On the contrary, research at the Lund University Faculty of Engineering shows that bread baked with white rye flour, which is flour made from the inner, white part of the rye kernel, leads to better insulin and blood sugar levels compared with wheat bread with rye bran.
White rye flour thus leads to much better values than both regular wheat flour and rye bran. At the same time, much of the bread that is sold in stores today in most countries is in fact baked with wheat flour and bran from various grains.
The great difference between white rye and white wheat surprises the researchers.
"Precisely what it is that makes rye lead to a stable blood sugar curve is as yet unknown. But we are getting closer and closer to an answer. There are several different types of rye, and all not all types have the same effect, which means that some of them can be omitted from future studies. The rye flour that is sold in stores is often a mixture of different types," says Liza Rosén, a doctoral candidate in Applied Nutrition and Food Chemistry at the Lund University Faculty of Engineering, who has led the study. The research is part of the EU project "Healthgrain", in which researchers study how wholemeal products can be used to prevent diseases including type 2 diabetes and heart and vascular diseases.
According to Liza Rosén, if you want to optimize the health benefits, you should eat porridge or bread made from whole grain, where all the parts of the grain are included.
"This gives you all the benefits of rye. The bran includes many healthful fibers, vitamins, minerals, and antioxidants. This also helps give a feeling of satiety and helps lower blood sugar responses over the long term. On the other hand, we did not see such good results regarding blood sugar and insulin directly after the meal," she says.
In meal tests the researchers also found that individuals who ate boiled rye kernels for breakfast were fuller and ate significantly less for lunch, more precisely 16 percent less in energy intake, compared with those who ate bread made from white flour. They also found that both bread and hot cereal made with white rye and wholegrain rye are more filling than white wheat bread. The most effective form was rye porridges.
"It is probably the water in the porridge that increases the feeling of satiety. But the water has to be mixed into the product. If you drink the same amount of water with rye bread, the results are not as good," she explains.
The original objective of Liza Rosén's research was to try to determine the reasons that wholegrain products are so beneficial, in that they have been shown to protect against cardiovascular diseases and certain types of cancer. There is also strong evidence that whole grains can prevent type 2 diabetes and insulin resistance.
"Since rye has been shown to yield low insulin responses, I started with that. A high insulin response can lead to insulin resistance in the body, that is, that the body has a hard time responding to insulin. Insulin resistance can result in high blood sugar, high blood pressure, and bad blood fats, which in turn increase the risk of age-related diabetes and cardiovascular diseases. Since I have found so much of interest, I haven't had yet time to look into barley, for instance, but perhaps in the future. On the other hand, several other researchers at Lund University have studied barley and its health benefits," says Liza Rosén.
Liza Rosén has not carried out any studies of how rye affects humans over the long term, but her colleague Ulrika Andersson did such a study on mice. For a half year a number of mice were fed wholegrain wheat or wholegrain rye, respectively. The results show that the mice that ate wheat gained significantly more weight than the mice on a rye diet.
"A possible explanation would be that wheat prompts a higher insulin response than rye, which means that the cells in the body can store more fat. The fact that rye contains more soluble fibers than wheat also plays a role, since they probably prevent the uptake of fat and other nutritional substances in the intestine."
There are only a few studies of how wholegrain forms of various cereal grains affect our health, so there is a great need for more detailed studies of the issue. Enhanced knowledge in this field creates a base for the development of a new generation of custom-designed wholegrain products that can counteract different types of diseases associated with our prosperity.
How the tests were done:Study 1:
Since the researchers found that the products that led to low insulin release provided greater satiety after three hours, they designed a second study to address the question: Can rye products that lead to low insulin response provide greater satiety and reduce the food intake in the following meal?Study 2:
In an ongoing third study, the researchers are investigating different kinds of rye.For more information, please contact Liza Rosén, doctoral candidate in Applied Nutrition phone: +46 (0)46-222 95 34, Liza.Rosen@appliednutrition.lth.se,
For the mouse model: Ulrika Andersson, doctoral candidate Molecular Signaling, +46 (0)46-222 81 28, Ulrika.Andersson@med.lu.se ,
Supervisor Cecilia Holm, firstname.lastname@example.org, 046-222 85 81. Both doctoral candidates are currently on parental leave but read mail regularly and answer the phone whenever possible.Pressofficer Kristina Lindgärde;
Kristina Lindgärde | idw
Millions through license revenues
27.04.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn
New High-Performance Center Translational Medical Engineering
26.04.2017 | Fraunhofer ITEM
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
28.04.2017 | Event News
20.04.2017 | Event News
18.04.2017 | Event News
28.04.2017 | Life Sciences
28.04.2017 | Life Sciences
28.04.2017 | Life Sciences