Metabolic syndrome (MS) and non-alcoholic steatohepatitis (NASH) have been associated with bad eating habits. Supplementation with coconut oil (CO) has been proposed to control these conditions, as some authors suggest that CO provides weight loss and cardiovascular protective effects. However, the effectiveness and safety of emerging diets, such as CO, remain uncertain. This review focuses on the utilization of CO in the control of MS and NASH, besides in addition to describing this cardiovascular and weight loss effects, with special attention to the possible unfavourable impacts on human health, based on clinical and experimental studies.