Re-feeding syndrome can be defined as the potentially fatal shifts in fluids and electrolytes that may occur in malnourished patients receiving artificially refeeding. During refeeding, glycaemia leads to increased insulin and decreased secretion of glucagon. Insulin stimulates glycogen, fat, and protein synthesis. These processes result in a decrease in the serum levels of phosphate, potassium, and magnesium, all of which are already depleted. A nutrition assessment is an evaluation of both objective and subjective data related to an individual's food and nutrient intake, lifestyle and medical history. The data for a nutritional assessment falls into four categories: anthropometric, biochemical, clinical and dietary.