This week in health news from Scott LaFee of the Sanford Burnham Prebys research institute
Humans aren’t the only animals aware of mortality. Elephants are known to grieve their dead. Crows conduct a sort of funeral for lost flock. Communal insects like bees, ants and termites designate only certain members of the colony to be six-legged morticians.
Add to this list fruit flies which, in newly publicized research, apparently experience a shortened lifespan if they are exposed to the corpses of dead fruit flies.Researchers at the University of Michigan found that when healthy fruit flies saw dead fruit flies, they were inexplicably shunned by other flies. More fundamentally, the death-exposed flies quickly lost their stored fat and died sooner than their nontraumatized counterparts, according to The New York Times.
The reasons aren’t fully understood, but one hypothesis suggests that the flies who see dead flies take them as a danger signal, and so divert more energy into reproduction at the expense of longevity.The human body is approximately 60 percent water — a little more for men, a little less for women, who typically have more hydrophobic fat content. Some of that water is used to produce a variety of bodily fluids and secretions.
Some are pretty obvious, such as blood and urine, but others less so, though you can’t live without them , like pus, mucus, bile, cerumen , sebum , smegma and rheum, the watery discharge from eyes that congeals as the gunk found at the corners when you wake up, euphemistically known as “sleep” or “dozy dust,” less euphemistically as “eye boogers.
What’s the connection? In mouse studies, researchers found that an enzyme in K. aerogenes’ genome degrades the ovarian hormone estradiol and that lower levels of estradiol are associated with higher rates of depression in women.The mouse findings haven’t been reproduced yet in humans, but they suggest another possible therapeutic target for treating depression.
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