The diet formula is intended to harness "the excellent weight loss properties of starvation", while providing enough protein to protect lean tissue, the right level of carbohydrate to promote a mild ketosis (the body's fasting mode, which burns body fat) and eliminate a sense of hunger, and the right levels of vitamins, minerals, trace elements and essential fatty acids to maintain good health. The meals are intended to combine all necessary food groups to satisfy a body’s nutritional needs, in order to allow a person to stop craving foods and overeating.
The company recommends eating only three of their pre-packaged meals a day (a total of 500 calories or less), for the fastest weight loss, or combining their meals with some regular food for more gradual weight loss. The food consists of nutrition bars, shakes, soups, or formulas in various flavors. Cambridge also recommends at least eight glasses of water a day.
The diet discourages alcohol, chewing gum, and high-energy exercises while on this diet.