For millions of us, the thought of starting the day without a coffee fee is unbearable.
But experts warn that it is better to avoid caffeine heat until breakfast because drinking coffee regularly can increase the risk of developing type 2 diabetes in the long run.
Researchers at the University of Bath asked 29 volunteers to drink a strong black coffee about an hour after volunteering to understand how their blood sugar is affected after breakfast.
Then took a sugary drink – similar to the toast with cereal or jam in calorie content – their blood sugar was about 50 percent higher than when they went without coffee. The caffeine in the drink is believed to prevent the muscles from absorbing sugar.
This may not be an immediate problem, but frequent rise in blood sugar over the years can lead to diabetes and heart disease, according to a study in the British Journal of Nutrition.
Professor James Bates, senior author of the study, said: ‘About half of us wake up in the morning and drink coffee before anything else – the more bored we feel from assimilation, the stronger it is.
‘I like coffee too, and I wouldn’t tell people to go without it, as it has some benefits.
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‘Maybe people should wait a little longer, or until they get to work, so they don’t have caffeine in their system when they eat carbohydrate and sugary snacks.’
It is estimated that around 40 per cent of people in the UK drink coffee while awake.
The researchers wanted to see its effects in people deprived of sleep, so study participants were asked to set an alarm to go every hour of the night.
When they woke up, to make sure they weren’t asleep, the researchers texted them simple questions every 30 seconds, for which they had to answer.
People looked at blood sugar and insulin levels on three occasions – after an all-night sleep at home without coffee, after a broken after-sleep without any coffee on their bed, and after a broken sleep and coffee.
This was 100 mg of strong black coffee – about the size of two standard cups.
Participants’ blood sugar was tested after a snack drink, which they had about 30 minutes after coffee.
The study, published in the British journal Nutritional Nutrition, did not find that coffee or sleep deprivation had an effect on insulin levels.
However, strong black coffee taken for breakfast significantly increased the response to blood glucose, blood tests showed in two hours.
Professor Bates said: ‘This study is important and has many long-term effects on health as long as we had limited knowledge of what coffee does for our bodies, especially our metabolic and blood sugar control.’