I hope this helps - but I've just had a doctors appointment this morning for the evils that is my constipated bottom! 
I wanted to share what she said in case it helps anyone else.
Did you know that one of the most common causes of constipation is the fact that we don't allow us enough time to sit peacefully and relaxed on the toilet as soon as we get the 'urge'?
We hold it in because we don't have time, or we are at work, or shopping in Tesco - and by the time we get home and sit on the toilet, our bowels are frozen/gone to sleep and... we push, strain and struggle but... nothing happens!
And then we go through the same the next day... and the next day...
So let's make in a board rule - as soon as you get that 'urge' ... go!!!! Hopefully then we will all be less constipated!
What do you think? Sound like a plan?