Effects of Reactive Hypoglycaemia on Cognition in Earlier or Later Chronotypes
This study investigates how certain types of breakfasts affect memory and attention in healthy university students aged 18-25. We're particularly interested in 'reactive hypoglycaemia' – a quick drop in blood sugar after eating. Some foods can cause this, and it might affect how well you think, especially a few hours later. We also want to understand if a person's natural body clock (whether you're an early bird or a night owl, known as chronotype) makes them more likely to experience these blood sugar drops and if it impacts their thinking. The study will compare two types of low-sugar drinks to see their effects on memory and attention and how these relate to individual body clocks.
At a glance
What is this study about?
Imagine you've had breakfast, and a little while later, you feel a bit foggy or can't concentrate as well. This study is trying to understand why this might happen. Scientists are looking at how different types of breakfasts affect your blood sugar levels and, in turn, your thinking skills, like memory and attention. Some studies suggest that if your blood sugar drops too quickly after eating (this is called 'reactive hypoglycaemia'), it could temporarily affect how well your brain works.
Another interesting part of this research is looking at your 'chronotype' – basically, whether you're naturally a morning person or a night owl. The researchers think that night owls, who usually go to bed and wake up later, might be more prone to these blood sugar drops, especially if they eat breakfast earlier in the morning than their body naturally prefers. This study aims to see if drinking a special low-sugar beverage that causes a gentle blood sugar drop affects memory and attention differently than a beverage that keeps blood sugar stable, particularly for those with different body clocks.
By understanding these connections, we might learn more about how to best fuel our brains throughout the day and why some people might feel more mentally sharp or tired at certain times after eating. This could eventually help us make better choices about what and when we eat to support our thinking skills.
Key takeaways
- This study explores how breakfast types affect memory and attention.
- It focuses on temporary blood sugar drops after eating (reactive hypoglycaemia).
- Your natural sleep pattern ('chronotype') might influence these effects.
- Participation involves two study days with special drinks and thinking tests.
- The aim is to improve our understanding of diet and brain function.
- There are specific health and medication exclusions.
Who may be eligible?
This study is looking for healthy university students between the ages of 18 and 25. You would have already taken part in another study called GlyCoBrain. Specifically, they are looking for people who are either strong 'morning people' (early chronotypes) or strong 'night owls' (late chronotypes).
There are several reasons why someone might not be able to join. For example, if you're studying nutrition or home economics, you wouldn't be able to take part. If you have an 'average' body clock (neither very early nor very late), you also won't be eligible. It's also important that you are willing to stop smoking or using cannabis during the study period and able to eat standard evening meals.
You cannot participate if you are very overweight (BMI over 30) or very underweight (BMI under 18.5), as this can affect blood sugar. If you take certain medications like sleeping pills, strong pain relief, antidepressants, or other drugs that affect your thinking or blood sugar, you won't be able to join. People with severe long-term health conditions like diabetes, heart problems, or certain mental health conditions, pregnant or breastfeeding individuals, or those who have recently done shift work or travelled through many time zones are also not eligible.
Could this study suit you?
Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.
- Are you a university student aged 18-25?
- Have you already participated in the GlyCoBrain Observational Study?
- Are you clearly a 'morning person' or a 'night owl', not in between?
- Are you willing not to smoke or use cannabis during the study days?
- Do you have a healthy weight (BMI between 18.5 and 30)?
- Are you free from chronic health conditions and not taking most regular medications?
What does participation involve?
If you join this study, you will be asked to come for two separate study days. On each day, you'll drink a special low-sugar beverage – one designed to cause a small, temporary drop in blood sugar, and the other designed to keep your blood sugar stable. You won't know which drink you're having on which day. After drinking, you'll take several tests to check your memory and attention over the next three hours. Researchers will also take blood samples to measure your blood sugar and other hormone levels. The total duration of your involvement will be these two study days, with no long-term follow-up required after the last visit.
Potential risks and benefits
Locations (1)
- Paderborn UniversityVerified postcodePaderborn, Germany
Common questions
What is 'reactive hypoglycaemia'?
It's when your blood sugar level drops a little too quickly after eating, even after a meal that doesn't usually cause big sugar spikes.
What is a 'chronotype'?
It's your natural body clock, which determines whether you're more of a 'morning person' who likes to wake and sleep early, or a 'night owl' who prefers to wake and sleep late.
Will I know which drink I'm getting?
No, this is a 'blinded' study, meaning neither you nor the researchers will know which beverage you receive on each day until after the study is complete, to keep the results fair.
Will I get paid for taking part?
The information provided does not specify payment, but you can ask the research team about any reimbursement for travel or time.
What kind of tests will I do?
You'll do simple computer-based tests designed to measure your memory and how well you can pay attention.
How to find out more
Always speak to your GP or specialist before deciding to take part in a study.
Interested in taking part?
Discussion
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