Inclusion Criteria:  Be able to give written informed consent Elevated ALT concentrations (>50 U/L for men and >40 U/L for women) Metabolic syndrome according to the NCEP ATP III definition (Grundy 2005) Aged between 18 and 75 years Willingness to consume 20 grams of margarine provided by us on a daily basis for a period of 6 months  Exclusion Criteria:  Are less than 18 years of age or over 75 years of age Females who are pregnant, breast feeding or who may wish to become pregnant during the study Have a significant acute or chronic coexisting illness such as cardiovascular disease, chronic kidney disease, gastrointestinal disorder, endocrinological disorder, immunological disorder, cancer or any condition which contraindicates, in the investigator's judgement, entry to the study Severe medical conditions that might interfere with the study such as epilepsy, asthma, chronic obstructive pulmonary disease, inflammatory bowel disease and rheumatoid arthritis Use of diuretics or insulin therapy History of illicit drug use Consume more than the recommended alcohol guidelines i.e. >21 alcohol units/week for males and >14 units/week for females Not willing to stop the consumption of plant sterol or plant stanol enriched products 1 month before the start of the study (wash-in period) Use of an investigational product in another biomedical study within the previous month