The Slimfast 3-2-1 approach to dieting is based on portion control and meal replacements. Each dieter is allowed 1200 calories per day, comprised of any combination of the 3-2-1 components.

The 3-2-1 approach:

Three 100 calorie snacks
Two Slimfast shakes or meal replacement bars
One 500 calorie balanced meal

According to Slimfast, a balanced meal is comprised of 50% vegetables, 25% lean protein, and 25% whole grains or other complex starch. Slimfast has its own line of shakes, meal replacement bars, and snacks that are said to include vitamins, minerals and fiber. The objective is to avoid overeating by satisfying hunger and cravings throughout the day. This helps boost metabolism and maintain energy levels while providing structure and discipline.

The Slimfast Diet is in line with the 2005 Dietary Guidelines and implements a method that appeals to individuals who enjoy having quick meal replacement and snack options that require little thought and preparation. Weight loss is a gradual process and is approximated at one to two pounds per week. The Slimfast website is user-friendly and has a support network of Registered Dietitians available to answer questions and provide guidance.

Foods to include:

Vegetables
Fruits
Whole grains
Lean meat
Lean poultry
Fish
Beans
Non-fat dairy
Nuts and seeds
Healthy oils
Slimfast bars and shakes

Foods to avoid:

Refined grains
High-fat meat and poultry
Full-fat dairy
Eggs

Pros:

Convenient grab-and-go options
Encourages portion control
Requires little planning
Calorie calculations are done for you

Cons:

Not suitable for those with soy allergies or lactose intolerance
Meal replacements may become monotonous
Most Slimfast items are highly processed and contain chemicals

Sources:

Slimfast www.slimfast.com
Slimfast Diet www.health.usnews.com