Fossilized Teeth Hold Clues to Early Human Species' Diet

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Human Breast Milk May Block HIV, Mouse Study Finds

HealthDay – Thu, Jun 14, 2012 THURSDAY, June 14 (HealthDay News) -- Human breast milk seems to kill HIV and block its oral (through the mouth) transmission, according to a new study conducted in mice.

The findings suggest that it may be possible to isolate the compounds in breast milk that destroy HIV and use these to combat the virus that causes AIDS, the University of North Carolina (UNC) School of Medicine researchers said.

More than 15 percent of new HIV infections occur among children. Left untreated, only 65 percent of infected babies survive until their first birthday, and less than 50 percent reach the age of 2, the study authors pointed out in a news release from the University of North Carolina Health Care.

While breast-feeding by HIV-infected mothers is believed to cause a large number of HIV infections in infants, most breast-fed infants do not become infected, despite prolonged and repeated exposure to the virus, researchers have found.

In order to investigate this contradiction, the UNC researchers used humanized mice, which have a fully functioning human immune system and can be infected with HIV in the same manner as humans.

The mice did not become infected when given HIV in whole breast milk from women without HIV, according to the report published June 14 in the online journal PLoS Pathogens.

"This study provides significant insight into the amazing ability of breast milk to destroy HIV and prevent its transmission," senior author J. Victor Garcia, a professor of medicine in the UNC Center for Infectious Diseases and the UNC Center for AIDS Research, said in the news release.

The research could lead to new ways to prevent HIV transmission, the study authors suggested.

"No child should ever be infected with HIV because it is breast-fed. Breast-feeding provides critical nutrition and protection from other infections, especially where clean water for infant formula is scarce," Garcia said. "Understanding how HIV is transmitted to infants and children despite the protective effects of milk will help us close this important door to the spread of AIDS."

It is important to note that research conducted on animals does not necessarily produce the same results in humans.

More information

The New Mexico AIDS Education and Training Center has more about pregnancy and HIV/AIDS.

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Scientists Probe Diversity of Human Body's Microbes

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Overfed fruit flies develop insulin resistance; Represent new tool to study human diabetes

ScienceDaily (June 5, 2012) — Researchers find that fruit flies overloading on carbs and protein not only gain weight but have shortened life spans -- and develop insulin resistance, a hallmark of Type 2 human diabetes.

See Also:Health & MedicineDiabetesDiet and Weight LossObesityPlants & AnimalsMolecular BiologyCell BiologyAnimalsReferenceDiabetes mellitus type 2Blood sugarSouth Beach dietDiabetic diet

With Type 2 human diabetes climbing at alarming rates in the United States, researchers are seeking treatments for the disease, which has been linked to obesity and poor diet.

Now biologists at Southern Methodist University, Dallas, report they have developed a new tool that will help researchers better understand this deadly disease.

By manipulating the diets of healthy adult fruit flies, the researchers developed flies that are insulin-resistant, a hallmark of Type 2 diabetes.

Until now, researchers largely have relied on rats, mice and other animals as model systems for exploring the metabolic and genetic changes that take place in diabetics.

The fruit fly Drosophila melanogaster has been widely deployed in labs to investigate a wide range of human diseases, from Alzheimer's to cancer. But the scientific literature hasn't documented use of the adult fruit fly for studying the metabolic disruptions that are the hallmark of Type 2 diabetes. The fruit fly's advantages include its low cost and a very short lifespan, both of which enable scientists to undertake rapid screenings in their search for new genetic and drug treatments.

The insulin-resistant fruit fly was developed in the lab of SMU biologist Johannes H. Bauer, principal investigator for the study. It was accomplished by feeding fruit flies a diet high in nutrients, said Bauer, an assistant professor in SMU's Department of Biological Sciences. That process mimics one of the ways insulin resistance develops in humans -- overeating to the point of obesity.

The lab's insulin-resistant fruit flies now can serve as a highly relevant and efficient model for studying Type 2 diabetes.

"We learned that by manipulating the nutrients of fruit flies, we can make them insulin resistant," Bauer said. "With this insulin-resistant model we can now go in with pinpoint precision and study the molecular mechanisms of insulin resistance, as well as drug treatments for the condition, as well as how to treat obesity, how to block insulin resistance and how metabolic changes from a specific diet develop. The possibilities are endless."

The researchers reported their findings in the article "Development of diet-induced insulin resistance in adult Drosophila melanogaster," published in Biochimica et Biophysica Acta -- Molecular Basis of Disease.

Two overfeeding diets, carb and protein, both result in insulin resistance

Insulin, produced by the pancreas, is the hormone that tells our cells to absorb glucose, a necessary sugar molecule that provides our body, particularly the brain, with the energy to function, make repairs, move and grow.

In Type 2 diabetes, a person is insulin-resistant because his or her cells fail to respond to insulin's signal to absorb glucose. The disregulation of glucose upsets the body's delicate internal equilibrium, causing massive disruptions in normal cellular processes. These interruptions manifest in multiple disease symptoms, making Type 2 diabetes difficult to characterize, treat and cure.

To provide a good base model organism to study aspects of this complex disease, researchers in the Bauer lab wanted to determine whether flies develop diabetes-like metabolic changes when fed different diets. The researchers developed the insulin-resistant flies in two different ways: One group of fruit flies was overfed a carbohydrate-loaded diet; a second group of flies was overfed a protein-loaded diet. In both cases, the disruption had a profoundly detrimental effect on the flies' health and physiology.

SMU biologist Siti Nur Sarah Morris, lead author on the study, said the results the researchers observed were both expected and unexpected. The researchers expected the flies to gain weight, which they did. Carb-loaded flies gained excessive weight and got fat, just like humans who overeat sweets, french fries, pasta and ice cream. Protein-loaded flies also gained weight, but upon extreme overfeeding they lost weight, just like humans who follow the popular Atkins Diet, a weight loss program in which participants eat only meat, seafood and eggs.

The researchers expected the carb-loaded fruit flies to develop insulin resistance, which they did.

In a surprising result, however, the fruit flies that overate protein also developed insulin resistance, but at a quicker and more severe rate.

"Carb-loaded flies gain weight. Protein-loaded flies gain and then lose weight. So the two diets have exactly opposite effects on metabolism," Bauer said. "But too much of either one of them causes insulin resistance. That surprised us."

Overfed flies had shortened lifespans, differences in fertility

In other findings, carb-loaded flies experienced a profound decline in egg-laying, a measurement of fertility. In contrast, protein-loaded flies first experienced increased egg-laying, but the extreme diet led to decreased egg laying. Both diets led to shortened longevity, the scientists reported.

"The high-protein flies looked frail and unhealthy. They moved less, almost as if sedated," Morris said. "The fatter flies on the high-carb diet had massively decreased fertility; they flew less but still tried to move."

While both diets resulted in insulin resistance, differences were remarkable.

"The carb data imply a linear relationship between carb levels and health. The more carbs, the more weight, the more sugar storage and fat, the more insulin resistance and the less fertility," Bauer said. "But with protein, this relationship becomes parabolic, meaning all readouts go up, then come down again. The decreased storage we liken to a catabolic state that is primarily destructive for the body's optimum metabolic functioning, such as the ketosis typically seen in people eating Atkins-type diets."

Besides Morris and Bauer, other authors on the study were SMU students Claire Coogan, Khalil Chamseddin and Santharam Kolli. Other co-authors, from Pennington Biomedical Research Center, Baton Rouge, La., are Jeffrey N. Keller, director, Institute of Dementia Research & Prevention, and Sun Ok Fernandez-Kim. The research was funded by the National Institute on Aging.

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Every Human Is Different ! Plan Your Weight Control

A diet program that can help you lose the weight, that includes, vitamins, proteins, minerals.

You got to follow a realistic plan, which it won't create food cravings, or deprive what our bodies required to replenish.

As a personal thought! A have witness a great turn in organics supplements,which have help people lose weight, there are some weight management programs out there that go by your individual person. And they work just fine!

Because this programs don't deprive your body of the needed nourishment of micro-nutrients, or Macro-nutrients, at the same time they keep the diet fun by helping you with recipes that are easy to cook, and with an exercise plan that wont kill you.!

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'Iceman' Mummy Yields Oldest Human Blood Cells

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High court throws out human gene patents

The Supreme Court on Monday threw out a lower court ruling allowing human genes to be patented, a topic of enormous interest to cancer researchers, patients and drug makers.

The court overturned patents belonging to Myriad Genetics Inc. of Salt Lake City on two genes linked to increased risk of breast and ovarian cancer.

Myriad's BRACAnalysis test looks for mutations on the breast cancer predisposition gene, or BRCA. Those mutations are associated with much greater risks of breast and ovarian cancer.

The American Civil Liberties Union has been arguing that genes couldn't be patented, a position taken by a district court judge but overturned on appeal.

The justices' decision sends the case back down for a continuation of the battle between the scientists who believe that genes carrying the secrets of life should not be exploited for commercial gain and companies that argue that a patent is a reward for years of expensive research that moves science forward.

In 2010, a federal judge ruled that genes cannot be patented. U.S. District Judge Robert Sweet said he invalidated the patents because DNA's existence in an isolated form does not alter the fundamental quality of DNA as it exists in the body nor the information it encodes.

But last year, a divided panel of the federal appeals court in Washington that handles patent cases reversed Sweet's ruling. The appeals court said genes can be patented because the isolated DNA has a "markedly different chemical structure" from DNA within the body.

The Supreme Court threw out that decision, and sent the case back to the lower courts for rehearing. The high court said it sent the case back for rehearing because of its decision in another case last week saying that the laws of nature are unpatentable.

In that case, the court unanimously threw out patents on a Prometheus Laboratories, Inc., test that could help doctors set drug doses for autoimmune diseases like Crohn's disease.

"The question before us is whether the claims do significantly more than simply describe these natural relations," said Justice Stephen Breyer, who wrote the opinion in the Prometheus Laboratories case. "To put the matter more precisely, do the patent claims add enough to their statements of the correlations to allow the processes they describe to qualify as patent-eligible processes that apply natural law? We believe the answer to this question is no."

The U.S. Patent and Trademark Office has been awarding patents on human genes for almost 30 years.

Testing for mutations in the so-called BRCA genes has been around for just over a decade. Women with a faulty gene have a three to seven times greater risk of developing breast cancer and a higher risk of ovarian cancer.

Men can also carry a BRCA mutation, raising their risk of prostate, pancreatic and other types of cancer. The mutations are most common in people of eastern European Jewish descent.

Myriad Genetics Inc. sells the only BRCA gene test.

The case is Association for Molecular Pathology v. Myriad Genetics, 11-725.

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