Why keeping the gut moving is essential for effective Parkinson’s management

I am not sure how many of you watch Prof Bas Bloem's weekly videos or podcasts that we share here on Parkinsons Insights below. These are absolutely golden nuggets where Prof Bloem answers audience questions. I highly recommend them. Last week, Prof Bloem answered a question about constipation and explained that managing it is often viewed as a matter of personal comfort, but it is actually a critical component of effective treatment for Parkinson’s. For many people, the condition may actually start in the gut—a concept known as the "body-first" hypothesis. However, even if it begins elsewhere, the digestive system is almost inevitably affected, making slow bowel movements the rule rather than the exception. The impact of a sluggish gut goes far beyond physical discomfort, bloating, or pain. Ongoing research suggests that chronic constipation can alter the balance of bacteria in the digestive tract, leading to a condition called Small Intestinal Bacterial Overgrowth (SIBO). When these "wrong" bacteria flourish, they can actually begin to break down Levodopa before it ever leaves the gut. This means a significant portion of oral medication can be lost, never reaching the brain where it is needed. This interference explains why some people experience "delayed ons," where medication takes a long time to kick in, or "dose failures," where certain doses seem to have no effect at all. For roughly 5 to 10 percent of people, the gut may act as a total biological barrier, preventing even the most fundamental treatments from working satisfactorily. To ensure medication works as intended, maintaining regularity is essential. Prof Bloem suggests several practical strategies to keep the system moving. A diet high in fibre is the first line of defence, paired with significant hydration. Aiming for two litres of fluids every day is vital; a helpful tip is to fill two one-litre bottles and place them in a visible spot to ensure they are finished by the evening. Physical activity also plays a key role, as regular exercise helps naturally stimulate the digestive tract. If these lifestyle adjustments are not enough, it is important to consider the use of laxatives or, in more severe cases, an enema to clear any obstructions that prevent the passage of stool. By prioritising gut health, it is possible to remove the barriers that hinder medication and improve overall daily management of the condition.