Impact of Energy Density on Energy Intake During Bed Rest
This study investigates how the amount of fat in food influences how much people eat during 60 days of strict bed rest. Lying down for a long time can make people lose their appetite or feel full quickly. Researchers are testing if adding more fat to certain meals affects how much food participants consume. They will serve meals with either normal or increased fat content, making sure the food still looks and tastes the same. Participants can eat as much as they like from these meals for 45 minutes. The aim is to understand how meal richness impacts eating habits in a bed-rest setting, which could be helpful for future space travel or for patients who need long-term bed rest.
At a glance
What is this study about?
This study is designed to understand how the food we eat affects our appetite and how much we consume, especially when someone is on long-term bed rest. Imagine being in bed for 60 days straight, with your head slightly lower than your feet – this is called head-down-tilt bed rest. In this situation, people often don't feel like eating much or might feel full very quickly, which can make it hard to get enough nutrients. This research aims to explore if changing the 'energy density' of food – basically, how many calories are packed into each bite, mainly by adjusting fat content – can influence how much people eat.
Researchers will observe whether people eat more or less when their meals are made a bit richer with added fats, even if the food looks and tastes exactly the same. They'll do this by adjusting the recipes of breakfast or lunch meals for different groups of participants. For example, some participants might get a breakfast with a normal fat level, while others get a breakfast with more fat added, using neutral-tasting vegetable oil so you wouldn't notice the change. Everyone will get to eat as much as they want for 45 minutes.
The findings from this study could be really important. For example, understanding how to encourage better eating in people on bed rest could help astronauts during long space missions or patients recovering from serious illnesses who need to stay in bed for extended periods. It's about finding smart ways to make sure people get the nutrition they need, even when their appetite is affected.
Key takeaways
- This study investigates how much people eat during 60 days of strict bed rest.
- Researchers will secretly adjust the fat content of some meals to see its effect on appetite.
- The study aims to understand better nutrition for astronauts or bed-ridden patients.
- Participants must be healthy, aged 24-55, and meet specific physical requirements.
- You will not be asked to take any medications.
- You can discuss any concerns with the study team at any time.
Who may be eligible?
To be considered for this study, you'll need to be generally healthy, both physically and mentally, and be between 24 and 55 years old. Your body mass index (a measure of your weight in relation to your height) should be between 18 and 28, and your height should be between 153 cm and 190 cm. You'll also need to have a strong bone density, a certificate from your dentist confirming good oral health, and valid medical insurance. If you're a woman, using hormonal contraception is allowed, but the study team will need details about it.
There are several reasons why you might not be able to join. These include having any serious long-term health conditions like heart, lung, kidney, or bone diseases, or past issues with drug or alcohol misuse. If you've smoked in the last six months, or take certain long-term medications that could affect the study results (like those for bone density or blood pressure), you wouldn't be eligible. Also, severe short-sightedness, long-sightedness, or astigmatism, claustrophobia, or special dietary needs that the study team can't accommodate (like being vegan) would exclude you.
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 generally healthy, both physically and mentally?
- Are you between 24 and 55 years old?
- Is your body mass index (BMI) between 18 and 28?
- Do you have good bone density and a healthy bill of dental health?
- Do you have current medical insurance?
- Have you been a non-smoker for at least the last 6 months?
What does participation involve?
If you decide to take part, you'll be involved in a 60-day study where you'll need to stay in bed strictly, with your head tilted slightly downwards. During this time, you'll be provided with all your meals. On specific 'test days,' either your breakfast or lunch will have its fat content adjusted – either a normal amount or a slightly increased amount – without you being able to tell a difference in taste or appearance. You'll have 45 minutes to eat as much as you like from these meals. The researchers will carefully monitor how much you eat. The study plans to run in four separate groups of 12 participants each, meaning you'd be part of one of these groups. The main 'intervention' is the specific meals you'll receive; there are no medications involved. This is a single, continuous 60-day period of bed rest.
Potential risks and benefits
Locations (1)
- University Hospital TuebingenVerified postcodeTübingen, Germany
Common questions
What does 'bed rest with head-down-tilt' mean?
It means you'll lie in bed for 60 days with your head slightly lower than your feet. This mimics some effects of being in space.
Will I know if my food has extra fat in it?
No, the researchers will make sure the food looks and tastes exactly the same, whether it has a normal or increased fat content.
How long will I be in bed for this study?
You will need to stay in bed for a continuous period of 60 days.
Will I have to take any medication?
No, this study does not involve taking any medication. The main focus is on the food you eat.
What happens if I don't eat enough during the study?
The study team will monitor your food intake. If needed, they might provide a nutrient drink to ensure you get enough calories to maintain your body weight.
How to find out more
Always speak to your GP or specialist before deciding to take part in a study.
Interested in taking part?
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