[driverdan]

> the carbohydrates in fiber are not digestable, so those calories have effectively no impact on weight

Which is why fiber doesn't get counted towards calories on labels.

> Starches take longer to digest than simple sugars, so they result in less of an insulin response than the same quantity of simple sugars (meaning, if eating in excess, less starch is converted to fat).

That's not what it means. Insulin response cannot create fat out of nothing and doesn't result in more or less fat being stored.

If your glycogen stores are full and you consume more than you burn the excess calories are stored as fat regardless of the source or the pathway that stores it.

Calories in, calories out means you have to factor in how many calories from the food are available for your body to use. It doesn't necessarily mean the calories of the food you put in your mouth.