If i have weight loss, loose stool, and low bicarbonate, (sodium bicarbonate) does#3 cause #1?

Malabsorbtion: Chronic diarrohea is causing bicarbonate (sodium bicarbonate) loss in stools and lowering serum bicarbonate (sodium bicarbonate) multiple causes such as pancreatic insufficiency this can have serious implications and needs work up directed and brought to corrective treatment.

Malabsorption: You need work for celiac disease, ibd and pancreatic insufficiency. Easy start could be stool for cell count, fat and split proteins and celiac panel. Good luck.