What is Pecc?

Also, I was adding a custom food and one thing I don't understand....When it asks for the "carbs by difference", what does that mean?

For example, the flax bread I make has 4 carbs and 4g of fiber....So how do I fill out the carbs by difference area and the fiber area? Do I put "0" for carbs by difference, and still put 4g for fiber?

Ok one more....when you look at your daily food summary, say the total carbs says 10 - Do you then subtract whats in the fiber section to get your true total?