BJN: The effect of drinking coffee before and after breakfast on human metabolism.

Oct 2, 2020 /--- A new study suggests that drinking a cup of strong black coffee may affect blood sugar levels when you don't get a good night's sleep.
, published by the Centre for Nutrition, Exercise and Metabolism at the University of Bath in the UK, looked at sleep and the effects of morning coffee drinking on a range of different metabolic indicators.
(Photo: www.pixabay.com) scientists write in the British Journal of Nutrition that while lack of sleep has limited effect on our metabolism, drinking coffee as a forced way to raise your spirits can have a negative impact on blood sugar control.
considering the importance of keeping blood sugar levels within safe limits to reduce the risk of diseases such as diabetes and heart disease, they say the results could have "far-reaching implications" for health.
During the study, physiologists at the University of Bath asked 29 healthy men and women to conduct three different overnight experiments in random order: in one case, conditional participants had a normal night's sleep and were asked to wake up in the morning with a sugary drink.
in another case, participants' nighttime sleep was disturbed (the researchers woke them up within five minutes of each hour) and then woke up to drink the same sugary drink.
third case, participants experienced the same sleep disruption, but this time they drank espresso first within 30 minutes of drinking a sugary drink.
, the researchers took blood samples from participants whose blood sugar levels (calories) reflected the energy typically consumed for breakfast.
findings suggest that a one-night sleep interruption did not worsen the participants' blood sugar/insulin response at breakfast compared to normal one-night sleep.
Past studies have shown that losing many hours of sleep in one night and/or more nights can have a negative effect on metabolism, so it's reassuring that scattered sleep every night (e.g., sleep quality decline due to insomnia and noise disturbances) doesn't have the same effect.
, drinking strong black coffee before breakfast can significantly increase your blood sugar response by about 50%.
past studies have shown that caffeine has the potential to cause insulin resistance, although population studies have shown that coffee may be associated with physical health.
, the new study suggests that a common way to drink coffee after an overnight sleep can solve sleepiness, but may create another sensation by limiting the body's tolerance to sugar in breakfast.
, individuals should balance the benefits of coffee with the consequences of elevated blood sugar, preferably after breakfast rather than before.
(bioon.com) Source: Drink coffee after breakfast, not before, for better metabolic control Original source: Harry A. Smith et al, Glucose control upon waking is unaffected by hourly sleep fragmentation over the night, but impaired by morning caffeinated coffee, British Journal of Nutrition (2020). DOI: 10.1017/S0007114520001865.