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How Exercise Lowers Alzheimer’s Risk by Changing Your Brain

Senior woman on bicycle by beach

More and more studies are showing how regular exercise benefits the brain, and in particular, the aging brain. What’s less clear is how exactly exercise counters the cognitive decline that comes with aging and diseases like Alzheimer’s.

To find out, for nearly a decade, Ozioma Okonkwo, assistant professor of medicine at the University of Wisconsin School of Medicine and Public Health and his colleagues have studied a unique group of middle-aged people at higher risk of developing Alzheimer’s. Through a series of studies, the team has been building knowledge about which biological processes seem to change with exercise.

Okonkwo’s latest findings show that improvements in aerobic fitness mitigated one of the physiological brain changes associated with Alzheimer’s: the slowing down of how neurons breakdown glucose. The research, which has not been published yet, was presented at the annual meeting of the American Psychological Association on Aug. 9.

Okonkwo works with the 1,500 people on the Wisconsin Registry for Alzheimer’s Prevention (WRAP)—all of whom are cognitively normal, but have genes that put them at higher risk of developing Alzheimer’s, or have one or two parents who have been diagnosed with the disease, or both. In the latest study, Okonkwo recruited 23 people from the WRAP population who were not physically active. Eleven were asked to participate in an exercise regimen to improve their aerobic fitness for six months, and 12 served as the control.

All had their brains scanned to track Alzheimer’s-related brain changes including differences in how neurons metabolized glucose, since in people with Alzheimer’s glucose breakdown slows. At the end of the study period, the group that exercised more showed higher levels of glucose metabolism and performed better on cognitive-function tests compared to the controls.

“We are carrying our research full circle and beginning to demonstrate some causality,” says Okonkwo about the significance of his findings.

In their previous work, he and his team identified a series of Alzheimer’s-related biological changes that seemed to be affected by exercise by comparing, retrospectively, people who were more physically active to those who were not.

In this study, they showed that intervening with an exercise regimen could actually affect these processes. Taken together, his body of research is establishing exactly how physical activity contributes to significant changes in the biological processes that drive Alzheimer’s, and may even reduce the effect of strong risk factors such as age and genes linked to higher risk of neurodegenerative disease.

For example, in their earlier work his group confirmed that as people age, the presence of Alzheimer’s-related brain changes increases—including the buildup of amyloid, slower breakdown of glucose by brain cells, shrinking of the volume of the hippocampus (central to memory), and declines in cognitive function measured in standard recall and recognition tests.

But they found that in people who reported exercising at moderate intensity at least 150 minutes a week, as public health experts recommend, brain scans showed that these changes were significantly reduced and in some cases non-existent compared to people who were not active. “The association between age and Alzheimer’s brain changes was blunted,” says Okonkwo, “Even if [Alzheimer’s] got worse, it didn’t get worse at the same speed or rate among those who are physically active as in those who are inactive.”

In another previous study, they found the benefits of exercise in controlling Alzheimer’s processes even among those with genetic predisposition for the disease. When they divided the participants by fitness levels, based on a treadmill test and their ability to efficiently take in oxygen, they found that being fit nearly negated the effect of the deleterious gene ApoE4. “It’s a remarkable finding because it’s not something that was predicted,” says Okonkwo.

In yet another previous study, Okonkwo and his team also found that people with higher aerobic fitness showed lower amounts of white matter hyperintensities, brain changes that are signs of neuron degeneration and show up as brighter spots on MRI images (hence the name). White matter hyperintensities tend to increase in the brain with age, and are more common in people with dementia or cognitive impairment.

They form as neurons degrade and the myelin that surrounds their long-reaching arms—which helps nerves communicate with each other effectively—starts to deteriorate. In people with dementia, that process happens faster than normal, leading to an increase in white matter hyperintensities. Okonwko found that people who were more aerobically fit showed lower amounts of these hyperintensities than people who were less fit.

Given the encouraging results from his latest study of 23 people that showed intervening with exercise can change some of the Alzheimer’s-related brain changes of the disease, he plans to expand his small study to confirm the positive effect that exercise and better fitness can have in slowing the signs of Alzheimer’s. Already, his work has inspired a study launched earlier this year and funded by the National Institutes of Health that includes brain scans to track how physical activity affects biological factors like amyloid and glucose in people at higher risk of developing Alzheimer’s.

The cumulative results show that “there may be certain things we are born with, and certain things that we can’t change ]when it comes to Alzheimer’s risk], but a behavior like physical exercise might help us to modify that,” says Heather Snyder, vice president of medical and scientific relations at the Alzheimer’s Association.

By Alice Park

Source: How Exercise Lowers Alzheimer’s Risk by Changing Your Brain | Time

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Sugar and anxiety are connected in surprising ways

 

There are some things you know are going to make your anxiety worse: WebMDing your stomach ache, foregoing sleep to list all the ways your work presentation could go wrong, calling your friend who freaks out about everything…But treating yourself to a scoop of Rocky Road or a cupcake from your favorite bakery, that’s going to make you feel better right?

Sometimes, 100 percent yes. But other times, that sweet treat can backfire, sneakily causing all sorts of changes that can lead to the opposite of feeling good: anxiety. Here, health experts break down the relationship between sugar and anxiety, and what you can do to combat it.

How are sugar and anxiety related?

The problem with sugar, says hormone health educator Candace Burch, is that it causes blood sugar spikes and drops, which directly affects mood. “The rush of sugar leads to sugar highs, giving a lot of energy, but then the lows lead to feeling sluggish and down.”

“Sugar can exacerbate your feelings of anxiety because of the way our bodies respond to digesting them,” adds Brigitte Zeitlin, RD, owner of BZ Nutrition, a New York-based nutrition practice. “[Sugary foods] cause your blood sugar to spike and then drop faster than they would after eating non-high-sugar-foods. This quick spike and drop causes you to feel uneasy and can even at times mimic a panic attack.” Having low blood sugar levels can actually put the body into a stress response, which, as Zeitlin mentions, can increase anxiety.

Our bodies obviously don’t like being stressed or anxious, says Zeitlin. People combat that in various ways, including reaching for sugary foods. “Foods high in sugar trigger the release of serotonin, which is a feel good hormone,” Zeitlin says. “We are trained to eat sugar and feel good, which makes it understandable why people stress eat, because they just want to feel better when they are feeling stressed and anxious.”

However, when your body is stressed or anxious, you also have higher levels of cortisol (a.k.a. the “stress hormone”). Zeitlin says when this happens, your body suppresses the release of insulin, the hormone that takes up glucose to use for energy. You now have a one-two punch of spiked blood sugar levels (since you’re eating more sugar to combat your stress) and storing excess sugar as fat since you’re not turning it into energy. “So, eating more sugar when you are stressed or anxious just amplifies the amount of sugar your body would naturally have already flowing, and contributes to more severe drops in blood sugar and more drastic drops in your mood,” she says. Enter a cycle of turning to something sweet every time they need another energy and mood boost, and a subsequent rollercoaster of ups and downs which can also contribute to feelings of anxiety.

This sugar-and-anxiety cycle isn’t just relegated to the daytime hours. “High-sugar foods can keep you up because of their energy that prevents your natural stress-booster of sleep from kicking in,” Zeitlin says. “When we don’t get enough sleep we feel even more anxious and stressed because our body missed an opportunity to process it properly.” You’re now going into the next day with less sleep, and thus lower energy levels and higher stress levels. And what do many people reach for to combat stress and anxiety? You guessed it: sugar.

And “high-sugar foods” doesn’t just mean candy, cookies, and cake. “Studies have found that women who eat more refined carbohydrates (baked goods, candy, white breads/rice/cereals, bagels, etc) were more likely to suffer from depression and mood swings because of the drastic peaks and deeps in blood sugar levels,” Zeitlin says.

How to keep sugar from contributing to anxiety

Of course, this isn’t just to freak you out and make you throw out all of the dairy-free ice cream in the fridge. Lots of other things can contribute to anxiety, including stress, coffee, work, and even family relationships—so cutting out Oreos isn’t the magic bullet for reducing anxiety. But the impact of sugar on anxiety levels can affect anyone, says Zeitlin—and if you have an existing anxiety disorder, sugary foods will likely exacerbate your condition, she adds.

One way to combat this is certainly to reduce your sugar intake, including processed foods and breads. It’s also a good idea to load up on foods low in sugar and high in fiber (think veggies, fruit like berries, and whole grains)—Zeitlin says they have a much more even effect on your blood sugar, which can help cut back on feelings of “increased anxiety.” She also recommends stopping eating about two hours before you go to sleep. “This gives your body time to properly digest and process the food—sugary or not—and let that energy subside in time for you to actually fall asleep and stay asleep.”

When you are eating foods higher in sugar, Burch suggests pairing it with foods higher in fiber and healthy fats. “This slows the absorption of sugar, preventing it from spiking blood sugar as much,” she says, and thus making it less likely to put you in an anxiety spiral.

But all this comes with a big caveat: Changing one’s diet shouldn’t be the only thing a person does to fight back against anxiety. “Changing your diet to limit high-sugar foods will not treat or cure your anxiety disorder, but it will help manage it better and optimize the times you are feeling good and less anxious,” says Zeitlin. Psychologist Gail Saltz, PhD, says some ways to reduce anxiety not related to food include deep breathing, working out, and (to bring it all full circle) getting enough sleep. If none of these lifestyle changes are helping, it’s essential to see a professional to help you come up with a treatment plan.

“Sugary foods contribute to mood swings and anxiety. Period,” Zeitlin says. And now that you understand the connection, it’ll be easier to be more mindful when you are consuming foods with sugar in them.

Additional reporting by Jessie Van Amburg.

If you want to cut out sugar completely but don’t know how, here’s some tips. And if your anxiety is worst in the morning, this could be why.

By: Emily Laurence

 

Source: Sugar and anxiety are connected in surprising ways | Well+Good

The Startling Link Between Sugar and Alzheimer’s | Physical and Mental Health – Exercise, Fitness and Activity

A high-carb diet, and the attendant high blood sugar, are associated with cognitive decline.

Source: The Startling Link Between Sugar and Alzheimer’s | Physical and Mental Health – Exercise, Fitness and Activity

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