This meal replacement plan has mixed scientific evidence to support it. SlimFast promises a reasonable one- to two-pound loss per week, but you’ll need to buy its shakes, bars, and other products. The 1,200-calorie plan allows for one 500 calorie meal of regular food daily, with the rest of the calories made up of SlimFast products, fruits, and vegetables. The hard part will be sticking with the program; also, the SlimFast foods contain a lot of processed ingredients and artificial sweeteners. This isn’t for people younger than 18, or pregnant or breastfeeding women without medical supervision. Make the most of your one meal with 11 simple swaps that lead to dramatic weight loss.

Weight loss isn’t a linear event over time. When you cut calories, you may drop weight for the first few weeks, for example, and then something changes. You eat the same number of calories but you lose less weight or no weight at all. That’s because when you lose weight you’re losing water and lean tissue as well as fat, your metabolism slows, and your body changes in other ways. So, in order to continue dropping weight each week, you need to continue cutting calories.

Keeping a food journal could help you reach your weight loss goals. Best Health reports a recent study found participants who kept daily food records lost twice as much weight as those who kept no records. Colleen Cannon, a clinical psychologist in Canada who specializes in helping people deal with the emotional side of eating, says the act of writing down what we eat helps us become more aware.
If taking the time to slice and dice vegetables holds you back from eating them, then invest in the pre-chopped or pre-washed vegetables. Rene Ficek, RD, the lead nutrition expert at Seattle Sutton’s Healthy Eating says fresh produce is the cornerstone of healthy nutrition—and using pre-chopped vegetables could cut your cooking time in half. “Plus, keeping sliced veggies and prepared dips like hummus are great to have on hand at all time,” Fieck adds.
Put into a soup pot 1 can of no-salt-added red beans (drained), 4 cups low-sodium vegetable juice like Knudsen’s Very Veggie Low-Sodium Juice, 2 to 3 teaspoons oregano or Italian-style seasoning, and 2 cups of any veggies you already have sitting in the refrigerator bin, such as carrots, celery, and onions. Rough-chop the vegetables into bite-size pieces and bring to a boil, simmering until vegetables are crisp-tender, about 10 to 15 minutes. If desired, top with a tablespoon of fat-free sour cream.
Different foods have different nutritional values, even if they sometimes have the same number of calories. And making a few simple food swaps could be beneficial for both your health and your waistline. Felicia Stoler, RD, an exercise physiologist, suggests swapping margarine for butter, corn oil for soybean oil, corn-fed proteins for grass-fed proteins, and artificial egg whites for farm fresh eggs. “Smart consumers are choosing grass-fed options because those tend to have more nutrients and fewer added hormones,” Stoler says.
Knowing what you're going to eat for dinner may help prevent those last-minute stops at the fast-food restaurant. Spend a little time once a week planning out your dinner menu and prepping ahead, such as defrosting your chicken and chopping veggies. Make a healthy chicken Parmesan by topping a 3-ounce grilled chicken breast with 1/2 cup of tomato sauce and 1 ounce of low-fat mozzarella cheese, and serve it with 1/2 cup of cooked whole-wheat spaghetti and 2 cups of steamed broccoli. This meal has 425 calories.

Big salad of baby greens with Pritikin-Style Thousand Island Dressing, which has less than one-quarter the calories and sodium of regular Thousand Island Dressing. What a gift for your heart and waistline! To make dressing, combine thoroughly the following: ¾ cup plain fat-free Greek yogurt, ½ cup fat-free sour cream, ¾ cup unsweetened, low-sodium ketchup (good brand is Westbrae), ½ teaspoon oregano, and ½ teaspoon granulated garlic.
Consuming protein in the morning will stabilize blood sugar, Sharon Collison, RD, sports dietitian and clinical instructor at the University of Delaware says. “Make sure to have an excellent source of protein with every breakfast such as Greek yogurt, cottage cheese, or two to three eggs,” she says. Eating more protein earlier in the day could also help reduce sugar cravings in the late afternoon, Collison adds.

Make sure that the diet has been studied extensively for safety — and discuss any changes with your physician or registered dietitian before beginning a new diet. (If you don’t have a dietitian, find one in your area at the Academy of Nutrition and Dietetics website.) And do a self-check to ensure the diet fits with your own values and preferences.
Portion control is another key element of weight loss. Part of the process is understanding an actual serving size. Measuring high-calorie ingredients will help you learn to eyeball portions. Even calories from healthy foods add up. “One of the foods people love are healthy fats, which are great,” Amari Thomsen, MS, RD, LDN, dietitian, and founder of Eat Chic Chicago says. Your definition of a handful of nuts might be four times bigger than an actual serving size, she warns.

Similar to the CICO diet, the Body Reset has gained popularity via social media, and there isn’t any definitive research that suggests the approach is safe and effective. Celebrity trainer Harley Pasternak created the plan, which is essentially a three-phase liquid diet comprised of smoothies and moderate exercise. While U.S. News notes you may lose weight on the diet, it may be tough to stick with, and isn’t safe for people with diabetes and heart disease. (38)
This company’s latest plan, Turbo 13, promises you’ll lose 13 pounds (and seven inches from your girth) in the first month. When you join Nutrisystem (membership is required), you’ll mix their pre-packaged meals with food you buy at the grocery store. The plan recommends splitting up your meals into a six a day. As with many diet plans, the research backs the short-term results, but there’s little evidence that it works in the long term. Convenience is the biggest pro; cons are the price and the highly processed foods. Nutrisystem is not for you if you are under 18, pregnant, or breastfeeding, or if you have food allergies. For research-backed tips, try these scientifically proven ways you can start losing weight right now.

It could be beneficial for your health and your weight loss goals to drink more water and less alcohol. Dr. Bazilian says that alcohol doesn’t have to necessarily be avoided altogether. but you should think if and where alcohol fits in the context of your overall health goals. “Aside from calories, alcohol doesn’t offer much by way of nutrition, so it’s at minimum an important decision to have going into any weight-loss program for yourself whether, how often, what type and how much may or may not fit in your timeline and goals,” she says. Alcohol also reduces inhibitions sometimes making it more challenging to make healthy eating choices, according to Dr. Bazilian. And alcohol may negatively impact sleep which plays a role in healthy metabolism, she adds. 
Topping foods with heavy sauces or condiments could add extra calories and often little nutritional value. For example, ketchup often has a high amount of sugar. According to Monica Auslander, a registered dietitian and founder of Essence Nutrition, one teaspoon of ketchup is equal to eating a sugar packet. “It’s deceiving because it has no fat, so people think they can enjoy freely,” she says. “Unfortunately, we now know that sugar is far more insidious than fat.” Fortunately, there are healthier lower-calorie options such as pesto, hummus, and DIY recipes. These are the condiments that are bad for your health.
Once you’re done with your meal prep, make sure you let your meals cool down before transferring them to airtight containers and storing them in the fridge, but make sure you don’t keep your food in room temperature for more than two hours. If you are using meal prep containers and have stored your cooked meal prep well, it can last in the fridge for up to 7 days.  Some foods will keep longer than others, which is something to consider when prepping 7 days at a time.
While 1,200 may be the right number for some, it can be super restrictive for others, says Jaclyn London, MS, RD, CDN, Nutrition Director at the Good Housekeeping Institute. Try basing your meals and snacks off this plan and double up on veggies at any opportunity — more fruit at snack time works too! You can also add an extra ounce or two of protein at all meals if you find yourself feeling hungry. The combo of fiber from produce and lean protein makes this an adaptable strategy that’ll help you lose weight safely — one meal (and snack) at a time!
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