Hi and welcome to the forum! I am glad that I can help you.
You want to know the cause of the symptoms that you experience.
Liquid food like soups and drinks (especially those with great amounts of sugar) may increase the peristalsis and provoke bowel movements. There is also a medical condition called irritable bowel syndrome (IBS) in which constipation or diarrhea can be predominant. Its diagnosis is based on excluding other medical conditions that are characterized by diarrhea. IBS is characterized by abdominal pain, urgency for a bowel movement, tenesmus, bloating and abdominal distension.
According to the data that you described, you may or may experience a frequent need to defecate due to possible IBS. See a gastroenterologist to exclude possible gastrointestinal infections, celiac disease and fructose malabsorption.
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