Of course the nutrients from the food you eat are going to end up in the system that your body uses to distribute nutrients! The only way to avoid that is to make your digestive system stop working, with the end result being starvation.
I'd like to see what the blood looks like after one of their supposed "healthy" meals. I wonder if there is a way to form sugar crystals to show how much is there?
And as for the question of whether it's healthy, well, just remember, fat occurs naturally in animals, sugar comes from a completely different category of life forms. Do you think we should inject bacon fat into daisies?
In all of the universe there is only one person with your exact charateristics. Just like there is only one person with everybody else's characteristics. Effectively, your uniqueness makes you pretty average.