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Probiotic supplements containing helpful bacteria and yeast are marketed as a way to maintain a diverse mix of healthy gut microbes. Now, a review published online July 6, 2020, by BMJ Nutrition, Prevention & Health suggests that probiotic supplements may help relieve depression symptoms. Scientists evaluated seven clinical trials from the past 15 years, which tested a total of 12 different strains of helpful bacteria. One trial in the review tested a "prebiotic," a type of plant fiber that provides food for gut bacteria. Scientists concluded that 11 of these probiotics, either alone or combined with prebiotics, were potentially useful for relieving symptoms of depression, perhaps by reducing inflammation that could affect brain function. The studies were small and short-term, but taken together, they suggest a gut-based approach to maintaining emotional well-being is worth pursuing. In the meantime, talk therapy, exercise, and medications remain the most effective approaches to treat depression. To support your gut health without expensive probiotic supplements, enjoy foods that naturally contain probiotics, such as yogurt, kefir, and sauerkraut. The prebiotic powers of whole grains also may support a healthy gut.

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People who regularly worried about the future and dwelled on the past saw larger drops in cognition and had more harmful brain proteins than those who didn't.

Chronic worrying or ruminating could be bad for your brain. A study published online June 7, 2020, by Alzheimer's & Dementia linked these negative thinking patterns to brain changes that could be associated with Alzheimer's disease.

Study authors found that older adults who regularly engaged in what the authors called repetitive negative thinking were more likely to experience cognitive decline, including memory problems, than those who didn't. They also had higher levels of the proteins beta-amyloid and tau in their brains. The accumulation of these proteins, which create damaging clumps known as plaques and tangles in the brain, is a hallmark of Alzheimer's that begins in the earliest stages of the disease — even before an individual experiences visible symptoms of dementia.

The trials and challenges of this year are weighing heavily on many people, but attempting to employ positive psychology to put personal struggles in context, and accepting the ups and downs life brings, can ultimately increase positive feelings and provide perspective.

With the introduction of benzodiazepines such as chlordiazepoxide (Librium) and diazepam (Valium) in the early 1960s, a new era in the treatment of insomnia and anxiety began. The benzodiazepines were more effective and far safer than the older drugs — barbiturates, meprobamate, and glutethimide — that had been prescribed for these purposes. For many years, benzodiazepines continued to be the most popular prescription tranquilizers and sedatives. Since the mid-1980s, new alternatives have been assuming some of these roles, but benzodiazepines are not about to leave the stage.

More than a dozen benzodiazepines are available by prescription. Benzodiazepines have a common basic chemical structure, and they all increase activity at receptors for the neurotransmitter gamma-aminobutyric acid (GABA). This transmitter inhibits the activity of neurons, slowing down the brain and nervous system. Benzodiazepines differ mainly in how quickly they are absorbed, how long their effects last, and how long they take to leave the body.

Shifting your thinking and practicing deep breathing can help when you're stuck in an intense emotional moment.

At some point, we've all gotten stuck in a "meltdown" moment — an overwhelming feeling of anger or stress that was difficult to shake off. "Feeling overwhelmed makes it harder to identify ways to get unstuck; the options seem limited, which can create a sense of hopelessness or despair. Additionally, negative memories may come to mind more readily, and we may filter out useful ways of viewing the situation at hand," says Abby Altman, an associate psychologist at Harvard-affiliated Brigham and Women's Hospital.

But there are ways to shift your focus and break out of extremely emotional moments. Take note of the following tips so you can put them to work if a meltdown strikes.

Not all memory issues are cause for concern. Here is how to manage those annoying everyday lapses.

Everyone experiences the occasional "senior moment" as they age. You may misplace everyday items, fail to recall the name of someone you just met, or forget to do something. While these memory slips can be embarrassing and stressful, they usually don't mean that you are on a path to dementia.

"Some degree of memory lapses is a normal part of aging," says Lydia Cho, a neuropsychologist with Harvard-affiliated McLean Hospital. "You can't expect to hold on to all information you've gathered throughout your life, whether it was long ago or recent. It's not realistic or adaptive."

If you have experienced a heart attack or undergone a heart procedure, don't neglect your mental health during recovery.

Recovery from a heart attack, heart failure, angioplasty, or heart surgery — what doctors call heart events — can be stressful. Depending on your condition, it may also involve cardiac rehabilitation. This medically supervised program focuses on exercise, diet, and lifestyle changes. While the primary focus is to help you physically, you also need to address your mental and emotional health.

"It's normal to have some anxiety and stress after a heart attack or heart surgery," says Dr. Christopher Celano, assistant professor of psychiatry at Harvard-affiliated Massachusetts General Hospital. "But how long these feelings linger, and whether they are also associated with symptoms of depression, can affect your rehab recovery success and potentially increase your risk of future problems."

Listening to music or playing an instrument engages multiple parts of your brain — and can help your mood and memory.

Music has the ability to soothe, energize, and even to improve your memory. And tapping into its power is as simple as turning on your radio.

Whether your choice is jazz, classical, rock 'n' roll, or hip-hop, music has unique effects on the brain, says Dr. Andrew Budson, a lecturer in neurology at Harvard Medical School and chief of cognitive and behavioral neurology at the VA Boston Healthcare System. And you can reap benefits whether you are playing a musical instrument or just kicking back and listening to some tunes.