Hemera/ThinkstockBy DR. JENNIFER ASHTON, ABC News Senior Medical Contributor

There are plenty of fad diets out there and tips for shedding pounds. But have you ever considered freezing yourself skinny?

When we are exposed to cold, our body produces something called “brown fat” that stimulates our metabolism. This has some people turning to “cold dieting” to shed some pounds.

One such device called the KryoLife chamber uses air cooled by nitrogen gas to create a dry, negative 254-degree environment. But when does boosting your metabolism turn into hypothermia or worse?

In my studies in nutrition and obesity medicine, I have found that the bulk of available high quality evidence supports one fact: There is no quick fix for weight loss. So if you’re considering the use of a cryotherapy chamber, consult your doctor beforehand.

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Frederick M. Brown/Getty Images(NEW YORK) — Jack Osbourne was diagnosed with multiple sclerosis three years ago, and in that time he has hosted a paranormal investigation TV show, competed on Dancing With the Stars and had two children.

Today, the 29-year-old will appear in a new animated video to dispel myths about MS, an incurable autoimmune disease that affects the brain and spinal cord. The video is part of his ongoing “You Don’t Know Jack About MS” awareness campaign with pharmaceutical company Teva Neuroscience.

In the video, cartoon versions of Jack and a doctor travel through the human body to discover what causes the symptoms of RRMS, or relapsing remitting MS. Osborne has this type of the disease.

Speaking to ABC’s Sara Haines about the “You Don’t Know Jack About MS” campaign, Osbourne said it was born out of necessity.

“When I got diagnosed, you know I’d go online and you go to certain medical websites, and this and that. I really couldn’t find anything that was just a real clean concise, consistent message about — here’s MS, here’s what it is, here’s some information on how to kind of take care of yourself, and here’s some people’s experience,” he said.

Haines asked him about the biggest myth about MS.

“I mean, there’s so many,” he said. “Probably the biggest myth that I get frustrated by is that, you know, I think people automatically assume that you’re no longer able-bodied.

“And you know, there are so many symptoms to MS and that’s what makes it such a difficult disease to kind of tackle because you know, if someone might be the exact same age as me get diagnosed the exact same day but our symptoms be completely different.”

The MS was a motivator for his fierce competitiveness on Dancing With the Stars.

“I went in it being like ‘Hey, you know what, I’m going to do this. I’m going to kind of prove a point,’” he said. “You know … when I’m asked what we are capable of doing, what everyone else can do and, you know, trying to break down some of the stigmas associated with it.”

Asked about his current health situation, Osbourne said he wasn’t “experiencing any continuing symptoms as it stands right now.”

Osbourne and his wife, Lisa Stelly, welcomed daughter Andy Rose, in June. Their first child, daughter Pearl Clementine, was born in 2012.

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diego_cervo/iStock/Thinkstock(NEW YORK) — A new study estimates that dietary supplements cause 23,000 emergency department visits each year among Americans.

According to the research, published in the New England Journal of Medicine, the U.S. Centers for Disease Control and Prevention believe up to 23,000 emergency room visits annually could be brought on by adverse effects of dietary supplements. Further, the study finds that the same events lead to more than 2,000 hospitalizations per year.

Many of the hospitalizations, about 28 percent according to the study, involve young adults between the ages of 20 and 34.

Researchers said that taking out the case involving children, largely involving unsupervised ingestion, about two-thirds of the emergency room visits were related to herbal or complementary nutritional products, many of which are used for weight loss or energy. Those products can often lead to heart palpitations, rhythm disturbances and/or chest pain.

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kanoksak Detboon.iStock/Thinkstock(NEW YORK) — A preliminary medical study has found the fragments of the Ebola virus could persist in the semen of some survivors for up to nine months.

The report, published Wednesday in the New England Journal of Medicine, contains the initial results of a long-term study being run in partnership by the Sierra Leone Ministry of Health and Sanitation, the World Health Organization and the U.S. Centers for Disease Control and Prevention. The initial stages of the study focused on how long the virus could last in survivors’ semen because of past evidence that the viral fragments could persist in semen.

“These results come at a critically important time, reminding us that while Ebola case numbers continue to plummet, Ebola survivors and their families continue to struggle with the effects of the disease,” said Bruce Aylward, WHO Director-General’s Special Representative on the Ebola Response. “This study provides further evidence that survivors need continued, substantial support for the next six to 12 months to meet these challenges and to ensure their partners are not exposed to potential virus.”

Nearly 100 male study participants were enrolled between two and ten months after their illness began. Each provided a semen sample used to detect presence of genetic material linked to the Ebola virus.

All men tested within the first three months of the illness were found to have genetic material linked to Ebola in their semen. More than half of those tested between four and sixth months into the disease were found to have such material, while about 26 percent of those tested seven to nine months in were found to test positive.

It was not clear, researchers said, why some study participants had cleared the fragments of the virus from their semen earlier than others. Additional testing was being done to determine whether the viral fragments were live and/or potentially infectious.

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DigitalVision/Thinkstock(SEATTLE) — A Washington state couple is preparing for the birth of their second twin — months after the first twin was born in September.

Nick and Holli Gorveatt welcomed their son Lincoln on Sept. 29, according to officials from the Evergreen Health Medical Center. Born at 23 weeks, the infant is so fragile that his parents are still unable to hold him.

“It’s very surreal to be post-partum and pre-partum,” Holli Gorveatt told ABC News’ Seattle affiliate KOMO-TV.

Holli Gorveatt originally arrived at the hospital in Kirkland, Washington, after the twins showed signs of a condition in utero called “twin to twin” syndrome. In that case, one twin draws blood from the other in utero. The condition can leave both twins sick, with one becoming bloated and the other becoming weakened without enough blood supply.

Dr. Martin Walker, director of fetal medicine at Evergreen Health Medical Center, said that without treatment, the syndrome is fatal in 90 percent of cases. While the surgery went well, there was another complication days later. The pressure from the twins put too much pressure on Gorveatt’s cervix, and the amniotic sac for Lincoln was unable to be contained, Walker said.

As a result of the pressure, Walker and his team were forced to deliver Lincoln at 23 weeks, right at the edge of viability.

“These tiny, tiny babies are very fragile,” Walker told ABC News.

Lincoln is so small that he cannot eat without specialized help and cannot even be picked up by his parents, who have to view him in the incubator.

After Lincoln was born, Walker said he realized that the pressure had been relieved and that it was possible to stop Gorveatt from delivering her second son by manually closing the cervix. Due to the procedure to stop “twin to twin” syndrome, the second twin Logan could remain healthy in utero, Walker said.

“If she had gone into … full-on labor, there is not much we could have done,” Walker explained.

By stopping Gorveatt from delivering her second son, the team could give Logan a better chance at avoiding severe complications from premature birth, including bleeding in the brain. An infant born at 23 weeks has just a 10 percent chance at normal development, Walker noted. If Logan was delivered this week, now at 25 weeks, we would have a 50 percent chance at normal development.

While the team hopes to have Logan delivered at full term, Walker said his odds for survival increase tremendously each day he remains in the womb.

“He will be bigger [than his brother], growth in utero is so much better than growth in the [neonatal intensive care unit],” he said.

Holli Gorveatt said she can already tell that Logan is doing well.

“Logan’s good, so he’s growing a lot and he’s just kicking. He’s got fluid, he can move around. He was stuck before,” she told KOMO-TV.

Gorveatt will probably remain at the hospital until she delivers Logan, Walker said.

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Picturegarden/Getty Images(PLANO, Texas) — The Boyce family from Plano, Texas, shares a love of video games, the outdoors and one big bed.

Parents Tom and Elizabeth say they turned to co-sleeping with their five children, ages 1 to 11, when bedtime became filled with fights and tears.

To make the new situation work, the family went to Ikea, bought two beds and turned them into one sleeping area.

Courtesy Elizabeth Boyce“I kind of felt silly because it’s so simple,” Elizabeth Boyce told Good Morning America.

“I wanted to make sure each kid had a little, you know, like some space of their own,” Boyce said. “We hung a little curtain and did little mood lighting, you know, just made it fun.”

Elizabeth and her husband Tom said they began co-sleeping as a family about six months ago.

Sleep experts say co-sleeping can work, as long as everyone is getting enough sleep.

“I do think it’s important for a family who is co-sleeping to have a reassessment every couple of months to make sure that it’s still working for you [and] to make sure that everybody is sleeping well that you’re getting your couple connect time,” said Jennifer Waldburger, co-author of The Sleepeasy Solution: The Exhausted Parent’s Guide to Getting Your Child to Sleep From Birth to Age 5.

Speaking of mom and dad’s alone time, the couple said they aren’t too worried about “that part.”

“There are other rooms in the house,” Tom Boyd said. “They [the kids]can come and go anytime they want, but as long as it’s working well and they’re getting the sleep they need, then we’re not going to change it.”

The Boyces said since their new arrangement, the whole family has never slept better.

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iStock/ThinkstockBy DR. JENNIFER ASHTON, ABC News Senior Medical Contributor

Before buying a tube of lipstick or mascara, many women like to test out products to find the one that best suits them. But could those makeup samples make you sick?

My advice: Leave the testers alone. Whether it’s a high-end or a low-end discount store, you just don’t know who’s had their fingers or mouths on that makeup.

As far as the makeup you already have at home, most guidelines recommend tossing your mascara after three months, your lipstick after a year and powders or blushes after two years.

So while it could be costly and hard to part with some of your old favorites, it’s better to be safe than sorry.

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TongRo Images/Thinkstock(NEW YORK) — Researchers at Cambridge University’s Medical Research Council (MRC) Epidemiology Unit have revealed that babies born in the summer tend to be heavier at birth, and grow into taller, healthier adults.

Also according to the U.K.-based study, which was published in the medical journal Heliyon, female babies born in June, July and August also started puberty later in life, which is often an indicator of better health in their adult lives.

The researchers admit more study is needed, but posit the better birth weight could be attributed to the mothers of summer babies absorbing more Vitamin D due to summer sun exposure.

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Jason Merritt/Getty Images(NEW YORK) — Hayden Panettiere has been outspoken about suffering from postpartum depression since the birth of her daughter Kaya last December. Now, she’s seeking help to overcome it.

“Hayden Panettiere is voluntarily seeking professional help at a treatment center as she is currently battling postpartum depression,” her rep confirms in a statement. “She asks that the media respect her privacy during this time.”

During an appearance on Live! with Kelly and Michael last month, Hayden addressed her struggles. “It’s something a lot of women experience. When [you’re told] about postpartum depression you think it’s ‘I feel negative feelings towards my child, I want to injure or hurt my child.’ I’ve never, ever had those feelings,” she said. “Some women do. But you don’t realize how broad of a spectrum you can really experience that on. It’s something that needs to be talked about. Women need to know that they’re not alone, and that it does heal.”

Hayden’s character on Nashville, Juliette Barnes, is also suffering from postpartum depression on the show.

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iStock/Thinkstock(PARIS) — U.S.A. is Number One! — at least when it comes to being fat. The Organization for Economic Cooperation and Development has released its “How’s Life 2015?” survey on Tuesday, and the United States tips the scales — literally — when it comes to obesity.

The annual study of the personal and economic health of countries revealed that the U.S. has the highest obesity rate — 35% — topping the populations of Europe, South America, and much of Asia. By comparison, Italy’s obesity rate is around 10 percent, while Japan’s is a svelte 4%.

Despite efforts by first lady Michelle Obama and others to get Uncle Sam to slim down, the U.S. obesity rate actually jumped since 2000, the study revealed.

On a not surprisingly related note, the U.S. also has the fattest children, and most unwell teens.

Americans also suffer from a poor work-life balance, and experience a higher rate of deaths due to assault than many other nations in the report.

All isn’t too bleak, however: the U.S. tops the list in terms of personal wealth, Americans have more rooms in the average home, and spend more time with their children than do parents in most other OECD countries.

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