This nutritionally sound book-based food plan is based on the research of Barbara Rolls, PhD, professor of nutrition at Penn State University. Rolls says you can lose one to two pounds per week on the plan. The theory is that by swapping out calorie-heavy fat-laden foods with fruits and vegetables that have a lot of water in them, you can eat more for fewer calories. To boost weight loss, you will need to be active—aim for 10,000 steps a day. You might not lose weight as fast, but Rolls has both short-term and long-term evidence to support her approach. Read more about it in Rolls’ latest book, The Ultimate Volumetrics Diet.
Many diet plans cut out entire food groups, which can create nutrient deficiencies as well as health problems. For instance, if the diet is very low in carbohydrates and you have type 1 diabetes or type 2 diabetes, it’s probably not a good fit. And if it’s too restrictive and you’re pregnant or breastfeeding, it’s not a good idea, either. Keep in mind that pregnancy is not a time for weight loss. Speak with your doctor before making any changes to your diet if you are pregnant or breast-feeding.
A favorite of health experts, the DASH diet has the primary goal of limiting sodium and lowering blood pressure, but the bonus is losing weight by shifting to a healthier way of eating. The DASH diet plan advocates building meals around fruits, veggies, whole grains, lean meats, and healthy fats. Evidence demonstrates that the approach is effective, especially when you add in regular exercise. You can improve your results, suggests some research, by adding more lean protein to the diet. This is one of the healthier approaches, and it’s easy to adapt to your needs, though the salt restrictions make eating out tough. Looking for another way? Check out these other weight loss tricks that don’t require diet or exercise.
“Don't like eating meat?” asks Ginger Hultin, RDN, a dietitian in private practice in Seattle and a spokesperson for the Academy of Nutrition and Dietetics. “Then don't be paleo! Travel a lot and rely on eating out? The DASH diet may end in frustration for you.” The bottom line: The diet you choose needs to be safe and effective, while taking into account your lifestyle.
So how does this work? A quick run-through: The first tip was to eat low carb. This is because a low-carb diet lowers your levels of the fat-storing hormone insulin, allowing your fat deposits to shrink and release their stored energy. This tends to cause you to want to consume fewer calories than you expend – without hunger – and lose weight. Several of the tips mentioned above are about fine-tuning your diet to better this effect.

The HMR program’s approach makes the top of the list of best diet plans because the Decision-Free plan suggests you can lose up to 66 pounds in 26 weeks. You could also drop 37 pounds on its Healthy Solutions option. The Decision-Free diet is a medically supervised, very low-calorie diet of shakes and snacks; Healthy Solutions includes shakes, snacks, entrees, and your own fruits and vegetables. You should expect to exercise plenty to lose the most weight; you can also sign up for health coaching to boost success. The convenience is a plus—but you will get a very limited choice of foods and aren’t allowed to drink alcohol or eat out. And remember: You risk gaining weight once you go back to real food. Check out these 42 tips for losing weight fast.
This high-protein, low-carbohydrate, diet plan claims you can lose nine pounds in two weeks. South Beach is different from other low-carb diets because it incorporates more unsaturated fats, such as those in olive oil and avocados, rather than saturated fats. On the downside, the cost can add up quickly if you’re buying the meals, and the first few phases of the diet don’t allow for eating out (or ordering in). No matter which diet plan you choose, avoid these 20 foods that are never worth the calories.

Even if you do meet your goal, it's nearly impossible to keep off the weight over the long term: "The amount of restriction required [to maintain that number] will make you so hungry that you’ll eat everything in sight—it’s survival instinct," Dr. Seltzer says. And since calorie restriction gradually slows your metabolism, your body will be less prepared to burn the foods you binge on, he adds. That could mean gaining more pounds than you lost in the first place.
Real talk: It could take weeks or months to see the metabolic effects of exercise on the scale, and even then, building muscle, which is denser than body fat, could lead to weight gain. "Do what you like because it’s good for you," Dr. Seltzer says, noting the way exercise is awesome for your heart, mental health, and more—and that not all measure of progress can be seen on the scale.
When it comes to cravings, protein drinks and bars may also help cure your need for sugar, says Juge. He recommends mixing a flavored protein powder in a blender with as much ice as possible, so it'll taste more like a milkshake. Day Five's protein shake includes a cup of berries, which will also help with sugar cravings. Once or twice per week, Juge adds, you can have a low-sugar, high-protein bar. The newest varieties taste more like candy bars, with state-of-the-art sweetening techniques.
Since we are talking about setting a meal plan, we need to talk about how many calories you should plan to eat. If your goal is to lose weight, all you need to know is your goal weight. The equation is easy; add a zero to the end of your goal weight to find your daily calorie goal. Just be sure not to go under 1200 calories per day as this will send your metabolism into preservation mode, which may cause your body to hold onto weight instead of releasing it.
To encourage ketone production, the amount of insulin in your bloodstream must be low. The lower your insulin, the higher your ketone production. And when you have a well-controlled, sufficiently large amount of ketones in your blood, it’s basically proof that your insulin is very low – and therefore, that you’re enjoying the maximum effect of your low-carbohydrate diet. That’s what’s called optimal ketosis.
Keeping fruits and vegetables in your line of sight could encourage you to eat more of them—rather than other high-calorie snack options. On the other hand, research shows that when unhealthy options are in full view, hunger and cravings may increase. One study published in Health Education & Behavior specifically found that when high-calorie foods are more visible at home, the residents are more likely to weight more, compared to people who only keep a bowl of fruit out. These are the superfoods that could help you lose weight.
Meal prep, short for meal preparation, is the process of planning and preparing your meals ahead of time. You can meal prep one day ahead, or take one day to prepare lunch and/or dinner for an entire week. While most meal prep only one or two meals, you can easily meal prep breakfast, lunch and dinner, even snacks for the week ahead. It’s entirely up to you!
"Researchers around the world say what really works is not just cutting calories but satisfying your hunger with the right kinds of foods," says Health’s Frances Largeman-Roth, RD. In fact, women following a low-fat diet who were allowed to fill up on all the fruit and vegetables they wanted lost 23% more weight than women on a low-fat diet alone, a new study from the United Kingdom reports.

Use leftover spaghetti for lo mein the next night. Toss 1 cup of the spaghetti with 12 peanuts and 1 cup of chopped celery, onions and bok choy that's been sauteed in 1 teaspoon of vegetable oil for 425 calories. Make fish tacos with 3 ounces of grilled halibut stuffed into two 6-inch corn tortillas with lettuce and chopped tomatoes and served with 1/2 cup of a mix of brown rice, black beans and corn for 405 calories.
Skimp on fluids, and your body will release an antidiuretic hormone that leads to water retention that could affect the scale, Dr. Setlzer says. While this sneaky effect is one reason why the scale is a poor measure of body mass loss, you can outsmart it by drinking more—particularly if you fill your glass with water or non-calorie alternatives like unsweetened coffee and tea.
“Intermittent fasting can be really challenging if you have an ever-changing schedule,” adds Hultin. “If you're traveling and crossing time zones, it could be very difficult to follow. It might be best for people with more stability in their lives.” Intermittent fasting isn’t safe for people with type 2 diabetes, children, pregnant or lactating women, or anyone with a history of an eating disorder.
Preheat oven to 400°. Slice 1 small potato into fry shapes; toss with 1 teaspoon olive oil and 1 teaspoon chili powder. Roast on baking sheet until golden (about 30 minutes). Grill 1 (3-ounce) sirloin steak until desired degree of doneness; slice into thin strips. Fill 6 Romaine lettuce leaves with steak. Top with 1/2 cup thinly sliced red bell pepper; drizzle with 1 tablespoon balsamic vinaigrette.
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