Abstract: The present invention relates to obesity related diseases, such as cancer of non-alcoholic fatty liver disease (NAFLD). Tissue perfusion is currently investigated by using dynamic contrast-enhanced magnetic resonance imaging which is an invasive technique and does not provide enough accuracy. As a result, the inventors worked on post-processing images of subcutaneous adipose tissue or the epididymal adipose tissue taken with a magnetic resonance imaging technique and a multifrequency magnetic resonance elastography technique to obtain parameters such as loss modulus and storage modulus which are more accurate for a diagnosing purpose. This post-processing method may be applied for a method for predicting that a subject is at risk of suffering from said disease, identifying a therapeutic target or a biomarker and screening compounds useful as medicine.