If u don't eat anything with bulk. like if u eat always soft food. will that cause bms to be soft loose mushy.

NO: Eating processed food which can be soft and mushy and contain no fiber can still lead to constipation. Its not so much the consistency of the food that leads to a well formed bowel movement as it is the fiber and fluid content. There are other conditions such as anxiety and fat absorption problems that can lead to looser stools. If loose stools persist, you might discuss with your physician.