I try to drink the fresh juice of beef,tomatoe and carrot juice 3 cup daily.Before juicing,My bowel movement is very good.one time per daily.But after juicing one month,I feel constipation.one time per two or three day.constipation lasts one month.what can I do?I have drunk plenty of water ,many vegatables ,fruits.I also try use some supplyment fibre powder. The constipation situation does not change.what can I do?