Total cholesterol of 5.42 mmol/L is abnormal and is at a borderline elevated level, the high is not particularly serious. Long-term elevated cholesterol can lead to the occurrence of atherosclerosis, so it is also important to pay attention early and control cholesterol to reach the normal index. First of all, you must have a light diet, avoid overeating, maintain a good lifestyle, eat more food rich in dietary fiber and fresh fruits and vegetables, which can promote the body to excrete toxins and metabolic waste and keep the gastrointestinal tract clear, which is good for lowering cholesterol. Secondly, we should insist on physical exercise to prevent obesity and maintain a standard weight. For patients who already have diabetes, hypertension and coronary heart disease, elevated cholesterol can aggravate atherosclerosis, so you can take oral statins, which have a cholesterol-lowering effect and can also prevent plaque formation and progression, but you must pay attention to the regular review of liver function and creatine kinase.