What Causes Elevated Liver Enzymes?

Hi doctor, for about two months I have had problems with my bowels. They have slowed down, and I was experiencing constipation. I eat healthily and was active. The past three weeks the symptoms have worsened. I have had a CT scan done and an MRI along with blood work and also a colonoscopy. The CT scan, MRI, and Colonoscopy all came back negative. The only thing that was abnormal was my liver enzymes in the blood. They were elevated, over the course of a week they did improve but were still above averages. I believe this was because for a week I had a liquid only diet of soups and smoothies, which really helped my stomach and made me feel normal again. When I attempt to eat solids I feel overly full and like I need to defecate, but my bowels don t come out easily. I have no clue what could be the problem.