Final answer:
The best indication of improved nutritional status in a patient receiving TPN would be objective signs such as weight gain, improved lab values, decreased N/V, increased oral intake, and subjective reports of feeling better.
Step-by-step explanation:
The best indication that the patient's nutritional status has improved after 4 days of receiving Total Parenteral Nutrition (TPN) and a nutrition consult would likely be objective, clinical signs such as weight gain (if the patient was underweight), improved laboratory values (e.g., albumin levels), and decreased nausea and vomiting (N/V). A diet recall could also show increased oral intake if the patient was capable of and willing to eat, which might coincide with a lessening of N/V symptoms. Additionally, improved energy levels and activity tolerance may also be indicative of better nutritional status. Considering subjective reports from the patient about feeling better and having more energy can also be considered alongside these objective measures.