best weigh to lose weight quickly and safely

[BIG H]

Some may say it's not safe, but The Cambidge Diet is a great way to lose Weight & Fat very quickly whilst protecting valuable muscle tissue. You will gain the weight back though unless you are VERY careful.

I fail to see how you can lose fat very quickly whilst protecting muscle tissue. The only way to lose weight very quickly would likely be from seriously dropping calories.....which would result in a severe drop of carbohydrate. The weight loss is likely to be glycogen and water - hence the big drop in bodyweight after only a few days on the diet.

Muscle would obviously be spared due to the lack of carbohydrate.

Unless anybody can enlighten me, i fail to see how these sort of diets preserve muscle tissue. Anyone?

Ketosis is another name for the "fat burning" process. When you start a VLCD (very low calorie diet), during the first one or two days your body uses glucose (a simple sugar stored by the body as the complex carbohydrate glycogen), for its main energy requirements. Once the body has used up its stored carbohydrate, it then switches to its other energy source - unwanted fat. A ketogenic diet is very low in carbohydrate.
The body's stored fat is broken down into little fatty acid molecules called ketones and these circulate taking energy to all the tissues in the body. The Cambridge Diet has been carefully researched and formulated so that when used diets such as Cambridge Diet and Lighter Life, it has just enough carbohydrate for immediate energy and none left over for storage and induces a mild ketosis. The smallest intake of additional carbohydrate can upset this fragile balance and cause carbohydrate to be stored along with water, causing a plateau.
The mild ketosis is an intrinsic part of the design of the a VLCD because it has significant benefits - it is the key to the comfort for the dieter:

• It reduces the feeling of hunger - removing the temptation to err!
• It induces a sense of well-being with good energy levels
  Far from being harmful, ketosis is an important safety factor - the body gets all the energy it needs from the breakdown of its fats stores, thus protecting muscle tissue and vital organs
• Ketones are the products produced by your body when it burns fat. Your body excretes these ketones in the urine and when you breathe out.