A Sardine Diet Intervention Study to Assess Benefits to the Metabolic Profile in Type 2 Diabetes Mellitus Patients

Inclusion Criteria: * Age \> 40 years and \< 85 * BMI ≥ 25 and \< 35 * Patients diagnosed with type 2 diabetes at onset or treated only by diet * HbA1c between 6.0 and 8.0% (based on the last measured and documented laboratory measurement of the previous 3 months) * Usual consumption ≤ 3 fish per week Exclusion Criteria: * T2D treated with antidiabetic oral drugs and/or insulin * Current or previous (within 3 months) intake of omega 3 suplements * Known allergy or intolerance to fish or fish protein * Diagnosis of active neoplasic disease * Suffering from an acute illness which requires a recovery period higher than one week * Currently chronic treatment with oral steroids or nonesteroidal anti-inflammatory for more than 5 days, at least 1 month before randomization * Pregnant or breast-feeding patients * Serious acute vascular events (cardiac or cerebral) diagnosed previous 2 months before the randomization * Current or previous (within 6 months) participation in another study * Chronic renal insufficiency (creatinine \>1,5 mg/dl) * Any conditions that the investigator considers may render the patient unable to complete the study During the interventional study, based on current standards of T2D care, doctors will introduce anti-diabetic oral drugs or insulin into the patient's treatment, where they consider it to be necessary.