I wake up early and eat before some of the fasts start. I learnt that one cannot start eating mezonos or bread within half an hour of amod haschar. If I has a shomer to remind me to daven is it permissible. Thanks
Yes it is permitted, however the person has to be there or at least availible to actually remind you that you have to stop eating before alos. Just remember to stipulate before going to sleep the night before that you are still going to eat.