"We provided all food to ensure that the composition of the diets differed only in grain source".
These study results and previous research has confirmed that calorie loss was not because of the digestion of extra fiber intake.
According to a statement released by Tufts University announcing the study, the scientists found that those who ate whole grain foods burned an extra 100 calories per day due to their increased resting metabolic rate and greater fecal losses when compared to the group that ate mostly refined grains. American Journal of Clinical Nutrition.
However for the next six weeks, 40 participants stayed on the diet while 41 participants switched to one rich in whole grains. For anyone considering switching to a diet with whole grains, as with any dietary switch, it is important to speak to a medical professional.
The team believe the results are due to a combination of the whole grain diet causing an increase in resting metabolic rate and greater loss of energy in feces.
The participants who ate wholegrains had higher "faecal energy losses" - basically, their bodies absorbed less calories from the food they ate, meaning they pooped those calories out rather than using them for energy or potentially storing them as fat.
The research team said the faecal energy loss (which, by the way, is the flawless name for that punk rock band you've been thinking of forming) wasn't due to the extra fibre in the wholegrains, but rather from the effect that fibre had on how other food calories were digested. The team of researchers also looked into the resulting feelings of hunger and fullness of the participants.
Whole grain foods like whole wheat pasta helps in weight loss
"Many previous studies have suggested benefits of whole grains and dietary fiber on chronic disease risk", says Karl who is now working for the U.S. Army Research Institute of Environmental Medicine in Natick, Massachusetts as nutrition scientist.
Susan Roberts, director of the energy metabolism laboratory at Tufts University in Boston, said the daily difference was equivalent to that burnt off by half an hour's brisk walking.
The grain group includes foods such as rice, wheat, oats, and barley.
Proponents of eating whole grain foods, such as brown rice, oatmeal, and whole-wheat bread, as part of the daily diet now have a new reason to pat themselves on the back.
According to US dietary guidelines, people should swap refined grains with whole grains, with a recommended daily intake of the latter of at least 4 ounces for men and 3 ounces for women. Often, this fiber heavy layer is removed during the refining process.
The 8-week study involved 81 healthy adults, all of whom consumed a Western-style diet high in refined grains for the first 2 weeks. But one thing to keep in mind before you start filling your grocery cart with "whole grain" products is labels can be misleading. Whole grain flour and whole grain kernels were the ideal diet that should be followed.
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