Why are they smiling . First the night line five. Constipated . Trust dulcolax. Dulcolax, designed for dependable relief. How much protein does your dog food have . 20 . Support your active dogs whole body health with purina 1. Number one, in just 60 seconds. We start with news from the world of weight loss. Scientists followed contestants from the biggest loser. They found when the cameras went on. There are hard and surprising findings about our bodies. Heres Lindsey Davis. Reporter it was a recordbreaking moment. After shedding an astonishing 239 pounds, danny cay hill became the contestant to lose the most weight ever on the biggest loser kwth. He went home with a quarter Million Dollars literally half the man he used to be. Your starting weight is 430 pounds. But it was what came after the afterphotos that proved the biggest shock to danny and many of the other contestants. I didnt want anybody to know i was on the biggest loser. I didnt look like that anymore. Reporter little did they know their metabolism dropped. What would turn out to be a setback for theaj contestants would prove to be a breakthrough to understanding why so many dieters struggle to keep off the weight they lose. In a new study that has everybody talking, scientists followed 14 of the 16 contestants from season 8 to the biggest loser kwth. Monitoring them for six years after the show. All but one gained some of the weight back. Four of them reported being heavier now than at the beginning of the show 123467 . When you attempt to fight your body weight, your biology will fight back. Reporter this scientist says while they had a normal metabolism at the start. Years after their metabolism slowed down. A mechanism he says the body uses to return to the original weight. Your bodys Metabolic Rate will slow down. The number of calories you need is going to decrease. That makes it difficult for y are you ready . Yeah. Reporter huge implications at a time when were inundated with weight loss shows and celebrities going public with their struggles. I have eaten bread every single day. Reporter struggles that six years later danny continues to face. Ive had people look at me and tell me i ought to be ashamed of myself. I ought to walk around the block a few times. Reporter as the winner he felt he also had the most to lose. 430 pounds before the show, 191 pounds right after. And since then hes gained back more than 100 pounds. Was this sustainable the weight loss that you had . Its not at all. When i went to the ranch i was there for 90 days. I quit my job. Thats why i won the show and thats why i did what i did. I made it my job. But were finding out that in order for us to keep our calorie burn at the same rate of a to work out two hours a day. Reporter he says in order to maintain his current 295 pounds, he has to eat 800 calories less than a typical man his size. I started eating like a normal man would to be even. And i wasnt staying even, and that was what was dishartening, and i heard this from all the biggest loser contestants. Its difficult to keep weight off because your body doesnt want to do it and your desire to eat increases. Its the perfect storm for weight regain. Reporter it might explain why there were plummeting levels of leptin among contestants. I kind of failed, here i went on national tv and became this person for people to look up to and now ive gained this weight. Reporter she was also part of the study. She was 248 pounds before the show. And now back to 204 pounds. She says the results of study have helped her understand why its taken so much effort to maintain her ideal weight. I have no idea what its going to be like in 15 years as my metabolism continues to slow. I guess thats what im afraid of. Reporter a fear thats led her to question her decision to join the show in the first place. Had i known what i know today, i probably would have not done the show. Reporter but the creator of the biggest loser kwth defends his show. When people leave their show theyre better off than being 400 pounds. I think the study could have done things a little differently. I would like them to take 14 people who kept the weight off. Reporter he said the studies may have unintended negative results. Any time you tell somebody its not them, its something else, it gives them kind of a way to excuse the fact really want to eat that. Reporter he says for him and many others its helped relieve some of the crushing shame that came from the weight gain. Ive heard from obese people all over facebook and twitter, everybody is messaging me going i knew this was going on. This makes me feel better about where i am. Not an excuse, but at least some of the shame is lifted and now we say where do we go from here. Reporter one of dannys closest friends on the show, 26yearold amanda. Its great the world knows that biggest loser contestants, we arent lazy and didnt waste an opportunity and were not just gaining weight back. Reporter over the course of the season she lost 87 pounds. Since the show wrapped seven years ago shes now gained back 12 of those pounds. Giving hope to many that weight loss can sometimes be maintained. And joining a list of celebrities who have with weight loss that appears to be permanent, but she says its a difficult daily struggle. To maintain my weight, i have to eat less than 1400 calories a day. Its almost nothing. Im not full off that much. And i find myself in a constant, well, maybe i shouldnt eat right now, and it is almost like an eating disorder in way. Its like i have to restrict everything i do. Reporter like danny, she breathed a sigh of relief when the most recent study was released. Finally an explanation for her struggle. Shes concerned about the long term ramifications. No. Now i know im burning 600 calories less per day than i was six years ago. What does the future hold for me . Its like am i going to gain the weight back . Is my destiny going to be an over weight woman because my most important motivational tools is of all things instagram. Ive made sure that i go on social media a lot. I have over 83,000 followers on instagram. I want to be as real as i can with people. I found that going that keeps me accountable. Reporter tonight add to that one and a half million nightline viewers. But no pressure. Im Lindsey Davis in new york. Up next, it turns out there may be a deeper meaning behind Janet Jacksons new song dam baby. If shes pregnant at 49, how did that happen and can it work for you . Unless you have allergies. Flonase is the first and only nasal spray approved to relieve both itchy, watery eyes and congestion. No other nasal allergy spray can say that. Go ahead, embrace those beautiful moments. Flonase changes everything. 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Go to facebook. Com, dawn saves wildlife. The tv show good times. Then she made her name as miss jackson if youre nasty, and now we may be watching her at about 50 to become a mom. Her new single says it all. Janet jackson may be expecting her first child with her husband, a businessman. According to a report by entertainment tonight and other outlets. Just shy of her 50th birthday, the superstar postponed her unbreakable world tour last month. Surprising fans with this twitter post. And there has been a sudden change. I thought it was important that you be the first my husband and i are planning our family. So im going to have to delay the tour. Please, if you can try and understand that its important that i do this now, i have to rest up. Reporter the tour, part of jacksons long awaited comeback releasing new music for the First Time Since 2010. And winning the ultimate icon award at last years bet awards. My heart is so full. Reporter how are you feeling right now . Im very well, thank you. When it comes to family, janet has taken a hands on role in the lives of her brother, michaels children. I want to say i love him so much. Reporter publicly comforting one of them at a memorial. As for having her own children, the star saying after her brothers death it would be very sweet if i did have children. The icing on reporter but with her nearly 50 years old, getting pregnant is challenging. A spontaneous natural pregnancy in a 50yearold woman is almost unheard of. Its not that it never happens, but its incredibly rare. Its either the use of donor egg or the womans own egg that she had frozen years before. Reporter janet wouldnt be the first celebrity to start a family later in life. Halle berry showing off her baby bump at age 46. And always be my baby singer mariah carey opened up with her struggles about infertility. Did you have fertility treatments to try to get pregnant . The main thing i tough, and that was to go on progesterone every month. And then when i was pregnant i had to stay with the progesterone for ten weeks. It minimizes the chance of miscarriage by 50 . Reporter she eventually gave birth to healthy twins at age 4 the. And then theres celine who talked about her miscarriage and her ivf atechlts. For me to share this, its about bonding with other women going through the same thing. Reporter ivf is costly. It costs an average of about 13,000, not including the medication which can cost up to 5,000 more. A hefty price tag for most american women. In the united states, most of the assistive insurance. Reporter Janet Jackson has yet to comment on the reports of pregnancy and if so, how. We may never know. Theres really not a lot that i or anyone else really knows. She likes to keep a low profile. Women who are celebrities becoming pregnant or having babies in their late 40s or 50, i think the concern is it tends to only provide a glimpse into their situation. Reporter with more women delaying childbirth, the fertility industry is booming, now worth 4 billion. An Egg Donor Program advertising accomplished donors to hopeful couples. The premier donors get higher fee, its based on education, s. A. T. Scores. When we put up a beautiful donor qualities, we get calls immediately. I call it the immediating frenzy. And Companies Like egg banks, throwing cocktail parties appealing to career women hoping to extend the biological clock. Will you marry me . Absolutely. Reporter this 29yearold says she found the love of her life on the bachelor. Were going to make some babies. Reporter but two years earlier the fertility nurse decided to freeze her eggs just in case. Its a huge sense of relief. I felt it would be silly for me not to take the opportunity when it was handed to me. Reporter but they worry that women arent hearing enough about the risk of taking drugs to stimulus their ovaries. Thats part of the procedure. I would like to see clarity about what it means to go under your body. There are risks. Reporter and if a woman cant carry her child, a surrogate may give hope. This 40yearold endured six rounds of ivf and two miscarriages with no luck. There was nothing i could do of myself to make my body do this, to become pregnant. There was depletion financially and emotionally. It felt tough. Reporter and the cost of a surrogate would be even more, up to 100,000. But luckily for sara, her 61yearold mother stepped in to help. How would that possibly happen . No offense, but who would do that and what doctor would let them . We kept thinking we were going to be stopped. Nine months pregnant, 38 and a half weeks. Becoming a surrogate and giving birth to her own grandson. How are you doing . Reporter the road to mother hood later in life isnt always easy. Reporter for Janet Jackson, millions of fans tonight wondering if shell be trading anthems like thats the way love goes for quiet lullabys some day soon. Next, the airline that turned being seated next to a crying baby into something to celebrate. Ill be right back. Be good. Text mom. Boys have been really good today. Send. Lets get mark his own cell phone. Nice. Send. Brad could use a new bike. Send. [google ] message. You decide. Theyre your kids. Why are you guys texting grandma . Keep your family connected. Appconnect. On the newly redesigned passat. From volkswagen. Bill assumed his mayo was the best choice. Assume nothing. Unlike hellmanns regular mayo, kraft Olive Oil Mayo has half the fat and still has great flavor. No wonder it tastes so good. Your heart loves omega3s. But theres a difference between the omega3s in fish oil and those in megared krill oil. Unlike fish oil, megared is easily absorbed by your body. Which makes your heart, well, megahappy. Happier still, megared is proven to increase omega3 levels in 30 days. Megared. The difference is easy to absorb. Try cool mint zantac. Hey, need fast heartburn relief . It releases a cooling sensation in your mouth and throat. Zantac works in as little nexium can take 24 hours. Try cool mint zantac. No pill relieves heartburn faster. I will admit that even though i have a oneyearold at home, when i get on a plane and realize theres a baby nearby, i often feel unhappy and judgmentl. Why are the people youre about to see smiling, then . Jet blue followed these moms as they flew across the country with their little ones. I dont want to be that ly with the baby who is screaming for four hours. Im most nervous about everyone around us wishing we werent in the plane. The airline gaining fans with the newly released mothers david owe going viral. The campaign addressing the Worst Nightmare of traveling next to a screaming baby. Welcome abard our special jet blue flight. We know it can be hard on all of us. Every time a baby cried passengers aboard this flight received 25 off their next trip. In other words, four cries equals one free round trip ticket. By the end of the video, the baby is earning a round of applause and everybody on board a free round trip. Thanks again to all the moms and the babies on board today for making this flight to special. If they gave me free tickets, i would adjust my attitude as well. Thank you for tuning in tonight. As always, were online 24 7 at abcnews. Com. Thank you for watching. Good night. Debra, what the hell happened to my dictionary . Oh, yeah, ray. Im sorry. I was gonna tell ya. I caught the boys sliding down the stairs on it. Oh, come on. Its ruined. Look at this. The leather bindings all comin off the. Pages are missin, the covers comin off it. Calm down, ray. Its just a dictionary. Its not just a dictionary, robert, all right . I won this in the seventh grade spelling bee. Ah, another one of raymonds triumphs. Seventh grade spelling. Gosh, what word put you over the top, raymond . Boat . For your information, i had to spell vacuum. Okay . Two us. Or two cs. I dont know cause theres no v in here. Hehhehhehheh. What goes around comes around, huh, ray . What do you mean . Just like when you ruined my jazz records. Oh, all right. Dad, we all know the story, okay, so not again. Why not . Its a short story. Once upon a time, i had great jazz records. You were born, now i dont. All right you been on me for this for over 30 years. I believe it was the winter of 69