Some of the symptoms were discussed earlier in the thread.
The body experiences a new condition when a person goes on the low-carbohydrate diet. The more commonly used glucose fuel is no longer available. The body reacts by dropping the pancreas' production of insulin and increasing the hormone glucagon. The glucagon draws stored fat reserves in the form of triglycerides for use by the cells as the new energy source. However, the cells are slow to react to this new fuel source, and the individual--CAN feel weakness or a lack of energy. The resistance to burn fatty acids for energy can vary greatly between individuals. Some people feel this weakness, BUT others pick right up and take off with the feeling of greater energy than before.
The liver begins to catabolize (break down) the extra fatty acids which are not being utilized by the cells. However, the liver does not have the enzyme necessary for complete catabolism of the fatty acids. This causes the discharge of the ketone molecules into the blood. The strange taste in the mouth and mild breath odor shows the presence of these ketones. Other body cells can utilize the ketones for energy. The brain can also utilize ketones contrary to the myth that the brain must be powered by glucose only; although, some areas of the brain still require glucose, which the body makes from amino acids or fats.
The body begins to utilize the fatty acids for energy more efficiently after a few weeks and the ketone level drops to normal. This does not mean one is not losing weight. It means the body is becoming a more efficient fat burner.
Source:
(I dont agree with everything on this site, but the article is basic in some explaination)
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