Month: May 2021

What can you add to a wide variety of foods, from cereals to salads, that’s crunchy, filling, and flavorful — and good for your heart? The answer is nuts. While all varieties of nuts are chock full of important nutrients, walnuts may be especially good for protecting cardiovascular health, according to a recent study in the journal Circulation that supports earlier research in this realm.

What is the study?

The Walnuts and Healthy Aging study is a randomized controlled trial supported by a grant from the California Walnut Commission that tracked healthy older adults living in two communities. For the study, researchers recruited 708 adults ages 63 to 79 living in Loma Linda, California, or Barcelona, Spain, and split them into two groups. One group added about a quarter-cup to a half-cup of walnuts to their daily diet for two years, while the other group ate no walnuts.

After two years, average levels of harmful low-density lipoprotein (LDL) cholesterol were modestly lower in the walnut group. Of note: nearly a third of the participants were taking cholesterol-lowering statins, so the average cholesterol levels of both groups were already in a normal range. The researchers speculate that the cholesterol-lowering benefits from walnuts might be more pronounced in people with elevated cholesterol levels. There is no way to know from the current data if this is true.

“This recent trial confirms what earlier studies have found, namely, that that adding walnuts to your diet appears to improve your cholesterol levels,” says Dr. Deirdre Tobias, an obesity and nutritional epidemiologist at Harvard-affiliated Brigham and Women’s Hospital. The new trial also lasted much longer than past walnut studies. However, it’s not clear what foods were being replaced by the walnuts in the participants’ diets, which might affect the magnitude of benefits the researchers saw. For example, replacing unhealthful, ultra-processed snacks with walnuts would presumably have a greater benefit than a lateral move from healthy options to walnuts, Dr. Tobias explains.

Lower levels of harmful blood fats, no additional weight

The researchers also analyzed the concentration and size of the LDL particles. Smaller, more dense LDL particles are more likely to trigger atherosclerosis, the buildup of fatty plaque inside arteries that’s the hallmark of most cardiovascular disease that results in heart attacks or strokes.

The walnut eaters had lower levels of these smaller particles. They also had decreased levels of intermediate-density lipoproteins (IDL), which are also linked to a rise in cardiovascular-related risks. And even though a quarter-cup of chopped walnuts is about 190 calories (and a half-cup is about 380 calories), the walnut eaters did not pack on any extra pounds.

Earlier research has found that people who eat nuts regularly are less likely to have heart disease, and many studies have focused specifically on walnuts. In 2018, Dr. Tobias and colleagues published a meta-analysis and systematic review of studies that examined how eating walnuts affects a person’s blood lipids and other heart-related risks. The review included 26 controlled trials involving a total of more than 1,000 people. It found that walnut-enriched diets led to lower total cholesterol, LDL cholesterol, and triglycerides, the most common form of fat in the bloodstream.

What’s special about walnuts?

Although all nuts are good sources of healthy unsaturated fats, walnuts are especially rich in alpha-linolenic acid (ALA). This is a precursor to the omega-3 fatty acids EPA and DHA found in fatty fish that are known for their heart-protecting powers. Our bodies convert ALA to EPA and DHA, although the efficiency of this varies from person to person.

What’s more, walnuts are usually eaten raw. So they have greater antioxidant abilities than nuts that are usually eaten roasted. (Antioxidants help prevent or reduce the artery-damaging oxidation that contributes to heart disease).

Adding walnuts to your diet

It’s worth noting that the FDA allows a qualified health claim on some nuts (including walnuts). Foods made with them are permitted to include the following statement: “Eating a diet that includes one ounce of nuts daily can reduce your risk of heart disease.” An ounce of walnuts is about a handful, or one-quarter cup.

You can sprinkle walnuts onto oatmeal or other hot or cold cereals; stir them into pancakes, muffins, or other quick breads; or toss them with vegetables or into salads. If high cholesterol is a health concern for you, there are other foods that may help lower your LDL cholesterol and boost your heart health.

That recurring sound that you hear but nobody else does? It’s not all in your head. Well, not exactly.

You may be one of the estimated 50 million-plus people who suffer from tinnitus. The mysterious condition causes a sound in the head with no external source. For many it’s a high-pitched ringing, while for others it’s whistling, whooshing, buzzing, chirping, hissing, humming, roaring, or even shrieking.

The sound may seem to come from one ear or both, from inside the head, or from a distance. It may be constant or intermittent, steady or pulsating. One approach to managing this condition is different forms of sound therapy intended to help people tune out the internal soundtrack of tinnitus.

What causes tinnitus?

There are many possible causes of tinnitus. Long-term exposure to loud noises is often blamed. But other sources include middle ear problems like an infection, a tumor or cyst pinching nerves in the ear, or something as simple as earwax buildup. Tinnitus also can be a symptom of Meniere’s disease, a disorder of the balance mechanism in the inner ear.

Even old-fashioned aging can lead to tinnitus, which is common in people older than age 55. As people get older, the auditory nerve connecting the ear to the brain starts to fray, diminishing normal sounds.

“Neurons (nerve cells) in areas of the brain that process sound make up for this loss of input by increasing their sensitivity,” says Daniel Polley, director of the Lauer Tinnitus Research Center at Harvard-affiliated Massachusetts Eye and Ear. “The sensitivity knobs are turned up so high that neurons begin to respond to the activity of other nearby neurons. This creates the perception of a sound that does not exist in the physical environment. It’s a classic example of a feedback loop, similar to the squeal of a microphone when it is too close to a speaker.”

At times, everyone experiences the perception of a phantom sound. If it only lasts for a few seconds or minutes, it’s nothing to worry about. However, if it pulsates in sync with your heart rate, it’s definitely something to get checked out by a physician, says Polley. If it’s a relatively continuous sound, you should see an audiologist or otolaryngologist (ears, nose, throat specialist).

Can sound therapy help tune out tinnitus?

There is no cure for tinnitus, but it can become less noticeable over time. Still, there are ways to ease symptoms and help tune out the noise and minimize its impact. Treatments are a trial-and-error approach, as they work for some people but not others.

One often-suggested strategy is sound therapy. It uses external noise to alter your perception of or reaction to tinnitus. Research suggests sound therapy can effectively suppress tinnitus in some people. Two common types of sound therapy are masking and habituation.

• Masking. This exposes a person to background noise, like white noise, nature sounds, or ambient sounds, to mask tinnitus noise or distract attention away from it. Listening to sound machines or music through headphones or other devices can offer temporary breaks from the perception of tinnitus. Household items like electric fans, radios, and TVs also can help. Many people with tinnitus also have some degree of hearing loss. Hearing aids can be used to mask tinnitus by turning up the volume on outside noises. This works especially well when hearing loss and tinnitus occur within the same frequency range, according to the American Tinnitus Association.
• Habituation. Also known as tinnitus retraining therapy, this process trains your brain to become more accustomed to tinnitus. Here, you listen to noise similar to your tinnitus sound for long periods. Eventually your brain ignores the tone, along with the tinnitus sound. It’s similar to how you eventually don’t think about how glasses feel on your nose. The therapy is done with guidance from a specialist and the time frame varies per person, usually anywhere from 12 to 24 months.

Additional approaches may help with tinnitus

Depending on your diagnosis, your doctor also may recommend addressing issues that could contribute to your tinnitus.

• Musculoskeletal factors. Jaw clenching, tooth grinding, prior injury, or muscle tension in the neck can sometimes make tinnitus more noticeable. If tight muscles are part of the problem, massage therapy may help relieve it.
• Underlying health conditions. You may be able to reduce the impact of tinnitus by treating conditions like depression, anxiety, and insomnia.
• Negative thinking. Adopting cognitive behavioral therapy and hypnosis to redirect negative thoughts and emotions linked to tinnitus may also help ease symptoms.
• Medication. Tinnitus can be a side effect of many medications, especially when taken at higher doses, like aspirin and other nonsteroidal anti-inflammatory drugs and certain antidepressants. The problem often goes away when the drug is reduced or discontinued.