Sorry if this has been asked before but i cant find it on the forum.I am going to up my big training runs from 4 hours to 5 or 6 hours long.Do you eat little and often or wait until you feel your energy levels starting to fall? I'm not sure if waiting until you get hungry will mean having to take on more calories,or if eating little and often will give your stomach too much to do and end up with problems with heart burns or worse.