Magnesium also keeps me regular. I have to have a lot, at least 800 mg a day, prescribed by neurologist for spasm and jerks. This automatically removed my years of constipation.
In fact, sometimes must eat blackberries to slow it down (blackberries are only fruit that does this, to my knowledge).

On the other hand, the food which I find is most helpful in removing constipation is canned pears. I don't know about fresh pears. Canned ones I have used on those rare
occasions when I have constipation now. I had a blocked bowel several times in the years before magnesium, so I know what it is! Took medical intervention a few times.