Plenty of water, fats/oils, fibre from sources such as vegetables, some fruits, nuts, flax seed, and time for you body to adapt to your new diet.
I found that the first few weeks on my LCHF diet were a bit of a problem constipation wise, but once my body got used to its new way of eating it was much easier. I still find though that if I'm not eating enough fibre/bulk or drinking enough, I'm a bit more likely to get a bit "bunged up".
Robbity
Robbity