Ask most nutritionists how often to eat and they will usually respond with the refrain of "a number of small meals per day". Where this idea came from I have no idea, as there is little to no research to support its effectiveness for fat loss or any other goal. This concept has invaded bodybuilding as well, as the usual advice is to eat six or even seven small meals a day to build muscle.
In comparison to the many meals a day idea, you have intermittent fasting – a concept that is not only being confirmed by research but also matches up with our evolutionary heritage. Intermittent fasting is also slowly beginning to filter down to the fitness world and be applied by innovative trainers.
For example, have a look at the "Leangains" website. This trainer is having great success with intermittent fasting as a tool for clients to lose fat and gain muscle. Be sure to view the testimonials section, and look at the results of correctly applied intermittent fasting.
The six meals a day model isn’t dead yet, but it should be and will be as time goes on. People shouldn’t have to force themselves to eat on a set timetable. It takes up too much time and planning, and yields no better results than a flexible meal schedule.