You would have to go to an all liquid diet. Any solids you put into your body are excreted as feces for the portions of the solid that cannot be processed. On an all liquid diet you will still piss out of your ass for a few days till your intestines are clear.

Eating a strict carnivore/keto diet can reduce your average fecal volume by over 70%. The HCL in your stomach almost completely breaks down meat whereas plant foods end up fermenting in the gut which leads to more feces.

Eating lots of carbs will literally make your body full of shit.

There is a condition known as leaky gut. I'm not sure of the symptoms. Eat oatmeal in the morning. It keeps moving at a good pace all through the day.

Wouldn't excrement leaking from your bowels lead to sepsis? I don't think you would have more than a few days before you died without medical attention.

I have experienced less fecal volume when I was substituting one meal a day with whey protein. I would bet on your diet being a factor.

Thanks for all of the high quality posts, and nice fecal fixation.