Final answer:
The nurse should include an intervention to encourage a high-calorie diet with pancreatic enzyme replacement and to increase protein intake for a preschooler with cystic fibrosis.
Step-by-step explanation:
When planning care for a preschooler with cystic fibrosis (CF), a nurse should focus on nutritional strategies that help manage the disease and its complications. CF is a genetic condition that leads to the production of thick mucus which can cause malabsorption of nutrients in the digestive system. Therefore, one important intervention to include in the care plan is to encourage a high-calorie diet with pancreatic enzyme replacement. This addresses the malabsorption issue and meets the increased energy requirements due to the illness. While increasing caloric intake, it is also beneficial to increase protein intake to support growth and repair within the body. Restricting dietary fats is not generally recommended as fats are an important part of a high-calorie diet and necessary for growth in preschoolers. Additionally, providing a low-carbohydrate diet is not indicated for CF care, as carbohydrates are a primary source of calories needed to meet the high energy demands of children with this condition.