The present invention provides a beverage, comprising: 5-35% weight/volume fat and/or oil, wherein the fat/oil comprises vegetable oils, and comprises a maximum of 30% weight/volume saturated fatty acids and minimum 20% weight/volume unsaturated fatty acids, said unsaturated fatty acids comprising omega-3-fatty acids and omega-6-fatty acids, and the weight ratio of said omega-6 fatty acids to said omega-3 fatty acids is no greater than 4:1; a maximum of 2.5% weight/volume of carbohydrates; and lactic acid; wherein the content of fat and/or oil is higher than the carbohydrate content by weight. The beverage is especially suitable for patients suffering from inflammatory diseases (Ulcerative Colitis, Rheuma, Multiple Sclerosis), from diabetes and associated chronic diabetes complications (retinopahty, neuropathy, nephropathy, micro- and macrovascular damages e.g. blood vessel damages, myocardial infarction), from neurodegenerative diseases (Alzheimer's, Wernicke-Korsakoff syndrome), and from cancer.