Nutrition Support Guidelines

Initiation and Monitoring

The American Society for Nutrition recommends correcting electrolyte abnormalities aggressively when they develop, and monitoring more frequently for the first 72 hours, especially for patients at risk of refeeding syndrome 1, 2
Close monitoring is necessary, including monitoring electrolytes (phosphate, potassium, magnesium) during the first 72 hours, watching for clinical signs of fluid overload and cardiac dysfunction, and daily weight measurements to detect fluid retention, as recommended by the European Society for Clinical Nutrition and Metabolism 3
Regularly reassess nutritional status and adjust interventions accordingly, including weight monitoring and recording, as suggested by the European Society for Clinical Nutrition and Metabolism 1, 4

Initial energy intake should be started at 5–10 kcal/kg for the first 24 hours, with close monitoring for refeeding syndrome, as recommended by the American Society for Nutrition 1
Caloric intake should be started at 5-15 kcal/kg body weight per day, with a gradual increase over 5-10 days, alongside prophylactic electrolyte supplementation and thiamine administration before initiating nutrition, as recommended by the American College of Nutrition 5
The goal is to reach full nutritional requirements by days 7-10, as recommended by the Clinical Nutrition society 6

Refeeding syndrome is a potentially fatal condition that can occur in individuals who are malnourished or have undergone significant weight loss, with hypophosphatemia being a key factor, as identified by the European Society for Clinical Nutrition and Metabolism (ESPEN) guidelines 7
Patients with a BMI <16 kg/m², unintentional weight loss >15% in 3-6 months, little or no nutritional intake for >10 days, low baseline potassium, phosphate, or magnesium levels, history of chronic alcoholism, anorexia nervosa, or severely malnourished patients with acute illness are at risk for refeeding syndrome, as recommended by the Clinical Nutrition society 7
Additional risk factors include a BMI <18.5 kg/m², weight loss >10% in 3-6 months, no nutritional intake for >5 days, and history of alcohol misuse or chronic drug use (insulin, antacids, diuretics), as stated by the American Heart Association and the American Stroke Association 7
Older patients may have a higher risk due to comorbidities and reduced physiological reserve, as suggested by the American Academy of Family Physicians 3
Obese patients who may still have malnutrition are also at risk, and adjusted body weight should be used for nutritional calculations in obesity, as recommended by the Society of Critical Care Medicine 5, 8

Hypophosphatemia is the most frequent and clinically significant electrolyte disturbance in refeeding syndrome, often occurring within the first four days after nutrition therapy begins 7
Prophylactic electrolyte supplementation is crucial in high-risk patients, with recommended supplementation of:

Electrolyte	Recommended Supplementation
Potassium	2-4 mmol/kg/day
Phosphate	0.3-0.6 mmol/kg/day
Magnesium	0.2 mmol/kg/day IV or 0.4 mmol/kg/day orally

9, 3, 10, 11, 6

Macronutrient distribution should be 40-60% carbohydrate, 30-40% fat, and 15-20% protein, as recommended by the American College of Nutrition 5
Adequate protein intake should be maintained despite low-calorie diet, with at least 1 g/kg actual body weight/day for BMI <30 and at least 1 g/kg adjusted body weight/day for BMI ≥30, as recommended by the American College of Nutrition 5

Thiamine must be administered before initiating refeeding, with a dosage of 300 mg IV before initiating nutrition therapy, followed by 200-300 mg IV daily for at least 3 more days, as recommended by 12
Water-soluble and fat-soluble vitamins should be administered daily from the beginning of nutritional support, including vitamin A, D, and K, along with thiamine, folate, and pyridoxine to correct deficiency, as recommended by 13

Intravenous erythromycin (100-250 mg 3 times daily) is recommended as first-line therapy for gastric emptying issues, with a strength of evidence based on clinical guidelines from the Clinical Nutrition journal 14
Metoclopramide (5-10 mg PO QID, 30 minutes before meals and at bedtime) is suggested for gastroparesis, based on recommendations from the National Comprehensive Cancer Network 15
Olanzapine (5 mg/day) has both antiemetic and appetite-stimulating properties and is recommended for persistent nausea/vomiting, based on guidelines from the National Comprehensive Cancer Network 15

Continue nutritional support after hospital discharge, and implement organizational changes including multidisciplinary nutritional support teams, as recommended by the American College of Nutrition 16
Monitor food intake for all people with malnutrition, as recommended by the American Heart Association 17
Consider age-related changes in body composition and energy requirements, as recommended by the European Society for Clinical Nutrition and Metabolism 1