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Between 1988-94 and 2005-06, the percentage of teens with hearing loss jumped by about a third, from 15% of 12-to-19-year-olds to 19.5%.

Diet and nutrition, as well as exposure to toxins, might be factors. Living in poverty is also associated with greater risk of hearing loss among youngsters, as children in lower-income families may not be getting adequate nutrition to support proper development of the auditory system.

Difficulty in hearing among youngsters has been linked to slower language development, poorer performance in school and lower self-esteem. And because social skills are dependent on language, previous studies have found that even slight hearing loss in elementary and high school students can result in progressively lower scores on communication tests and greater anxiety.

Most plastic products, from sippy cups to food wraps, can release chemicals that act like the sex hormone estrogen, according to a study in Environmental Health Perspectives. The study found these chemicals even in products that didn't contain BPA, a compound in certain plastics that's been widely criticized because it mimics estrogen.

The testing showed that more than 70 percent of the products released chemicals that acted like estrogen. And that was before they exposed the stuff to real-world conditions: simulated sunlight, dishwashing and microwaving, Bittner says.

Early reaction to the study was mixed. Some scientists wondered about the test's reliability. Others noted that wine and many vegetables also can act like estrogen. And a few observed that Bittner has a financial interest in the testing lab and in a company involved in making plastic products that don't release estrogenic chemicals.

Mitochondria, the cellular power plants that generate virtually all the energy your body requires, play a vital role in keeping organs youthful and healthy, too. So what can you do to keep those mitochondria powered up? Try reaching for the green -- like green pepper, green kiwifruit, and green parsley. Green-pigmented foods like these are rich in pyrroloquinoline quinone -- or PQQ for short -- a powerful antioxidant that shields mitochondria from oxidative damage in such vital organs as the brain and heart.

Dietary PQQ may not only shield these precious mitochondria from damage but also promote the formation of new mitochondria. Studies also suggest that PQQ may protect against neurological damage caused by the common environmental toxin methylmercury, which has been linked to Parkinson's and Alzheimer's disease

In addition to certain greens, a number of items in the native Japanese diet contain PQQ as well, including miso, tofu, and natto (soybean paste). Coldwater fish like salmon, sardines, and tuna also contain appreciable amounts of PQQ. Just choose wild rather than farmed fish -- and canned chunk-light tuna over albacore -- to avoid high levels of methylmercury.

Regular exercise could help prevent brain damage associated with neurodegenerative diseases like Alzheimer's, according to research published this month in Elsevier's journal Brain, Behavior, and Immunity. "Exercise allows the brain to rapidly produce chemicals that prevent damaging inflammation", said Professor Jean Harry, who led the study at the National Institute of Environmental Health Sciences in the United States. "This could help us develop a therapeutic approach for early intervention in preventing damage to the brain."

exercise before the onset of damage modifies the brain environment in such a way that the neurons are protected from severe insults.

exercise could be used to affect the path of many human conditions, such as neurodevelopmental disorders and neurodegenerative diseases. In addition, as a chemical model of neuronal damage was used, it also raises the possibility that exercise could offer protection against the potentially harmful effects of environmental toxins.