Consuming fewer calories is the fastest way to jump-start a weight-loss plan. Under normal circumstances, a gradual weight loss of 1 to 2 lbs. per week is the ideal target, according to the Centers for Disease Control and Prevention. But sometimes faster weight loss is necessary. Diets referred to as very low-calorie diets are used to accelerate weight loss.
How They Work
Very low-calorie diets are doctor-prescribed and supervised plans that help those who are obese lose weight fast. This diet consists primarily of liquids and meal replacement shakes or bars. Some physicians recommend a high-protein very low-calorie diet consisting of lean proteins like fish and chicken. These diets permit only 800 or so calories per day, according to the Weight-Control Information Network, a division of the National Institutes of Health.
Who are They for?
Very low-calorie diets are designed exclusively for those with a body mass index greater than 30, according to the Weight-Control Information Network. For reference, someone who is 6 feet tall and weighs 225 pounds has a BMI of 30.5. It may also be a weight-loss option for someone with a BMI of 27 to 30 who has high-blood pressure or other medical condition. A very low-calorie diet under 1,000 calories per day may not be ideal for anyone 50 or older, according to the Weight-Control Information Network. Those who are older may have medical conditions or special nutritional needs. Doctors evaluate the safety of the diet on a case-by-case basis.
Potential
The weight-loss potential of the very low-calorie diet is extremely high, compared with traditional low-calorie diets of 1,200 calories and up. According to the Weight-Control Information Network, the average weight-loss of participants is 3 to 5 lbs. per week. Over the course of 12 weeks, it's not uncommon for participants to lose about 45 lbs. These weight-loss plans are designed for quick, short-term results, and they are not a long-term weight-loss solution. The diet typically last for less than six months. After that, your doctor will probably recommend a 1,200-calorie diet if you are a woman and a 1,600 calories if you are a man.
Risks
Minor symptoms, including fatigue, nausea and diarrhea, are common during the first four to 16 weeks. These symptoms usually improve in a matter of weeks. Gallstones are also common in those who lose weight quickly. This is caused by an increase in cholesterol in the gallbladder. Medication can control these symptoms. Your doctor will want to see you at least once every two to three weeks to monitor your progress and treat any symptoms caused by the rapid weight loss.
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