Created in 2003 by cardiologist Arthur Agatston, this low-carb diet features three phases. The first phase is the most restrictive, limiting carbs such as potatoes and rice. Each subsequent phase becomes more lenient, and the diet emphasizes lean protein, unsaturated fats, and low-glycemic carbs such as nonstarchy vegetables. South Beach promotes lasting lifestyle changes, according to the Mayo Clinic. (21)
When it comes to all things weight loss, the simplest, fastest way to make impactful, lasting change is to form habits you can actually stick with for life. That’s why this plan involves an easy-to-follow meal planning guide. This full week of (delicious!) food will take the guesswork out of grocery shopping and prepping with nutritionist-approved breakfast, lunch, and dinner ideas. If you have a higher activity level, check out these 1,300-, 1,400-, 1,500-, and 1,800-calorie meal plans as well.
There are many ways to do intermittent fasting — ranging from fasting for a number of hours each day up to an entire 24-hour fasting period one or two times a week. “If you're trying to kick a habit like eating late into the night, then stopping eating earlier in the evening and fasting overnight could be beneficial for you,” says Hultin. “There are many types of intermittent fasting, so ensuring you pick one that works for you and your lifestyle is important.”
Still, it’s a worthy goal to lose belly fat because it’s “unfortunately the most dangerous location to store fat,” says Lawrence Cheskin, MD, chair of the department of nutrition and food studies at George Mason University and director of the Johns Hopkins Weight Management Center. Because belly fat—also known as visceral fat, or the deep abdominal fat that surrounds your organs—is more temporary, it circulates throughout the bloodstream more regularly and is therefore likelier to raise the amount of fat in your blood, increasing your blood sugar levels and putting you at a greater risk of heart disease and type 2 diabetes.
At any given time, there are dozens of weight-loss hypes in the marketplace that claim to take off 10 pounds in 10 days, or whatever. Desperation can tempt us to try anything — from "clean eating" to cutting out food groups entirely. Keep in mind: Just because an avocado-kale-salad dripping in coconut oil is deemed "clean" by a so-called "expert" on your Instagram feed does not make it an unlimited food. Moral of the story? Avoid fads, eat real food, watch some Netflix, and unwind (perhaps with a glass of wine in hand). Now that's my kind of detox.

"Whether you have ten pounds to lose or 100, the first thing you should do is create an environment for success." That requires removing all temptation from your kitchen and reorganizing your pantry for weight loss. "Collect all of the processed, sugary and fatty foods from your house, and bring them to a local food bank for donation. Then restock your kitchen with healthy groceries—real, natural, whole foods—like fresh fruits and vegetables, almonds and lean proteins like turkey, chicken, fish and eggs." — Chris Powell, the trainer who has helped hundreds of overweight people lose up to half their body weight on ABC's reality series Extreme Weight Loss

The best diet for losing weight is Weight Watchers, according to the experts who rated the diets below for U.S. News. Volumetrics came in second, and the Flexitarian Diet, Jenny Craig and the vegan diet were third on this overall weight loss ranking list, which takes into account short-term and long-term weight loss scores. Some other diets performed as well or better in our rankings for enabling fast weight loss, but long-term weight loss is more important for your health.
When it comes to the "best" diet for most people, this one consistently ranks at the top of every list. If you can't afford a cruise to the Mediterranean (yet!), at least you can eat like the beautiful, long-living, and famously healthy people from the region. The Mediterranean diet teaches you to eat like a Sardinian, one of the "blue zones" identified by researchers as having a high number of people living past 100—by eating more fish, olive oil, healthy fats, and fresh vegetables. The point is to have not just a longer life but also a healthier and happier one, whether you're trying to lose weight or not. (Really—research shows that you can reap the benefits of the Mediterranean diet without cutting calories.)

The fad military diet consists of low-calorie, odd food pairings such as bun-less hot dogs with banana, carrots, and broccoli. “Any diet like the military diet that severely limits the amount of calories you consume or eliminates one or more entire food groups puts any individual at risk for nutrient deficiencies,” says Kyle. “This can be more harmful than holding onto those 10 extra lb you’re trying to lose.” (32)
Incorporate a 12-hour fast. Don't panic — most of this fast occurs while you sleep. Restricting your eating to 12 hours a day may help you lose weight, according to one study.[14] You should still eat your recommended daily calories, but limit yourself to only eating during a 12 hour period. So you might eat breakfast at 7am and cut yourself off from eating after 7pm. Though it is not fully understood, this 12-hour fasting period may cause your body to switch from burning food to burning fat.
Research demonstrates that eating later can actually lead to slower weight loss, while eating a larger meal at breakfast and smaller meals throughout the day can help you lose more weight! And while we’re not going to tell you to restrict yourself to no food after 6 p.m, it’s important to consider what time of day you struggle most with temptation.
"When you're anxious, your body feels like it's under a tremendous amount of stress all the time. This is why anxiety is a powerful trigger for weight gain. Two of the most proven cures for anxiety are exercise and spending time in nature. Combine both with an outdoor run or bike ride and race away from the anxiousness. Making this habit part of your lifestyle can help you stay lean for life." — David Zinczenko, author of the Zero Belly Cookbook
Right now, this is the trendiest of all diet theories. It prioritizes the consumption of foods high in protein and fat while limiting the number of carbs per day to less than 20%. This means abstaining from grains, starchy vegetables, and fruits, and filling up on protein and fat. The most famous of all low-carb plans is the Keto Diet, an approach based on the metabolic process of ketosis, which happens when you restrict your carb intake to less than 0.7 grams per day and your body starts using fat, and not carbs, as its main fuel. 
Like protein, fiber slows the rate at which your body plows through carb calories so you feel full for longer and maintain steadier blood sugar levels, one reason why research consistently links fiber intake to weight loss. That means fibrous whole grain bread tends to be a better choice than white bread and also explains why fruits, which contain fiber and valuable vitamins in addition to sugar, beat straight-up candy every time.
"When you're anxious, your body feels like it's under a tremendous amount of stress all the time. This is why anxiety is a powerful trigger for weight gain. Two of the most proven cures for anxiety are exercise and spending time in nature. Combine both with an outdoor run or bike ride and race away from the anxiousness. Making this habit part of your lifestyle can help you stay lean for life." — David Zinczenko, author of the Zero Belly Cookbook
"While losing weight for effective long-term benefits takes time, there are a few quick ways to help shed 10 lbs in a month or so. It requires getting into a routine you know you'll stick with, making small nutritional changes so that you can stick with a plan, and having a bit of patience before you notice changes. It takes 4 weeks for you to see changes in your own body, and sometimes up to 8 weeks for others to notice!" — Nicole Houvig, AFPA Certified Personal Trainer with the Rockay expert team
Flexitarian: A mix between the words “flexible” and “vegetarian”, the Flexitarian diet can be described as a vegetarian going on a short carnivore vacation. It is a mostly vegetarian diet that sometimes incorporates meat, fish, and poultry, and it is ideal for people who want to benefit from vegetarianism but cannot resist the temptation of animal products.  Also, a recent study suggests that, by going meatless from time to time, you may actually help in the fight against climate change. 
"Burpees are such a great way to activate multiple muscles, get the heart rate up and burn mega calories. In one single burpee, you work your legs, arms and abs and you also elevate the heart rate to increase cardiopulmonary strength. If you're looking to lose weight, incorporating them into your workout routine is a must."—Kit Rich, celebrity trainer and co-owner of SHIFT by Dana Perri
Ansari says alcohol can prevent weight-loss in several ways, including the fact that heavy alcohol intake can stimulate food intake. "Binge drinking can overload the liver. The liver then prioritizes processing alcohol over other nutrients and then stores the protein, carbs, and fat as fat in the body," Ansari explains. The Centers for Disease Control and Prevention (CDC) defines binge drinking as having five or more drinks for men, and four or more drinks for women in two hours. "Also, alcoholic beverages are often mixed with sugar-rich beverages. Drinking more than moderate amounts of alcohol can cause calories to add up quickly."
Consequently, researchers have widely discredited the hCG diet, which involves using hCG injections, pellets, sprays, or drops, and consuming  as few as 500 calories daily. The diet is problematic not only because there’s a lack of research on hCG supplements, but also because the calorie requirement is dangerously low, potentially leading to nutrient deficiencies, fatigue, hormone imbalances, blood clots, and other issues. Thus, most experts agree the hCG diet is not safe for anyone, the Mayo Clinic notes. (35) 

Going long periods of time without food does double-duty harm on our healthy eating efforts by both slowing down your metabolism, and priming you for another binge later in the day. (Think: You've skipped breakfast and lunch, so you're ready to takedown a whole turkey by dinner!) Make it your mission to eat three meals and two snacks every day, and don't wait longer than three to four hours without eating. Set a "snack alarm" on your phone if needed.

We're taking advantage of all the healthy items you can find at Trader Joe's to create these healthy meal-prep lunches. To add extra protein (while minimizing prep time), we're using Trader Joe's fully cooked quinoa and cooked shrimp, both of which you can find in the freezer section. With a few more simple items, including bottled salad dressing, you'll have all the ingredients you need to make these high protein lunch bowls in under 20 minutes.
"Don't skip breakfast—it really is the most important meal of the day. Eat breakfast within 90 minutes of waking, and then have something healthy to eat every three to four hours after that. When we skip breakfast or wait too long to eat in the morning, our bodies start to conserve energy and our metabolism slows down. Skipping breakfast also leads to overeating throughout the day." — Ilyse Schapiro, MS, RD, CDN, author of Should I Scoop Out My Bagel?
"Use a VersaClimber or take a VersaClimber class. These machines are still not that common, but in my opinion they are far more effective for weight loss than other forms of cardio. They require you to use a large portion of your muscles and it's functionally better for you than other forms of cardio like spinning. Everyone is talking about Rise Nation in LA at the moment as they are the first dedicated VersaClimbing studio. There's no harder cardio workout I have tried. To lose fat you have to put in the work. — Dan Roberts, celebrity trainer and creator of Methodology X
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