FOR LESS CONDITIONED ATHLETES, UNTRAINED INDIVIDUALS OR THOSE EXERCISING ABOVE 65% VO2 MAX, HIGH FAT DIETS HAVE NO PERFORMANCE ADVANTAGE (Burke 2004; Erlenbusch 2005).
So don't follow a trend just because someone says it's the only way; trust your intuition and follow a plan that suits your needs. It is best to sticking to timing and weighing all of your macro nutrients to suit your body type (carbs, fats and protein) and around the times you train and the type of training you do. Nutrition is like fashion- just because someone with credibility says it is in fashion, it doesn't mean you should wear it, or that it will suit you.
Numerous studies have scientifically tested whether a high fat diet might enhance the muscles' ability to burn fat. The thinking behind this makes sense seen as fat is a major fuel source during prolonged endurance exercise; a high fat diet may be able to 'train' the muscles to burn more fat during exercise, conserving glycogen and giving muscles greater access to fat as a fuel source, which we have in greater supply than glycogen.
Results of such research has shown that increasing fat intake enhances the storage and burning of intramuscular fat. HOWEVER, such studies (Muoio 1994; Helge 2001; Lambert 1994; Burke 2004) show this only rings true of elite or well-conditioned athletes- and the performance advantage only applies at relatively low exercise intensities. FOR LESS CONDITIONED ATHLETES, UNTRAINED INDIVIDUALS OR THOSE EXERCISING ABOVE 65% VO2 MAX, HIGH FAT DIETS HAVE NO PERFORMANCE ADVANTAGE (Burke 2004; Erlenbusch 2005).