Carbohydrates are the body's main source of energy. In their absence, your body will use protein and fat for energy. It will cannibalise itself. There are even carbs in dairy, carbs in every form of plant matter on the planet. Everything that grows photosynthesis light energy into carbohydrates, which we then consume. You do not need refined carbs as in rice, pasta and other processed foods. But if you have zero carbs you eventually be dead. After several months you will be severly vitamin deficient and your body is under constant stress to convert lipids and triglycerides for metabolic function. No one has a zero carb diet, they have a reduced-carb diet like that Atkins crap. You still have to have vegetables and fruit you fuckwit otherwise your body is continually going through ketosis. Fat is also energy which is then converted into glucose for metabolic function. Your liver and muscles store glucose in the form of glycogen, a carbohydrate. People who have a "zero" carb diet are actually on a restrictive carb diet. Tell me exactly what you ate today and I guarantee you consumed carbs with absolute 100% certainty.