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From Hear to There

Scott LaFee on

A small study suggests that older adults with hearing loss may also be less physically active. Researchers looked at nearly 300 adults, ages 60 to 69, and found that those with hearing loss reported nearly 35 minutes of more sedentary activity each day than those without hearing loss.

They also reported that the hearing-impaired had 30 fewer minutes of light physical activity and six fewer minutes of moderate to vigorous physical exercise each day.

The reasons may include a sense of social isolation and greater tendency for depression.

Immunity to Cellular Aging

So-called "natural killer T-cells" are among the immune system's primary fighters against foreign invaders such as bacteria and viruses. But new research suggests they might also be able to go after senescent cells, which are partly responsible for many diseases of aging. Senescent cells are cells that no longer divide, possibly due to DNA dysfunction, stress or internal damage.

Scientists identified a subset of natural killer cells and an accompanying protein that accumulates in fat cells in obese mice. When they activated the protein, it turned on the associated NK cells, which then worked to clear out senescent cells linked to the rodents' obesity.

 

One result: Insulin sensitivity improved, and metabolism levels started to return to normal.

Body of Knowledge

A newborn baby's vision isn't great, about 5% acuity of adults, but it improves quickly, and by six months old, babies can see about as well as grown-ups.

Get Me That, Stat!

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