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    Breaking News

    PUFAs May Help Control Appetite Hormones in Millennials

    Foods such as walnuts, salmon and canola oil provide good, polyunsaturated fats.

    06.19.17
    Newly published research in the journal Nutrition found millennials (ages 18-35) who regularly consume foods that contain polyunsaturated fats (PUFAs), such as walnuts, salmon and canola oil, may experience favorable changes in appetite hormones associated with hunger and satiety. Specific hormones in the body help control appetite. Some hormones are responsible for signaling the body to eat, whereas others tell the body it's full, or satiated. Research is exploring how foods may reduce hunger or increase satiety by influencing these hormones. These types of hormonal changes could ultimately play a role in achieving optimal body weight. 
     
    In this study, researchers looked at physiological hunger and satiety responses by measuring hormone changes, as well as subjective ratings by asking participants to indicate on a scale how hungry or full they were and how much they thought they could eat. Study participants that consumed a diet high in PUFAs had a significant decrease in fasting ghrelin, a hormone that increases hunger, and a significant increase in peptide YY (PYY), a hormone that increases fullness or satiety. Participants saw increases in PYY while fasting and after consuming a meal. These types of hormone changes imply better appetite control. There were no changes in the subjective ratings in either the PUFA-rich diet or the control diet.
     
    "Appetite hormones play an important role in regulating how much we eat," said lead researcher, Jamie A. Cooper, PhD of the University of Georgia. "These findings tell us that eating foods rich in PUFAs, like those found in walnuts, may favorably change appetite hormones so that we can feel fuller for longer."
     
    Researchers enrolled 26 healthy men and women (ages 18-35) who visited the lab for measurements and to receive their meals throughout the study. At the beginning of the study, participants were measured and they consumed test meals high in saturated fat. Researchers then placed subjects on a seven-day diet high in PUFAs or a control diet consisting of a typical American eating pattern. The PUFA-rich diet included whole foods such as walnuts, Alaska salmon, tuna, flaxseed oil, grapeseed oil, canola oil, and fish oil supplements. All meals were provided by the researchers. After the seven-day diet, participants consumed test meals high in saturated fat, again. 
     
    The two diets contained the same number of total calories and percent of calories from fat but differed in the types of fat included. The control diet was comprised of 7% polyunsaturated fat, 15% monounsaturated fat and 13% saturated fat, compared to the PUFA-rich diet which was 21% polyunsaturated fat, 9% monounsaturated fat, and 5% saturated fat. 
     
    Larger and longer-term studies, as well as studies in diverse populations, are needed to clarify population-wide effects. In the context of a whole food diet, such as the diet used in this study, it is difficult to discern whether changes seen with the PUFA-rich diet can be attributed to one specific type of PUFA, food source, or a combination of overall dietary factors. More clinical trials are needed to determine the optimal intake of dietary PUFAs to offer the greatest health benefit. 
     
    Funding for this research was provided by the California Walnut Commission (CWC).
     
    Walnuts PIC “New published research shows millennials (ages 18-35) who regularly consume foods that contain polyunsaturated fats (PUFAs), such as walnuts, salmon and canola oil, may experience favorable changes in appetite hormones associated with hunger and satiety.
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