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Doctors' Answers to "Frequently Asked Questions" - Digestion
Answer: Stomach secretions are acidic. Pancreatic and liver secretions are basic. Once the food enters the small intestine it is neutralized by pancreatic secretions so that the resultant is close to body pH.
Answer: The blood does get rerouted to the GI tract post prandially. High sugar/carbohydrate diets like you describe would persist for a shorter amount of time. Protein and fat take longer to digest. No one has done effective studies on alertness, brain function etc. in this scenario that are clinically useful.