A lot of us fall back on dieting apps to make staying in shape easier but new research has revealed that often, they just don't work.

One of the main reasons is because they often fail to provide motivational support and tips on changing behaviour.

A study into 30 of the most popular diet apps, which can be downloaded on to portable devices such as smartphones and tablets, found most included few or no behavioural weight-loss strategies.

diet phone

Researchers in America also discovered that free apps were just as useful as premium downloads.

Weight loss expert Sherry Pagoto, associate professor of medicine at the University of Massachusetts Medical School, said: "Apps do include evidence-based behavioural strategies, but only a narrow range.

"Strategies that often were missing are ones that help patients with adherence and motivation."

Behavioural weight-loss strategies that are evidence-based - meaning they have been scientifically researched and found to be effective - include stimulus willpower control, problem solving, stress reduction and relapse prevention.

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  • Fat Makes You Fat

    <strong>Why that's BS: </strong> It depends on the type of fats you're eating, says Tricia Psota, RD, a nutritionist based in Washington D.C. "Fats in chips, cookies, and greasy foods can increase cholesterol and your risk for certain diseases. But good fats, like nuts, avocados and salmon, protect your heart and support your overall health." And when paired with a healthy diet, the right fats can help keep you from being, well, fat, adds Sharon Palmer, RD, author of The Plant-Powered Diet.

  • Stop Snacking To Lose Weight

    <strong>Why that's BS:</strong> Eating in small, frequent amounts is a great way to curb hunger, control portion sizes, and make better nutritional choices, says Mike Clancy, CDN, a personal trainer at David Barton's Gym in New York City. "Smarter snacks like nuts, fruits, and yogurt will keep your energy levels high throughout the day." (Need proof? Our 400 Calorie Fix plan -- which involves three or four meals plus snacks -- can help you lose 11 pounds in just two weeks!)

  • A Calorie Is A Calorie -- And You Should Count Them

    <strong>Why that's BS:</strong> "Not all calories are the same," says Clancy. "The type of calories, the timing of the calories, and the quality of the calories can significantly alter the effect of the calories on the body," he says. "Food creates reactions within our bodies and the type of food you eat is an important component in diets." For example, 50 calories of an apple will cause a different internal reaction than 50 calories of cheesecake, says Clancy. "The quality of the calories is also important because the chemicals, hormones, and general byproducts that are found within processed food effects the absorption of real nutrients." Quality calories are nutrient dense, like spinach. Calories that don't contain any nutrients -- also known as "empty" calories -- are like the ones found in French fries. Bottom line: Calories are important for understanding portion control, but they’re not the only factor in good nutrition, says Clancy.

  • Cut Out Carbs

    <strong>Why that's BS:</strong> The research on carbohydrate intake is often misinterpreted, says Chrissy Carroll, MPH, RD, founder of Inspired Wellness Solutions, LLC. "Yes, it is true that excessive intakes of refined carbohydrates, like white bread or white rice, may lead to weight gain or increased cardiovascular risk. But there is no research suggesting that healthy carbohydrates, such as whole grains, fruits, vegetables, or legumes, can negatively impact health or weight. On the contrary, many studies suggest a diet high in these plant-based foods is associated with better overall health." Case in point: A 2002 American College of Nutrition study that found replacing refined grains with whole-grain and minimally processed grain products, along with increasing the intake of fruits and veggies, can help lower dietary glycemic load and insulin demand. This, in turn, can ultimately reduce the risk of both type 2 diabetes and heart disease, says Kristin Kirkpatrick, MS, RD, manager of wellness nutrition services for the Cleveland Clinic Wellness Institute. So, keep the carbs! And aim for those that come from 100% whole grains or fruits, adds Kirkpatrick.

  • Load Up On Protein

    <strong>Why that's BS: </strong>Sorry, caveman lovers: eating lots of protein is not the key to healthy weight loss. Why? The body needs three macronutrients: Protein, carbohydrates, and fat, says Rania Batayneh, MPH, a nutritionist and author of the forthcoming The One One One Diet (published by Rodale, which also publishes Prevention), and focusing exclusively on protein for weight loss makes no sense. "You not only deprive your body of fiber and other antioxidants found in healthy carbohydrates -- whole grains, fruits, and veggies -- but you also run the risk of eating too much fat in your diet which can lead to high cholesterol and triglycerides.”

  • Go Gluten-Free To Lose Weight

    <strong>Why that's BS: </strong>There's no scientific evidence that gluten is a particularly fattening ingredient, says Palmer. "The problem is that we eat too many refined grains -- foods made of white flour or other refined grains," she says. And cutting gluten without checking with your doctor first can lead to deficiencies in important nutrients, such as fiber, iron, vitamin B12 and magnesium, says MaryAnne Metzak, CDN, a nutritionist in Southampton, NY. In the meantime, focus on getting healthy whole grains in moderate portions.

  • You Burn More Calories Working Out On An Empty Stomach

    <strong>Why that's BS:</strong> Working out with or without food in your stomach doesn't affect calorie burn -- but skipping meals before sweat sessions may result in muscle loss, finds a study published in the Strength and Conditioning Journal. And before you settle for a sports drink, know this: While a quick sip of sugar energizes your muscles, the drink’s other artificial additives can be harmful to your health, says Sanda Moldovan, DDS, MS, CNS, a diplomat of the American Academy of Periodontology. Instead, go for naturally sweet fruit, like bananas, peaches, and mangos before your sweat session. Or try an ounce of dark chocolate for the same caffeine fix you get from a half cup of coffee. "Chocolate also contains feel-good substances, called neurotransmitters, which are the same release during a 'runner's high,' " says Moldovan.

  • Eat Every Two Hours To Rev Your Metabolism

    <strong>Why that's BS:</strong> Going four or five (or even eight!) hours between normally-sized meals will not make your metabolism slow down, says Monica Reinagel, MS, a nutritionist based in Baltimore. "Eating more frequently may help stave off hunger, which can help you fight temptation. But if you want to do this, you have to be careful to keep your meals and snacks really small," she says. "Otherwise, eating every 2 hours can simply lead to taking in too many calories over the course of the day."

  • Watch What You Eat During The Week, But Take The Weekends Off

    <strong>Why that's BS: </strong>Throwing caution to the wind on the weekends can offset the consistency and success you had all week, says Batayneh. "On the weekends, we tend to sleep in, maybe missing our workout, typically drink more alcohol and have heavier meals. So if you lose about one pound between Monday and Friday, you just might gain it back -- or at least maintain it, really taking away the efforts towards weight loss." Which means if you're trying to lose weight, the weekends shouldn't be a free-for-all. You still need a plan, says Batayneh. Some suggestions: passing on the bread basket and limiting yourself to one cocktail.

  • Swear Off Forbidden Foods

    <strong>Why that's BS:</strong> "We tend to be in 'all or nothing' mode when we diet and never seem to find a middle ground," says Batayneh. "You have to realize that you can’t have pizza, French fries, and chocolate cake all in the same day, but -- with careful planning -- you can enjoy these foods when they are presented to you. Just don’t go for seconds and share if you can." In fact, research shows that moderately indulging in "forbidden foods" is what keeps people from bingeing on the stuff.

Researchers were also interested in determining whether apps incorporate technology features to enhance behavioural strategies.

Enhancements include barcode scanners that can be used in a supermarket to instantly get nutritional information, social networks where users can encourage and support each other, email and text reminders, and calendars for scheduling exercise and tracking food intake.

Martyn Landi, reviews editor with British-based Apps magazine, said weight-loss software should not be used in isolation as a means of fighting fat.

"A little bit of common sense is needed with these apps," he said.

"There are a few weight-loss apps, mostly driven towards the fitness tracker-style download and those offering recipe ideas.

"But apps are becoming more sophisticated as they develop. We are seeing the introduction of some motivational techniques in fitness tracker downloads where messages can be pre-recorded so that they play while a person is jogging."

The tech expert also said there was scope for further developments within the market.

"Apps are becoming increasingly geared to our lifestyles," Mr Landi said.

"Smartphones are so prevalent, they are such a part of our lives that almost every aspect of our lifestyle is being catered for with apps.

"Many now have a 'sharing' facility, meaning users can compare their progress with friends, so I think we are seeing some degree of motivational function already."

The two top-rated apps, according to the study, are MyNetDiary PRO (paid-for) and MyNetDiary (free).

Dr Pagoto said: "Free apps were just as likely as paid apps to include evidence-based strategies. That's the good news for the consumer.

"Where we're hoping the next generation of apps can do better is in incorporating some of those strategies that help the user who might not be so good about entering their diet every day and staying on track with their goals."

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