GSA 2019 Annual Scientific Meeting Obesity and multimorbidity are more prevalent among underrepresented U.S. racial/ethnic minority groups. Evaluating whether racial/ethnic disparities in multimorbidity accumulation vary according to body-mass index (BMI) may guide interventions aimed at reducing multimorbidity burden in vulnerable racial/ethnic groups. We used 1998-2014 data from the Health & Retirement Study (N=8,635 partici- pants, age 51-55 years old at baseline) and negative binomial models stratifed by BMI category to evaluate differences in rates of accumulation of seven chronic conditions (arthritis, cancer, diabetes, heart disease, hypertension, lung disease, and stroke), focusing on differences between racial/ethnic groups [White (reference; 64.7%), Black (21.5%), Hispanic (13.8%)]. Overweight and obesity were more prevalent in Black (80.9%) and Hispanic (78.6%) than White (69.9%) participants at baseline; in all BMI categories, Black par- ticipants had higher rates of multimorbidity compared with White participants (normal BMI:β=0.304, p<0.001; overweight:β=0.243,p<0.001; and obese:β=0.135,p=0.013); initial burden of disease was similar between Whites and Hispanics in the normal and overweight categories, but sig- nifcantly lower among Hispanics (vs. Whites) in the obese category (β= -0.180,p=0.017). We found no signifcant dif- ferences in rates of disease accumulation between the racial/ ethnic groups in any of the BMI categories. There are sub- stantial differences in initial disease burden between Black and White middle-aged/older adults, but not in the rate of accumulation of disease between the race/ethnic groups in the 3 main BMI categories. These fndings suggest an op- portunity to reduce racial disparities in multimorbidity by intervening early in the lifecourse to reduce the burden of chronic disease among vulnerable racial minorities prior to entering middle-age. CHRONIC ILLNESSES AND FATIGUE IN OLDER INDIVIDUALS: A LITERATURE REVIEW Maral Torossian, 1 and Cynthia Jacelon 1 , 1. University of Massachusetts Amherst, Amherst, Massachusetts, United States In the United states, 60% of adults have one chronic disease and 40% have at least two chronic diseases. Fatigue is a commonly reported symptom in individuals with chronic illnesses, the prevalence of which ranges between 40-74%. It is associated with multiple risk factors and has a tremendous impact on quality of life, social functioning, mood, motiv- ation and cognition. Despite its high prevalence, the relation- ship between fatigue and chronic illness has not been well explored. Accordingly, the focus of this synthesis of litera- ture is to explore fatigue-associated factors and their relation to chronic disease. The databases searched were CINAHL, PubMed, PsychInfo and Web of Science, where the fol- lowing keywords were used: “Chronic disease” OR “Chronic illness” OR “Chronic conditions”, “Fatigue”, “Elderly” OR “Older adults” OR “Seniors” OR “Geriatrics”. The syn- thesis resulted in four themes: understanding the concept of fatigue, factors related to fatigue, activity and fatigue, and self-management of fatigue. There were some inconsistencies in the fndings among research studies which were addressed, in addition to the strengths and weaknesses of some of the fatigue measurement scales used. This literature review inte- grates fndings about fatigue in chronic illnesses in various aspects, in the population of individuals who are of 65 age or older. The four emerged themes are of value to individuals with similar characteristics as the selected population, as well as to health care providers and researchers who may address the inconsistent fndings and provide a strong evidence for best practice. SESSION 1400 (POSTER) SOCIAL DETERMINANTS OF HEALTH DIMENSIONS OF SOCIAL SUPPORT AND ASSOCIATIONS WITH HEALTH AMONG OLDER ADULTS Samuel Asante, 1 and Eun-Jun Bang 1 , 1. Northeastern State University, Broken Arrow, Oklahoma, United States Social support is fundamental to human survival, and is sig- nifcantly involved in the attainment and maintenance of good health and wellbeing. Previous studies have often considered social support as a singular, non-dimensional construct. While this is important and enlightening, the method of adding up individual aspects to create a singular, non-dimensional con- struct has produced little understanding of these aspects/di- mensions of social support and their implications for health. This study examined three dimensions or types of social support-affective, confdant, and instrumental support-and their associations with physical and mental health in older adults. Data for this study were obtain from Utah Fertility, Longevity, and Aging (FLAG) study. Participants involved 325 older adults, aged 50 years or older. Results showed a signifcant, strong positive correlation between affective sup- port and physical and mental health, and weak association between confdant support and physical and mental health. The correlation between instrumental support and physical and mental health was moderate. After controlling for the in- fuence of socio-demographic variables, affective and instru- mental support signifcantly predicted physical and mental health. Confdant support was not a signifcant predictor of either physical or mental health. The fndings suggest both affective and instrumental support might be relatively more important to the health and mental wellbeing of older adults than confdant support, underscoring the relative importance older adults attach to quality rather than confdant support, which essentially is quantity of social ties. GRANDPARENTAL CAREGIVING AND CO-RESIDENCE, SOCIOECONOMIC STATUS, AND MORTALITY IN RHODE ISLAND CITIES AND TOWNS Julia Broccoli, 1 Steven A. Cohen, 1 and Mary L. Greaney 1 , 1. University of Rhode Island, Kingston, Rhode Island, United States Grandparents co-residing with their grandchildren is be- coming increasingly more common, with over 1.5 million grandchildren living with their grandchildren in the U.S. Furthermore, the number of grandparents who are primary caregivers for their grandchildren has also increased, which can negatively effects the grandparents’ physical and mental health, and increase social isolation and fnancial burden. However, the associations between grandparental caregiving and health outcomes are not well understood on a population Innovation in Aging, 2019, Vol. 3, No. S1 319 Downloaded from https://academic.oup.com/innovateage/article/3/Supplement_1/S319/5615912 by guest on 04 May 2021