Final answer:
The expected outcome of dietary intervention for a patient with anorexia nervosa is typically that the patient's diet will be supplemented with a calorie and protein dense liquid in order to restore weight and nutritional balance safely.
Step-by-step explanation:
When addressing the question of which statement best describes the expected outcome of dietary intervention for a patient who has anorexia nervosa, the most appropriate answer would be that the patient's diet will be supplemented with a calorie and protein dense liquid. This intervention aims at safely restoring weight and nutritional balance, while also addressing the psychological aspects of the disorder. Gaining 4 lbs in 2 weeks through tube feedings might happen in some severe cases, but it is not the primary or most common outcome. Patients may indeed eat more often and try a larger variety of foods as they progress in their recovery, but this process is gradual and part of a larger treatment plan that includes psychological support. Lastly, learning about the effects of dietary fiber on transit time in the gastrointestinal tract, while it might be part of education on healthy eating habits, is not directly related to the primary goals of treatment for anorexia nervosa.