A 55-year-old woman on ICU following emergency colectomy for toxic megacolon cannot receive enteral nutrition. She is commenced on total parenteral nutrition (TPN). On day 3 of TPN, she develops hyperglycaemia (blood glucose 18 mmol/L), hypertriglyceridaemia (triglycerides 5.5 mmol/L), and abnormal liver function tests (elevated ALP and GGT). What is the most appropriate management?