This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
Small pieces of bowel movement suggests lack of cohesion force due to the lack of dietary fibers and fluids.
So, you will need to add bulking agent to your diet.
.Foods high in fiber include vegetables, fruits, nuts, legumes (beans, peas and lentils), whole-wheat flour and wheat bran.Initially you should cook your vegetables well to make the fibers soluble for easy digestion.
Methylcellulose also can be taken daily to help with your bowel movement.
Now there can also be intestinal infection with bacteria or parasite.
This should be checked with stool tests.
Colon polyps, diverticular disease are other possibilities better evaluated with colonoscopy.
Please also include prebiotics like Inulin daily to keep your colon acidic which prevent gas producing bacteria.
Also take a probiotic ( lactobacilli, bifidobacterium) daily to restore intestinal microbial balance.
Culturelle 30 Counts twice daily should be fine.
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