Nutritional Supplementation in the Elderly With Weight Loss

Inclusion Criteria: * Male or female age 65 and older * Non-smokers * Weight loss \>3% body weight over 6-12 months * BMI ≤ 25 * Living independently or in an assisted living facility Exclusion Criteria: * Medical conditions that would lead to weight loss * Active cancer undergoing treatment (chemotherapy, radiation therapy, or planned surgical intervention) * CKD stage IV-V (eGFR \<30) based on medical records within the last 12 months * Presence of dysphagia or odynophagia * Actively taking blood thinner such as Warfarin * Known history of cirrhosis with presence of ascites * History of a surgical procedure for weight loss (e.g. gastroplasty, gastric bypass, gastrectomy or partial gastrectomy, lap-band) * Any abnormal lab findings outside of normal limits as determined by the investigator * Dietary conditions * Diet restrictions including vegetarianism, veganism, soy-free diet, * Fish and/or fish oil allergy or intolerance * Milk allergy excluding lactose intolerance * Follows a kosher diet * Medications * Use of appetite stimulants (including megestrol, dronabinol and cyproheptadine). * Does not include medications used for depression (e.g. mirtazapine, paxil) if patient has been on a stable dose of this medication for at least 3 months prior to the start of this study * If participant is already taking a fish oil supplement, he/she must be willing to either stop the supplement or take the supplement the investigators are using in the study depending on the randomization assignment * Additional * Patient has implantable device such as a pacemaker or ICD * Unable to complete 6-minute walk test at baseline * Hospitalization within the last 30 days * Participation in a therapeutic research study within 30 days of baseline * Living in a skilled nursing facility or long-term care facility * Any other medical condition that principal investigator or co-investigators deem would preclude the patient from study participation