Dietary Intervention With Únicla Dairy Products (DANTIAN)

Inclusion Criteria: * Diagnosis of subclinical hypothyroidism * TSH levels between 3 and 10 mIU / L * Normal levels of free triiodothyronine ( T3) and free thyroxine (T4) * Without previous or current treatment with levothyroxine Exclusion Criteria: * Thyroid surgery or reception of radioactive iodine in a previous period of 12 months * History of cardiovascular disease and / or thrombosis * Established diagnosis or clinical suspicion of kidney or liver failure, chronic infections, blood diseases, type I diabetes and type II diabetes * Drug treatments that affect thyroid function (corticosteroids, amiodarone, propranolol, lithium) * Statin treatment and / or hormone replacement therapy * Adjuvant treatment with trace elements, vitamins or antidepressant and antipsychotic drugs * Hospitalization for serious illness or elective surgery in the past 4 weeks * Diseases and / or treatments that affect intestinal absorption (proton pump inhibitors) * Pregnant, planning to become pregnant or breastfeeding women * Consumption of ω-3 PUFA type food supplements * Intolerance and / or allergy to lactose and / or cow's milk proteins * Any pathology that requires close control, advises against their participation or there is an inability to move independently * Habitual residence outside the study's influence area * Participation in another clinical trial with drugs, or in other experimental studies * Refuse to sign the informed consent