Clinical Practice in Colombia Confirms Risks of Prolonged Senna Leaf Consumption

Clinical observations in Colombia shed light on the perils of extended senna leaf consumption. Credit: Valeria Peña, Unimedios. Many individuals regularly use senna leaves as a laxative or for weight loss purposes. However, academic research indicates these leaves do not aid in fat reduction. Instead, their effects include significant water and electrolyte loss, and prolonged use can harm the liver.

This was proven through a clinical practice conducted by Pharmacy students from the National University of Colombia (UNAL) at La Samaritana University Hospital in Bogota. The students examined the case of a 58-year-old woman who, attempting to lose weight, drank senna leaf infusions for nearly a year. The woman had pre-existing conditions such as type 2 diabetes mellitus, high blood pressure, and overweight.

"She could easily obtain senna leaves from a market square," explained Mariana Contreras Garcia, a final-semester Pharmacy student at UNAL, as reported by Unimedios. She and her classmate Maria Jose Rocha Vanegas were conducting their clinical practice together. The Essential Mechanism Lies in Colon Function The woman did lose weight, but at a considerable risk.

Senna leaves contain compounds called anthraquinones, which act as laxatives when they reach the large intestine. These compounds stimulate bowel movements and alter water and electrolyte absorption. The result is not fat burning but increased water volume in the colon, softer stools, and more frequent bowel movements. Professor Ilvar Munoz Ramirez of UNAL's Department of Pharmacy explained that the prolonged laxative state causes fluid and electrolyte loss while hindering proper food absorption, leading to gradual weight loss.

The chemical process begins when the constituents of the senna leaves reach the colon. "Senna functions as a stimulant laxative," noted student Rocha. "Intestinal bacteria convert its components into active substances that set the intestine in motion, modifying water and electrolyte handling and increasing colonic motility due to nerve endings stimulation."

This leads to softer stools and more frequent bowel movements. On the one hand, these substances stimulate nerve endings involved in intestinal contractions. On the other hand, they reduce water and electrolyte absorption, allowing more to remain in the colon. The Resulting Impact Extending beyond its use as a laxative, senna consumption can cause severe liver damage with chronic use.

Rocha observed that some plant metabolites are highly reactive and can negatively impact hepatocytes, the primary liver cells responsible for processing nutrients, detoxifying substances, and producing necessary proteins. If this damage persists over time, it can compromise liver function. Consequently, chronic consumption of senna leaves can lead to serious liver damage.

The patient at the time of the clinical encounter had already been diagnosed with liver cirrhosis, a liver lesion, and there were concerns about the development of hepatocarcinoma, a malignant tumor in the liver. While the clinical case does not definitively prove that senna consumption directly caused these conditions, the prolonged usage history was a significant factor in the patient's medical history.

The woman was discharged and awaiting further medical examinations, including a biopsy, to determine the nature of her liver lesion. This case emphasizes the importance of healthcare providers in Colombia, where medicinal plant use is deeply ingrained in culture, to consider patients' traditional plant consumption habits explicitly.

Student Rocha highlighted the necessity for pharmaceutical chemists to recognize that, despite plants being natural products, they can still pose health risks.