What is a common outcome of fat malabsorption, as seen in A-B lipoproteinemia?

A common outcome of fat malabsorption, as observed in conditions like A-B lipoproteinemia, is diarrhea. This occurs because the body is unable to properly absorb dietary fats in the intestines due to a deficiency in certain lipoproteins responsible for transporting fat. When fats accumulate in the intestines rather than being absorbed, they lead to osmotic imbalances that can result in diarrhea. The undigested fat can also irritate the intestinal lining, contributing to loose stools and increased bowel movements.

In contrast, constipation, nausea, and weight gain are not typical outcomes associated with fat malabsorption. Constipation often results from low fiber intake or dehydration rather than fat absorption issues. Nausea might occur for various reasons but is not specifically linked to the inability to absorb fats effectively. Weight gain would usually be associated with excess calorie consumption rather than malabsorption, where the opposite effect is typically seen, leading to potential weight loss instead.