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Obesity clinical trials at UC Davis
8 research studies open to eligible people

  • A Study of Olive Oil Polyphenols (nutrients in plant-based food) and Cardiovascular Health

    open to eligible people ages 20-45

    The purpose of this research is to investigate whether consuming two different kinds of olive oil will change risk factors related to cardiovascular disease, including levels of good and bad cholesterol, levels of inflammation, and levels of gene expression.

    Davis, California

  • A Study of Snacks and Satiety (feeling fed)

    open to eligible females ages 18-45

    This study is designed to compare two types of snacks (almonds or a cereal-based snack), eaten between meals, on measures of appetite, including appetitive hormones, self-reported feelings of hunger and fullness, and food intake at a buffet meal or in the home environment. The investigators hypothesize that the acute responses of appetitive hormones to a meal challenge protocol will differ between almond and cereal-based snacks based on multivariate models of satiety that will be predictive of ad libitum food intake at a dinner meal as part of the meal challenge protocol. Further, the investigators will estimate if, under free-living conditions, self-selected and self-reported food intake will show appropriate energy compensation for the added calories of the snacks, and determine if one type of snack is superior to the other in this regard.

    Davis, California

  • A Study of the Effects of Sweet Cherry Juice on Metabolism (converting food to energy) and Heart Health

    open to eligible people ages 20-65

    This study aims to determine the effects of consuming sweet cherry juice on cardiovascular function, glucose regulation, and lipid status in overweight human subjects. The investigators hypothesize that sweet cherry juice consumption will improve metabolic and physiological status in overweight persons compared to a placebo.

    Davis, California

  • Koa Family: California's Obesity Prevention Project

    “This study hopes to learn if a new whole health program improves the health of low-income mothers.”

    open to eligible females ages 18-47

    The purpose of this study is to learn if a new whole-person lifestyle program improves the health of low-income mothers.

    Sacramento, California

  • Metabolic Effects of Sugar and Aspartame

    “What are the effects of consuming sugar- and aspartame-sweetened beverages with standardized diets?”

    open to eligible people ages 18-40

    It is not known whether consumption of excessive amounts of sugar can increase risk factors for cardiovascular disease or diabetes in the absence of increased food (caloric) intake and weight gain, nor whether the negative effects of sugar consumption are made worse when accompanied by weight gain. This study will investigate the effects of excess sugar when consumed with an energy-balanced diet that prevents weight gain, and the effects of excess sugar when consumed with a diet that can cause weight gain. The results will determine whether excess sugar consumption and excess caloric intake that lead to weight gain have independent and additive effects on risk factors for cardiovascular disease or diabetes, and will have the potential to influence dietary guidelines and public health policy.

    Davis, California and other locations

  • Study of the Relationship Between Body Composition, Insulin Resistance and HDL Levels

    “HDL Study”

    open to eligible people ages 18-75

    Approximately 20 million people in the United States have some form of kidney failure. People with kidney failure have an increased chance of having low levels of high density lipid (HDL), so called "good cholesterol." Patients who are overweight or obese also have low levels of HDL. The investigators are trying to find out whether causes of low HDL are the same in people who are overweight and in patients with kidney failure so that in the future doctors can better treat low HDL cholesterol levels. People with low levels of HDL are more likely to have heart attacks and strokes and are more likely to lose kidney function. This study hope to learn more about how kidney failure causes low HDL cholesterol levels.

  • Studying Metabolic Responses to Bariatric Surgery

    “Using tissue samples to better understand the metabolism and genetics of obesity”

    open to eligible people ages 18-65

    Research the genetic and biomechanical markers of human adipose tissue on patients with morbid obesity. Additional tissue/fluid collection is also gathered during the time of surgery.

    Sacramento, California

  • Walnut Study

    “Postmenopausal Women Needed for a Research Study”

    open to eligible females ages 45-65

    This study seeks to confirm and extend previous finding that four weeks of daily intake of 40 g of walnuts improve microvascular function, increasing the reactive hyperemia index (RHI), effects which were greatest in individuals with the worst initial RHI and correlating to circulating levels of vasoactive plasma epoxides. The current trial will enroll postmenopausal women who are at risk for cardiovascular disease due to their menopausal status and increased central adiposity. The initial trial focused on non-esterified (i.e. plasma) derived oxylipins, but substantial and unique changes were also observed in the esterified lipoprotein pool. The current study will add the esterified lipoprotein pool, important, as the mechanisms by which walnut intake influences endothelial function are currently undefined, but may include lipoprotein induced modulation of vascular hemostasis. As a secondary objective, primary metabolism and urolithin metabotype will be analyzed as a way to capture the influence of potential differences in habitual diet and metabolism on physiologic response. Therefore, this study will combine measures of cardiovascular physiology, metabolomics, and walnut-derived metabolite analyses to assess the 12 week influence of 40 g of daily walnut intake on the health of overweight and obese postmenopausal women.

    Davis, California

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