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" 1. Paleo Diet While this meat- and nut-heavy diet is full of nutrients, it&amp;#039;s also calorie-packed \u2014 as in, not a recipe for weight loss. This diet can be hard to follow because it restricts carbohydrate intake, limiting even healthy sources found in fruit, says Erin Macdonald, a registered dietician and health coach. Although many athletes adopt this protein-heavy diet, she also notes that cutting out carbs, your body&amp;#039;s preferred source of fuel, can make you lethargic. 2. Atkins Diet This plan allows plenty of bacon, butter, and cheese, yet shuns carbohydrates. Without the healthy carbs in grains and fruit, your body burns fat for fuel, which &amp;quot;gives you headaches and damages your heart and arteries,&amp;quot; warns Macdonald. Besides, low-carb diets are hard to follow because &amp;quot;any time you restrict a certain food, it triggers cravings and sets up a restriction-binge cycle,&amp;quot; says registered dietitian Dawn Jackson-Blatner.  3. Juicing Juicers actually eliminate healthy fiber by straining the pulp, and these &amp;quot;healthy&amp;quot; juices contain 50 to 70% fruit \u2014 an average of 50 grams of sugar per tall glass. &amp;quot;They&amp;#039;re missing the two most important things: fiber and protein, which curb hunger,&amp;quot; Macdonald says. Worse still, a Harvard study found that those who drink fruit juice have a higher risk of developing type-2 diabetes. 4. Dukan Diet Dukan revolves around eating a lot of meat while discouraging carbs, high-fiber beans, nuts, fruit, and lentils. &amp;quot;Diets low in fiber don&amp;#039;t leave you feeling full, so you go off it or eat large portions,&amp;quot; which can result in weight gain, says bariatric physician, Sue Decotiis, MD. Then there are the extreme protein-only days, which can make dieting unenjoyable and, potentially, a waste of time.  5. Acai Berry Diet After Oprah announced that incorporated the Amazon rainforest berries into her diet, people started believing that they were fat-busting, cleansing miracle-workers. Reality check: &amp;quot;I haven&amp;#039;t seen it burn calories,&amp;quot; says Dr. Decotiis. And, the berries are usually paired with a colon cleanser, which can be dangerous. &amp;quot;When your gut is healthy, it will get rid of the waste it needs to get rid of,&amp;quot; she adds.  This story originally appeared on WomansDay.com Photo credits: nitrub/iStock360/Getty Images; Matthew Wakem/Photolibrary/Getty Images; Kim Wilson/iStock360/Getty Images  NEXT: 10 Tips You Should Steal From Popular Diets \u00BB "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodhousekeeping.com/health/diet-nutrition/a25124/unhealthy-popular-diets/>