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.
This popular diet program is fairly restrictive — and for the first 30 days, dieters must cut out grains, legumes, most dairy, added sugar, and alcohol without any slip-ups, according to the Whole30 website. (29) The aim is to “reset” your body and to adopt dietary habits resulting in weight loss. Cutting out added sugar and alcohol has merit, but all the restrictions prove challenging and could lead to nutrient deficiencies and disordered eating.

The scale is not necessarily your friend. You may want to lose fat – but the scale measures muscles, bone and internal organs as well. Gaining muscle is a good thing. Thus weight or BMI are imperfect ways to measure your progress. This is especially true if you’re just coming off a long period of semi-starvation (calorie counting), as your body may want to restore lost muscles etc. Starting weight training and gaining muscle can also hide your fat loss.


"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.
Start with 40 grams of Net Carbs of carbohydrates a day. Net Carbs represent the total carbohydrate content of the food minus the fiber content and sugar alcohols (if in the product). The Net Carbs number reflects the grams of carbohydrate that significantly impact your blood sugar level and therefore are the only carbs you need to count when you do Atkins.
If you do it right, snacks also make a healthy contribution to your weight-loss plan. Keep them snack-size and know ahead of time when you're going to eat them, such as in between lunch and dinner or after dinner. Keep snack calories to 200 or less. Good options include 2 cups of air-popped popcorn tossed with 12 peanuts; a container of nonfat yogurt with 1/2 cup of unsweetened whole-grain cereal; 2 cups of raw veggies such as broccoli, cucumbers and carrots with 1/4 cup of hummus; or 1 tablespoon of almond butter with a small apple.
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.
The 3 Day Diet is low calorie, but it certainly is not low-fat, low-salt, or low cholesterol, so it is not a healthy option for most people with certain medical conditions such as diabetes, hypertension, heart disease, and high cholesterol. If you are overweight, weight loss is key to managing these conditions. But it should be a healthy and sustainable weight loss that includes healthy nutrition and exercise.
Your habits and cravings may both rear their heads at restaurants, where it's easy to blow your diet in seconds. To stick to the plan, says Juge, be diligent in ordering. "Ask them to grill your meat without oil or grease. Ask for steamed vegetables with no butter. Get a salad (no cheese) with either fat-free dressing or a vinaigrette." After his 14 years in bodybuilding, Juge testifies that he's found many restaurants are accommodating, so there's no reason to avoid them as long as they'll cook to your preferences.
We’ve now arrived at tip number 16. If you’re still having trouble losing weight, despite following the 15 pieces of advice listed above, it might be a good idea to bring out the heavy artillery: optimal ketosis. Many people stalling at weight plateaus while on a low-carb diet have found optimal ketosis helpful. It’s what can melt the fat off once again.

Plan your meals ahead of time so you make healthy choices. When dining out, check the menu online and decide what you will order ahead of time. Ask for dressings on the side and opt for foods that are baked, broiled or steamed versus foods that are fried or in creamy sauces. Avoid the chips and bread baskets that can add unnecessary calories to a meal.
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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