You can benefit from some positive changes as to how you feel and how you react.
closed as off topic by MετάEd, Matt Эллен, Mahnax, tchrist, coleopterist Sep 1 '12 at 1:28
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In my modest humble opinion the word 'as' is needed in the following sentence.
I don't think that it is a 'a porky pretentious verbosity typical of contemporary native speakers of English'.
'porky' in this context presumably meaning 'lying' as in 'porky pies' or 'lies'.
I think that the sentence is typical of contemporary native speakers of English.
Why is the word 'as' added to the sentence?
What does the word 'as' add to the sentence?
I think that it is added to add emphasis. You will experience positive changes in to how you feel and how you react.
By using the word 'as' it is as if the person is being more objective. They are not simply saying 'in my opinion you will feel better' they are saying; 'you will experience the following changes'.
No if you include "as" it actually doesn't make sense. The correct sentence would read: "You can benefit from some positive changes to how you feel and react.". I also emitted the second "how you" as there is no need for repetition in this case.