Can protien cause constipation,or small amount of dairy,or ensure cause it? what foods can cause constipation?

Absence of fiber...: ...is probably the big issue here. But, to answer your question about foods that have a binding effect, you may want to minimize: chocolate (particularly if you have Irritable Bowel Syndrome), large amounts of dairy (milk, cheese), red meat, bananas (& other high pectin foods), caffeine (particularly if you're already dehydrated).