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.
Developed by Joel Fuhrman, MD, a nutrition expert and researcher, this book-based diet plan is all about nutrient density: Eat the foods that have the most nutrients per serving (and per calorie), and you will be healthier overall and lose weight. Dr. Fuhrman’s 10-in-20 Plan claims you’ll lose ten pounds in 20 days. This produce-focused program has you eliminate all processed foods, dairy, sweeteners, and oils, which some people complain is too restrictive. There’s also an online component that offers membership with a community of nutritarians. Don’t miss these other 50 ways to lose weight without a lick of exercise.

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.
You will likely lose weight on any diet if you eat less than 910 calories a day. But losing 10 pounds in 3 days is both unlikely and unhealthy. To lose just 1 pound of body fat, you need to reduce your daily calories by about 500 a day for a whole week. That’s giving up 3,500 calories over the course of 7 days. To lose 10 pounds in 3 days would mean decreasing your calorie intake by 35,000 calories in just 3 days! The Academy of Nutrition and Dietetics recommends a slow and steady weight loss of no more than 1/2 to 1 pound a week. Otherwise you are losing muscle and water, as well as weakening your bones. You also are much more likely to gain it all back.

High blood sugar levels coupled with high blood ketones, on the other hand, will mean that you have a pathologically low level of insulin – something non-diabetics do not suffer from. This can lead to ketoacidosis – a potentially life-threatening condition. If this happens, you’ll need to inject more insulin; if you’re at all unsure of what to do, contact a medical professional. Coveting really high blood ketones for weight control is not worth the risk for type 1 diabetics.
Keep in mind that the first time that you sit down and plan meals to lose weight the process will take a little longer. But once you have a system in place, you'll breeze through the ritual—you might even start to enjoy it. Getting organized feels good and reaching your weight loss goals feels even better. So take enough time to follow through with the prep steps to get used to your diet plan and stay on track. 
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.

Before you start the meal plan, make a pot of the Veggie Soup. Make 2 servings of Overnight Oats, so they can soak in the fridge. It’s also super helpful to prep your veggie snacks—make 4 bags filled with baby carrots and sugar snap peas, and 3 bags filled with broccoli and cauliflower, for alternate days. And if you really want to get ahead, you could also grill the chicken breasts and cook the quinoa and brown rice in advance.
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