” means for “The first 30 Days” and “After the First 30 Days.”

Here is the short-form answer:
First 30 Days:                   1 teaspoon of ANY type of fat
After the First Days:        1 teaspoon of ANY type of fat
Maintenance:                   See list of fat quantities in MAINTENANCE ONLY in Forever Abstinent 

For the first 30 days and after that until maintenance, we are dealing with one quantity of fat, which is 1 tsp.  ANY type of fat is allowable as long as the quantity is 1 tsp. The type of fat is not relevant, 1 tsp. of fat is 1 tsp. of fat.

Only on maintenance are additional quantities of fats allowed and the quantities vary dependent on the type of fat.  Because on the Maintenance food plan the quantity of the additional fats varies, it is necessary to list the types of fat with the quantity for that particular fat. It is not necessary to list the types of fat in the First 30 Days or After the First 30 Days because the quantity does NOT vary; any type of fat is allowable but the quantity always remains 1 tsp.

The narrative portion of Forever Abstinent states “You should infer healthy fat.” This is an inference and not a requirement. Pursuant to our Twelve Traditions, we leave health matters to the professionals.