• Drink coffee after breakfast, not before

    From ScienceDaily@1337:3/111 to All on Fri Oct 2 21:30:42 2020
    Drink coffee after breakfast, not before, for better metabolic control


    Date:
    October 2, 2020
    Source:
    University of Bath
    Summary:
    The new study looked at the combined effects of disrupted sleep
    and caffeine on our metabolism - with surprising results.



    FULL STORY ==========================================================================
    A strong, black coffee to wake you up after a bad night's sleep could
    impair control of blood sugar levels, according to a new study.


    ========================================================================== Research from the Centre for Nutrition, Exercise & Metabolism at the
    University of Bath (UK) looked at the effect of broken sleep and morning
    coffee across a range of different metabolic markers.

    Writing in the British Journal of Nutrition the scientists show that
    whilst one night of poor sleep has limited impact on our metabolism,
    drinking coffee as a way to perk you up from a slumber can have a negative effect on blood glucose (sugar) control.

    Given the importance of keeping our blood sugar levels within a safe range
    to reduce the risk of conditions such as diabetes and heart disease,
    they say these results could have 'far-reaching' health implications
    especially considering the global popularity of coffee.

    For their study, the physiologists at the University of Bath asked 29
    healthy men and women to undergo three different overnight experiments
    in a random order:
    * In one, condition participants had a normal night's sleep and
    were asked
    to consume a sugary drink on waking in the morning.

    * On another occasion, participants experienced a disrupted night's
    sleep
    (where the researchers woke them every hour for five minutes)
    and then upon waking were given the same sugary drink.

    * On another, participants experienced the same sleep disruption (i.e.

    being woken throughout the night) but this time were first given
    a strong black coffee 30 minutes before consuming the sugary drink.

    In each of these tests, blood samples from participants were taken
    following the glucose drink which in energy content (calories) mirrored
    what might typically be consumed for breakfast.



    ========================================================================== Their findings highlight that one night of disrupted sleep did not
    worsen participants' blood glucose / insulin responses at breakfast, when compared to a normal night's sleep. Past research suggests that losing
    many hours of sleep over one and/or multiple nights can have negative
    metabolic effects, so it is reassuring to learn that a single night of fragmented sleep (e.g. due to insomnia, noise disturbance or a new baby)
    does not have the same effect.

    However, strong black coffee consumed before breakfast substantially
    increased the blood glucose response to breakfast by around 50%. Although population- level surveys indicate that coffee may be linked to good
    health, past research has previously demonstrated that caffeine has the potential to cause insulin resistance. This new study therefore reveals
    that the common remedy of drinking coffee after a bad night's sleep may
    solve the problem of feeling sleepy but could create another by limiting
    your body's ability to tolerate the sugar in your breakfast.

    Professor James Betts, Co-Director of the Centre for Nutrition, Exercise
    and Metabolism at the University of Bath who oversaw the work, explains:
    "We know that nearly half of us will wake in the morning and, before
    doing anything else, drink coffee -- intuitively the more tired we feel,
    the stronger the coffee. This study is important and has far-reaching
    health implications as up until now we have had limited knowledge about
    what this is doing to our bodies, in particular for our metabolic and
    blood sugar control.

    "Put simply, our blood sugar control is impaired when the first thing
    our bodies come into contact with is coffee especially after a night
    of disrupted sleep. We might improve this by eating first and then
    drinking coffee later if we feel we still feel the need it. Knowing
    this can have important health benefits for us all." Lead researcher,
    Harry Smith from the Department for Health at Bath added: "These results
    show that one night of disrupted sleep alone did not worsen participants'
    blood glucose/insulin response to the sugary drink compared to a normal
    night of sleep which will be reassuring to many of us. However, starting
    a day after a poor night's sleep with a strong coffee did have a negative effect on glucose metabolism by around 50%.

    "As such, individuals should try to balance the potential stimulating
    benefits of caffeinated coffee in the morning with the potential for
    higher blood glucose levels and it may be better to consume coffee
    following breakfast rather than before.

    "There is a lot more we need to learn about the effects of sleep on our metabolism, such as how much sleep disruption is necessary to impair our metabolism and what some of the longer-term implications of this are, as
    well as how exercise, for instance, could help to counter some of this."
    This week marks International Coffee Day (1 October) in celebration of the widespread appeal of coffee around the world. Coffee is now the world's
    most popular drink, with around two billion cups consumed every day. In
    the US about half of the people in the United States aged 18 and over
    drink coffee every day, whilst in the UK, according to the British Coffee Association, 80% of households buy instant coffee for in-home consumption.


    ========================================================================== Story Source: Materials provided by University_of_Bath. Note: Content
    may be edited for style and length.


    ========================================================================== Journal Reference:
    1. Harry A. Smith, Aaron Hengist, Joel Thomas, Jean-Philippe Walhin,
    Philippa Heath, Oliver Perkin, Yung-Chih Chen, Javier T. Gonzalez,
    James A. Betts. Glucose control upon waking is unaffected by hourly
    sleep fragmentation during the night, but is impaired by morning
    caffeinated coffee. British Journal of Nutrition, 2020; 1 DOI:
    10.1017/ S0007114520001865 ==========================================================================

    Link to news story: https://www.sciencedaily.com/releases/2020/10/201002091053.htm

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