The restriction of fat intake in dieting has been a long standing principle used for weight loss and weight control. Biochemically speaking, fats are the most precious energy reserve in the body. This is due to the fact that it has the highest energy (or caloric) value. Aside for being more efficient in energy generation, fat is stored on the body without water, so it does not weigh as much as protein (muscle). So a human can have more energy stores and carry less weight with fat than with any other source of energy.

“The interesting thing about fat is that the body can actually build fat out of excessive consumption of carbohydrates or protein. Once carbohydrates or protein are converted to fat, they can not be converted back. So it can be very difficult to loose the fat once it is stored. This is why some ‘non fat’ diets are not effective. If you eat too much protein or carbohydrate, they will fill the reserves initially and then the body will convert the extra calories into fat!”

(http://www.weightawareness.com/topics/doc.xml?__topic_id=111&doc_id=1279)

“Hello all,

Was searching through some of the posts and found this one, I found some of its contents a tad extreme so I thought I’d pass comment.

Lowering your body weight below 5% (from 10-4%) would not be recommended, anything lower than this and you would be jeopardising fat levels your body requires for normal daily functions. Fats comprise hormones, store vitamins, and play vital roles in immune function etc so should not always be viewed as the enemy.

Restricting your caloric intake to 900Kcals would also not be recommended (compare this to the caloric intake of pro soccer players which research has shown is around 3,000Kcal). As mentioned in an earlier post you simply wouldn’t have the energy to engage in exercise and maintain healthy bodily functions. Another important point to make is that you would be using lean tissue (ie muscle) as an energy source, which would have a negative impact upon sports performance, your aesthetics and health.”

(http://www.pponline.co.uk/forum/talk-performance/lowering-body-fat-as-quickly-as-possible)

i seriously doubt you are 2% body fat. the world record was 2%. i suggest you go to a doctor to get this accurately measured. back to the original question, ‘yes’ not having enough fat in your diet is unhealthy, the reason for this is because you need to eat fat for lubrication of your internal organs. however having 2% body fat itself isn’t unhealthy if you are that lean due to exercise and have good muscle development. the fat we carry around our midsection and on other parts of our body is no use to us, other than to keep us warm. just make sure that you are eating enough fat in your diet for your internal organs sake.

(http://answers.yahoo.com/question/index?qid=20110114155252AA3hwSe)

so pretty much if you have no fat you will have no energy, therefore if you have no energy you would not be able to do anything, and you would get sick from such a low fat percentage. 2% is the lowest recorded body fat percentage and all pro bodybuilders never try to go below 4% and they only stay there for about a week, then they start loading on the fat again to gain more muscle. there is absolutely no way you are below 1% body fat, you wouldnt even be able to run a mile.