“But those whose diets were highest in fat — compared to the lowest — were 42 percent less likely to face cognitive impairment, and those who had the highest intake of protein had a reduced risk of 21 percent. When total fat and protein intake were taken into account, people with the highest carbohydrate intake were 3.6 times likelier to develop mild cognitive impairment.”
19 OCT 2012
Those 70-plus who ate food high in fat and protein fared better cognitively, research showed
ROCHESTER, Minn. — People 70 and older who eat food high in carbohydrates have nearly four times the risk of developing mild cognitive impairment, and the danger also rises with a diet heavy in sugar, Mayo Clinic researchers have found. Those who consume a lot of protein and fat relative to carbohydrates are less likely to become cognitively impaired, the study found. The findings are published in the Journal of Alzheimer’s Disease.
The research highlights the importance of a well-rounded diet, says lead author Rosebud Roberts, M.B., Ch.B., a Mayo Clinic epidemiologist.
“We think it’s important that you eat a healthy balance of protein, carbohydrates and fat, because each of these nutrients has an important role in the body,” Dr. Roberts says.
Researchers tracked 1,230 people ages 70 to 89 who provided information on what they ate during the previous year. At that time, their cognitive function was evaluated by an expert panel of physicians, nurses and neuropsychologists. Of those participants, only the roughly 940 who showed no signs of cognitive impairment were asked to return for follow-up evaluations of their cognitive function. About four years into the study, 200 of those 940 were beginning to show mild cognitive impairment, problems with memory, language, thinking and judgment that are greater than normal age-related changes.
Those who reported the highest carbohydrate intake at the beginning of the study were 1.9 times likelier to develop mild cognitive impairment than those with the lowest intake of carbohydrates. Participants with the highest sugar intake were 1.5 times likelier to experience mild cognitive impairment than those with the lowest levels.
But those whose diets were highest in fat — compared to the lowest — were 42 percent less likely to face cognitive impairment, and those who had the highest intake of protein had a reduced risk of 21 percent.
When total fat and protein intake were taken into account, people with the highest carbohydrate intake were 3.6 times likelier to develop mild cognitive impairment.
“A high carbohydrate intake could be bad for you because carbohydrates impact your glucose and insulin metabolism,” Dr. Roberts says. “Sugar fuels the brain — so moderate intake is good. However, high levels of sugar may actually prevent the brain from using the sugar — similar to what we see with type 2 diabetes.”
Exercise may lead to better school performance for kids with ADHD
EAST LANSING, Mich. — A few minutes of exercise can help children with attention deficit hyperactivity disorder perform better academically, according to a new study led by a Michigan State University researcher.
The study, published in the current issue of the Journal of Pediatrics, shows for the first time that kids with ADHD can better drown out distractions and focus on a task after a single bout of exercise. Scientists say such “inhibitory control” is the main challenge faced by people with the disorder.
“This provides some very early evidence that exercise might be a tool in our nonpharmaceutical treatment of ADHD,” said Matthew Pontifex, MSU assistant professor of kinesiology, who led the study. “Maybe our first course of action that we would recommend to developmental psychologists would be to increase children’s physical activity.”
While drugs have proven largely effective in treating many of the 2.5 million school-aged American children with ADHD, a growing number of parents and physicians worry about the side effects and costs of medication.
In the study, Pontifex and colleagues asked 40 children aged 8 to 10, half of whom had ADHD, to spend 20 minutes either walking briskly on a treadmill or reading while seated. The children then took a brief reading comprehension and math exam similar to longer standardized tests. They also played a simple computer game in which they had to ignore visual stimuli to quickly determine which direction a cartoon fish was swimming.
The results showed all of the children performed better on both tests after exercising. In the computer game, those with ADHD also were better able to slow down after making an error to avoid repeat mistakes – a particular challenge for those with the disorder.
Pontifex said the findings support calls for more physical activity during the school day. Other researchers have found that children with ADHD are less likely to be physically active or play organized sports. Meanwhile, many schools have cut recess and physical education programs in response to shrinking budgets.
“To date there really isn’t a whole lot of evidence that schools can pull from to justify why these physical education programs should be in existence,” he said. “So what we’re trying to do is target our research to provide that type of evidence.”
Pontifex conducted the study for his doctoral dissertation at the University of Illinois before joining the MSU faculty. His co-investigators included his adviser, kinesiology professor Charles Hillman, and Daniel Picchietti, a pediatrician at the Carle Foundation Hospital in Champaign, Ill. The research was funded by the National Institute of Child Health and Human Development.