According to a new research, all diets – from Atkins to Weight Watchers – have similar results and people should simply pick the one they find easiest.
The study, published in the Journal of the American Medical Association, analyzed data from 48 separate trials.
The Canadian team concluded that sticking to a diet was more important than the diet itself.
Obesity experts said all diets cut calories to a similar level, which may explain the results.
Diets go in and out of fashion on a regular basis, with a current debate around the relative benefits of low carb and low fat diets.
Scientists at McMaster University in Ontario and the Hospital for Sick Children Research Institute in Toronto analyzed data from 7,286 overweight dieters.
The range of diets covered included, Atkins, South Beach, Zone, Biggest Loser, Jenny Craig, Nutrisystem, Volumetrics, Weight Watchers, Ornish and Rosemary Conley.
All diets have similar results and people should simply pick the one they find easiest
It showed that after 12 months, people on low carbohydrate and low fat diets both lost an average of 16lb. Those on low carb meal plans had lost slightly more at the six-month marker.
The report said: “The differences [between diets] were small and unlikely to be important to those seeking weight loss.”
It concluded: “Our findings should be reassuring to clinicians and the public that there is no need for a one-size-fits-all approach to dieting because many different diets appear to offer considerable weight loss benefits.
“Our findings suggest that patients may choose, among those associated with the largest weight loss, the diet that gives them the least challenges with adherence.”
However, the study did not look at wider health issues, such as levels of cholesterol, which may vary according to diet.
Prof. Susan Jebb, from the University of Oxford and a government advisor on obesity, said diets were more similar than they appeared, advocating cutting calories to 1,500 a day, sticking to strict meal times and avoiding biscuits, cakes and chocolate.
“The issue is about adherence and it’s how closely and how long can you keep sticking to the plan over time that matters.
“That probably means finding the right diet for you, rather than one being so particularly better than the others.”
Prof. Susan Jebb said people should try to match diets to their lives.
Vegetarians would struggle more with a high protein, low carb diet, while people living on their own may find liquid (instead of meals) diets easier than those who would still have to cook for a family.
Jessica Simpson has showed off her post-baby body once again in a new picture while working with Weight Watchers on November 8.
“Couldn’t stop smiling on set for my new @weightwatchers campaign today! #happy,” she wrote.
Jessica Simpson has showed off her post-baby body once again in a new picture while working with Weight Watchers
Jessica Simpson, 33, is seen wearing dark jeans, boots and a tight-fitting white button down top while standing in a field. The singer and designer smiled with her mouth wide open, and with her beautiful blonde locks down in waves.
Eric Johnson’s fiancée is so thrilled with her new slimmed down figure.
Jessica Simpson previously dropped 70 pounds after giving birth to Maxwell, 19 months, and has been dropping the weight once again since giving birth to son Ace in June.
Jessica Simpson began filming her next long-awaited advert for Weight Watchers on Thursday.
The singer is getting paid a reported $4 million to be the face of the diet program.
Jessica Simpson, 32, posted a sneak peek of her filming the advertisement on her Twitter account.
In the snap, Jessica Simpson is seen standing outside a gourmet market and is looking svelte in a pair of black figure-hugging trousers, a fitted blazer and sky-high heels.
“That’s a wrap on the @weightwatchers commercial!” she says in an accompanying caption.
Her former assistant and best friend CaCee Cobb, friend Erin Alexander and stylist Nicole Chavez also posed with the star for a behind-the-scenes happy snap.
In the photograph, Jessica Simpson is wearing a pair of jeans tucked into Ugg boots, a black vest top and a plaid shirt.
She look noticeably slimmer around the jawline and upper body.
Jessica Simpson’s first advert for the company was filmed back in July as she got stuck into her weight loss regime following the birth of baby Maxwell.
Yet the footage failed to capture her full figure, presumably the one thing that viewers want to see so that they can make a comparison between her before and after figure.
The advert instead focuses on Jessica Simpson’s upper body, with close-ups of her face.
“I’m Jessica Simpson and yes I’m doing Weight Watchers,” she tells the camera, smiling.
“There is a lot of pressure to lose weight but I’m not a supermodel. I’m just Jessica trying to eat real food in the real world and I really just wanna be healthy for my daughter.
“So I knew Weight Watchers was the only way to go. It’s working.
“I’m on my way and it feels amazing. Really I just wanna be a better version of myself.”
Jessica Simpson began filming her next long-awaited advert for Weight Watchers on Thursday
Talking on Katie Couric’s chat show not long after it was revealed, Jessica Simpson admitted that at the time she wasn’t comfortable revealing her whole frame.
Meanwhile, the filming of her newest commercial comes after Jessica Simpson’s unwavering dedication to her diet plan had apparently earlier this month hit a snag – with the stress of gay allegations about her father “derailing” her efforts.
Jessica Simpson was said to have lapsed from her Weight Watchers plan.
According to reports online, the singer was no longer sticking to the correct portion sizes, which had slowed her weight loss.
“Jessica’s diet has been seriously derailed ever since the gay allegations against her father were released,” a source told RadarOnline.
While she’s not diverting from the diet, Jessica Simpson isn’t sticking to the portion plan and isn’t losing as much weight as she should.
“She knows that as the Weight Watchers spokesperson she has to be more disciplined, but her emotions are all over the place right now.”
It has certainly been a tumultuous few months for Jessica Simpson’s family.
Her parents Tina and Joe Simpson recently revealed they had filed for divorce after 34 years of marriage.
Jessica Simpson was spotted leaving the gym again yesterday and her sessions are clearly paying off.
As she approached her car, Jessica Simpson, 31, showed off her entire body for the first time since giving birth last month and she definitely looked slimmer.
The singer has quietly been working up a sweat, sticking religiously to her workout regime in a bid to shift her post-pregnancy pounds.
Wearing an all black gym outfit that consisted of leggings, a tracksuit top and trainers, she seemed eager to get into her waiting car and head home to her child.
It’s not the first time that Jessica Simpson has been seen leaving a private gym in Los Angeles as earlier this week she was spotted finishing another workout.
Jessica Simpson gave birth to her first child with her fiancé, former NFL star Eric Johnson, on May 1.
Jessica Simpson showed off her entire body for the first time since giving birth last month and she definitely looked slimmer
Beaming after the birth of the couple’s daughter, Maxwell Drew, Jessica Simpson looked radiant in the passenger seat of a Range Rover as a female friend took the wheel.
She paired black stretch workout wear with a leopard scarf, her wavy blonde locks falling around her shoulders.
Jessica Simpson was spotted publicly for the first time since giving birth last Wednesday as she arrived to Harley Pasternak’s gym in West Hollywood, where she has been undergoing her workout sessions.
The singer was also seen arriving to the fitness centre on Friday.
It was announced last week that Jessica Simpson, who reportedly gained 80 lbs while pregnant, would front the latest Weight Watchers campaign.
However, the singer was unable to start working out for several weeks on doctor’s orders due to having a C-section.
Appearing to have been given the all-clear, Jessica Simpson is now combining a new exercise regime with a healthy eating plan she had already kicked off.
Jessica Simpson spoke to People, in which she appeared in a photoshoot with daughter Maxwell and Eric, revealing she is eating protein-packed means and drinking home-mixed juices to help shed pounds.
Her dietary restrictions come after she was forced to deny on several occasions that she was having twins because of the size of her baby bump, which appeared to grow larger than average.
However, Jessica Simpson said in March doctors put her blooming figure down to the fact that she had excess amniotic fluid.
Now, the singer says she is anxious to shed her baby weight.
Jessica Simpson told People: “After you have your baby it’s like, <<Oh my God, what happened to my body… this is not me>>.”
The singer also revealed she planned to join Weight Watchers before she learned she was pregnant, having dealt with years of yo-yo dieting.
Jessica Simpson said she simply wants to feel comfortable in her skin again.
Jessica Simpson was officially announced as the new face of Weight Watchers as she is on a mission to get back in shape after giving birth a month ago.
Jessica Simpson, 31, is the new North America ambassador for the points-based weight loss programme and joins the likes of Jennifer Hudson, who also fronts campaigns for the brand.
The former singer will trade “yo-yo dieting for a healthier lifestyle”, according to a Weight Watchers spokesman.
Jessica Simpson has already started on a healthy eating regime – although she is not yet able to exercise on doctor’s orders until she fully recovers from her C-section.
She spoke to the new edition of People magazine, in which she appears in a photoshoot with daughter Maxwell Drew and fiancé Eric Johnson.
Jessica Simpson revealed she is eating simple meals, including shrimp with sautéed spring vegetables and quinoa.
She is also drinking home-mixed juices, her favorite being kale, spinach, apple, ginger, romaine, celery and carrot combo.
Jessica Simpson was officially announced as the new face of Weight Watchers as she is on a mission to get back in shape after giving birth a month ago
Talking about how she is anxious to shed her baby weight, Jessica Simpson told People magazine: “After you have your baby it’s like, <<Oh my God, what happened to my body… this is not me>>.”
Jessica Simpson revealed she planned to join Weight Watchers before she learned she was pregnant.
Her weight has yo-yoed over the years and she is keen to feel comfortable in her skin again.
She went on: “It would be nice to feel comfortable in a bikini, but that’s not my goal. I just want to fit into jeans.”
While Jessica Simpson is not allowed to exercise yet, she admits she has failed in keeping her hands off her future husband, former NFL star Eric Johnson, 32.
“I’ve kind of broken one rule,” Jessica Simpson confessed about not being able to abstain from sex.
“I think I have the sexiest man in the world. So that’s the rule I break.”
Elsewhere in the interview – which featured the first photos of baby Maxwell Drew who was born on May 1 weighing 9lb 13oz – Jessica Simpson said she gets withdrawal symptoms when she’s not breastfeeding her daughter.
She said: “It’s become a full-on job. It’s the worst if I have to pump and give Eric a bottle to give her. I miss holding her and having that closeness.”
Since becoming parents, Jessica Simpson admits her and Eric Johnson’s lives have changed completely.
“Life has completely changed. From how I sleep to what I think about, Maxwell has definitely taken over everything!
“We stare at her all the time. We can’t get enough.”
The couple also has wedding plans to think about, and may wed by the end of the year, although Jessica Simpson says they have still not set a date.
She added: “I want to feel really great in a wedding dress,” which will no doubt giving her inspiration in her new Weight Watchers mission.