U.S. News evaluated and ranked the 41 diets below with input from a panel of health experts. To be top-rated, a diet had to be relatively easy to follow, nutritious, safe, effective for weight loss and protective against diabetes and heart disease. The Mediterranean diet took the top spot, while the government-endorsed DASH diet, which stands for Dietary Approaches to Stop Hypertension, came in second.

Weight loss ultimately comes back to the concept of calories in, calories out: Eat less than you burn and you’ll lose weight. And while it’s possible to lose water weight quickly on a low-carb diet, I certainly wouldn’t advocate for it. The diet itself can trick you into thinking that this eating style is working — when really, you might gain back what you lost as soon as you eat carbs again. That can feel incredibly dispiriting if you want results that last longer than a week.


"Don't buy low-fat dairy products. They're usually loaded with sugar. Besides, an American Journal of Clinical Nutrition study found that the more high-fat dairy products a person ate, they lower their risk of diabetes; the more low-fat dairy products, the higher their risk. — Mark Langowski, celebrity trainer and author of Eat This, Not That! for Abs

When we began our research on Nutrisystem, the first thing that stood out to us was the variety of  plans they offer. In total, there are nine different options, including plans for diabetics, vegetarians, and even special diets for men (a rarity in the diet industry). Also, most of their plans are highly customizable, so if you don’t like their recommendations you can customize your meal plan from chef-created menu items including staples like chicken masala, cheesesteak pizza, muffins, burgers, popcorn, and lots more.
Phase 1: This is the “metabolism reboot” phase, and the most restrictive part of the plan (but it only lasts two weeks, so that’s good news). You’ll basically cut all carbs from your diet, as this phase allows for no more than 40 grams of net carbs per day. The purpose of this first phase is to reset your metabolism and help your body burn fat instead of carbs. Carb lovers beware! You will not be able to eat bread, pasta, rice, and some fruit, which might be too restrictive for some. Because of this strict approach, you’ll most definitely see weight loss results at the end of the plan’s first seven days.
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“This is a great way of eating that I highly recommend to many clients, and I even model in my own life,” says Elizabeth Shaw, RDN, who is in private practice in San Diego and is the co-author of Fertility Foods Cookbook. “Since the premise of the diet is designed to help people who have high blood pressure, low-sodium foods are recommended. But considering that most Americans exceed their daily sodium levels anyway, it’s not surprising that dietitians recommend this style of eating for treating many different conditions, such as heart disease and obesity.”
Your New Year's resolution diet should be based on a well-balanced eating plan that fits your lifestyle, rather than a weird fad replete with food restrictions. That's according to U.S. News & World Report's best diet rankings for 2018. The two diets that tied for the top spot -- the Mediterranean Diet and the DASH Diet -- fit that bill because they feature real food and reasonable, flexible guidelines, experts said.

Christy Brissette, MS, RD is one of North America's top dietitians and a leading nutrition and food communications expert. She is the President of 80 Twenty Nutrition, a nutrition and food media company. Her mission is to end food confusion and dieting once and for all. Christy appears on national TV and is interviewed for international magazines, radio and websites. She empowers her clients to look and feel their best with the healing power of healthy, delicious food. She helps clients achieve results through cutting-edge, creative and fun meal plans and recipes. You can still enjoy your favourite foods and have the body of your dreams!


Processed, packaged foods are often loaded with more salt, sugar, and refined carbs than you’d put in the foods you cook for yourself. When you’re looking to drop weight fast, avoid foods that come in packages and stick to whole, unprocessed foods. Build your plates with non-starchy veggies, unprocessed whole grains, lean proteins, and healthy fats, and season with spices, not salt.
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.”

It seems counterintuitive to drink lots of water when you’re looking to lose weight fast—especially water weight—but staying hydrated is one of the most important steps you can take to lose weight. People often mistake thirst for hunger, so staying hydrated allows you to be more in touch with the times when you are actually hungry, rather than just thirsty. Plus, a lot of good things happen to your body when you drink enough fluids.
"It's no big surprise, but my go-to weight loss tip is to eat more vegetables. They are the most low-calorie food you can consume, and they're filled with health-boosting, satiating nutrients. From smoothies and eggs to soups, main and side dishes, they can fit in anywhere and boost volume and nutrition. If you want to eat more while still losing weight, veggies are your answer. —Laura Burak, RD, CDN 

If you’re only getting a minimal amount of sleep each night, that leaves more time for you to snack and make otherwise unhealthy decisions that could affect your weight loss. Although it will vary from person to person on how much sleep you actually need to be most effective (and therefore make progress toward your weight loss goals), the ideal number is typically 7 or 8 hours, says Dr. Cheskin.
According to its fervent proponents, humans were not made to be eating constantly; rather, we were designed to eat for short periods of time followed by hours (and sometimes days) of fasting. Much like vegetarianism, intermittent fasting is practiced for two main reasons: health and religion/spirituality. There are no food or caloric restrictions, but rather a restriction on WHEN to eat. The most popular methods include the 16/8 (8 hours of eating followed by 16 hours of fasting), the “Eat-Stop-Eat” method (two 24-hour fasts per week on non-consecutive days); and the 5/2 method (only 500 calories for 2 non-consecutive days, and 5 days of normal eating per week). While it's generally considered a healthy approach to eating when done moderately, some studies suggest extreme fasting may lead to hair loss and anxiety. 
A 2015 study from the Annals of Internal Medicine showed that for those who have a hard time following a strict diet, simplifying the weight loss approach by just increasing fiber intake can still lead to weight loss. Women should aim for at least 25 grams of fiber per day (based on a 2,000-calorie) diet, according to the most recent U.S. Dietary Guidelines. Start with our high-fiber diet plan.
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.
"Don't buy low-fat dairy products. They're usually loaded with sugar. Besides, an American Journal of Clinical Nutrition study found that the more high-fat dairy products a person ate, they lower their risk of diabetes; the more low-fat dairy products, the higher their risk. — Mark Langowski, celebrity trainer and author of Eat This, Not That! for Abs
Spending more time in the kitchen can help you shed belly fat, as long as you’re cooking with the right foods, according to one 2017 study. After analyzing data from more than 11,000 men and women, UK researchers found that people who ate more than five homemade meals per week were 28 percent less likely to have a high body mass index, and 24 percent less likely to carry too much body fat than those whole only downed three meals at home.

“This is a great way of eating that I highly recommend to many clients, and I even model in my own life,” says Elizabeth Shaw, RDN, who is in private practice in San Diego and is the co-author of Fertility Foods Cookbook. “Since the premise of the diet is designed to help people who have high blood pressure, low-sodium foods are recommended. But considering that most Americans exceed their daily sodium levels anyway, it’s not surprising that dietitians recommend this style of eating for treating many different conditions, such as heart disease and obesity.”
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