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Very low-calorie diets (VLCDs) are structured eating plans designed to provide significantly fewer calories than a typical diet. They are sometimes used as part of a structured weight-loss programme, often using specially formulated meal replacement products.
But how do VLCD diet plans actually work, and what makes them different from simply eating less?
A very low-calorie diet generally refers to a diet providing 800 calories or fewer per day. This is considerably lower than the calorie intake of most adults. Because calorie intake is so restricted, a VLCD is not simply a matter of choosing smaller portions of ordinary foods.
Structured plans often use meal replacement products such as shakes, soups, meals and bars to make it easier to control calorie intake while providing a planned balance of nutrients.
Very low-calorie diets are not suitable for everyone. Anyone considering a VLCD should check whether it is appropriate for them and follow the relevant product and professional guidance.
The basic principle is the same as other weight-loss approaches: reducing calorie intake can create an energy deficit. When the body receives fewer calories than it uses, it needs to draw on stored energy. Over time, this can result in weight loss.
A VLCD creates a relatively large calorie deficit, which is why it can lead to substantial weight loss. However, the focus should not simply be on consuming as few calories as possible.
With such a low calorie intake, nutritional composition matters. A properly structured plan needs to take nutritional requirements into consideration rather than simply cutting out food.
The exact structure depends on the particular programme and products being used. Some plans may involve replacing most meals with specially formulated products, while others may introduce conventional food alongside meal replacements at particular stages.
A typical day could therefore include several portions of meal replacement products, such as a shake for breakfast, soup for lunch and another meal replacement for dinner, alongside appropriate fluids and any other foods specified by the plan, such as salad and vegetables.
It is important to follow the instructions provided with the particular plan rather than assuming that all VLCD products can be combined in the same way.
The terms are sometimes used interchangeably, but they are not exactly the same. A low-calorie diet generally involves reducing calorie intake without going as low as a VLCD. A very low-calorie diet typically means consuming 800 calories or fewer per day.
This distinction matters because a very low calorie intake places greater emphasis on nutritional adequacy and appropriate planning. A VLCD should therefore not be approached as simply an extreme version of everyday calorie counting.
For some people, structure can make a weight-loss plan easier to manage. Instead of deciding what to eat at every meal, a structured programme provides defined options and portions. This can be particularly helpful for people with busy lifestyles.
The downside is that a VLCD can be restrictive. It may not suit everyone's lifestyle or preferences, and following a very low-calorie plan requires more consideration than simply choosing lower-calorie foods.
The right approach is the one that is appropriate, nutritionally considered and realistic for the individual.
A VLCD is a significant dietary change and is not suitable for everyone. Certain health conditions, medications, pregnancy and other circumstances can affect whether this type of diet is appropriate.
If you are considering a VLCD, it is sensible to check the guidance provided by the plan and seek advice from a suitably qualified healthcare professional if you are unsure whether it is right for you.
It is also important to follow the instructions for any meal replacement products you use and avoid assuming that eating fewer calories than recommended will produce better results.
Very low-calorie diet plans work by creating a substantial calorie deficit while using structured food choices to help manage calorie intake and nutritional requirements.
For people who find conventional calorie counting complicated, meal replacement products can provide a simple way to create structure and control portions.
For those considering a structured low-calorie approach, understanding how VLCDs work is an important first step towards making an informed decision.
