Low fat? Low carb? Vegan? Crash diets? Diet soda? Exercise? What's the most effective way to lose weight? Here's a look at what 2014's weight loss studies showed us, including one cautionary tale for all dieters.
The diet battle of the year
What's better, low carb or low fat for weight loss? A meta-analysis published in JAMA in September suggested: Oh, heck, just follow a regimen. Though low carb very slightly outclassed low fat for weight loss over a course of months, the differences were minimal, and both approaches worked.
Low-carb dieters trump low-fat eaters, at least in this study
But another study, published the same month in the Annals of Internal Medicine, found that low-carb dieters fared much better than those who followed a low-fat diet and showed better results on blood tests that indicate cardiovascular health. This study by
Love carbs and (living) animals?
In case the confusion level isn’t higher than your carb intake by now, a
Crash diets polish their image
You’ll see this over and over; no matter what scientists find, the belief persists. But once again this year, a correlational study suggests crash diets might be more successful than the slow-and-steady sort. The October study in the Lancet
Diet more important than aerobics?
Another study cast doubt on a widely held belief about weight loss -- that aerobic exercise is important to the effort. Research at
More sad news about obesity
This one won't surprise anyone. The U.S. Centers for Disease Control and Prevention reported in October that depression and obesity are strongly linked, and the worse the depression, the worse the obesity (or possibly the other way around.)
Good news/bad news about gastric bypass surgery
For those who choose more aggressive paths to weight loss, an October JAMA Surgery study found that patients who underwent gastric bypass surgery lost more weight than those who chose gastric banding. However, the bypass group suffered more complications, including blood clots in the legs and lungs.
Breakfast may not be the most important meal of the day
Contrary to popular belief and the lectures of who knows how many mothers, breakfast doesn’t appear to be the most important meal of the day, at least when it comes to weight loss, according to
Diet sodas may not be the best option for dieters
We heard plenty during 2014 about the empty calories we consume in sugary sodas without even feeling fuller from all that intake, but one of the more controversial questions has been whether diet sodas are healthier for people. There are studies on both sides, but one of the most intriguing pieces of research -- conducted on mice -- says it might depend on the individual. The study found that unlike sugary sodas, artificial sweeteners change gut bacteria in ways that affect how we digest and metabolize food. And those changes might make some people more prone to weight gain and diabetes. Remember that these are results on mice fed large amounts of artificial sweetener, not on humans who drink a can or two of diet soda a day, but, as the researchers said, the results call for a closer examination of how artificial sweeteners act on the human body and on weight loss.
The most important weight-loss research news
Perhaps the most important weight-loss research news of all is the item that reminds us to be skeptical of studies (perhaps especially when they're touted by Dr. Oz), to look for studies that appear in respected publications, be aware of who's funding the study and what they might have to gain from it, and even when it comes to the best-conducted research, to remember that weight-loss studies are usually just adding pieces to a complex and largely incomplete picture of how weight is gained and lost -- they are not a signal to adopt one change after another based on a single finding.
In October, researchers retracted a previously published study that purported to find that pills made from green coffee beans led to remarkable weight loss.
The study was conducted in India and funded by a company called Applied Food Sciences -- which sells the pills. But it was written and published by two professors at the University of Scranton who were hired by Applied Food Sciences. The coffee-bean phenomenon fell apart after the Federal Trade Commission brought forth evidence of falsified information in the study -- and after U.S. consumers spent hefty sums on a product not known to have any weight-loss usefulness. Shame on the company, the researchers, the professors who allowed their reputations and that of their university be hired out for bucks, and of course on Dr. Oz. And thanks to smart and aggressive regulators who knew when to step in.
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