Very-low-calorie diet - Wikipedia
https://en.wikipedia.org/wiki/Very-low-calorie_dietA very-low-calorie diet (VLCD), also known as semistarvation diet and crash diet, is a type of diet with very or extremely low daily food energy consumption. Often described as a fad diet, it is defined as a diet of 800 kilocalories (3,300 kJ) per day or less. Modern medically supervised VLCDs use total meal replacements, with regulated formulations in Europe and Canada which contain the recomme…
Very low calorie diets - NHS
www.nhs.uk › very-low-calorie-dietsVery low calorie diets are less likely to be nutritionally complete as they provide far fewer calories than needed to maintain a healthy weight. The recommended daily calories are 2,500 for men and 2,000 for women. It is not an easy diet to follow. Side effects can include: feeling hungry feeling low on energy a dry mouth constipation or diarrhoea