CBC
Chemistry
Magnesium
Phosphorus
ECG
Hypokalemia, hypomagnesemia
Metabolic acidosis
ECG: May cause prolonged QTc
Hypophosphatemia
Leading to hemolysis, hypotension, altered mental status
Leading to hemolysis, hypotension, altered mental status
Refeeding syndrome
Fluid overload
Starvation ketoacidosis
Insulin secretion
Diabetic ketoacidosis 
Loss of myocardium
Diabetic ketoacidosis
Na absorption