Several of the experts Live Science contacted for this article said they would not recommend a low-fat diet. This is because the body needs fat. “If you eliminate fat too much, it can have serious health consequences,” said Jennifer Fitzgibbon, a registered oncology dietitian at Stony Brook Hospital Cancer Center in New York. “Mental health deficits like depression and vitamin deficiencies can occur. The vitamins A, D, E and K are fat soluble, meaning the body stores them in fatty tissue and the liver. The intestines need dietary fat to properly absorb these nutrients. These vitamins are also necessary for the health of your skin, bones and cardiovascular system, among other organs and systems,”
Also, some fats are very healthy. For example, omega-3 fats from fish, flaxseeds and walnuts have many health benefits. Other “good fats” include monounsaturated fats found in extra virgin olive oil, olives, avocados, coconut oil, nuts and seeds, according to the University of Michigan. Other fats may not be so bad, either. “Interestingly, it appears more and more that perhaps saturated fats like butter, cream and other types coming from animals are not as harmful as we once thought,” said Liz Weinandy, an outpatient dietitian at the Ohio State University Wexner Medical Center. “We will have to let science sort that out and we’ll know more in the next few to several years.”
Source [http://m.livescience.com/52851-low-fat-diet-facts.html]