Probiotics as a Potential Infection Prevention Method for the Elderly
Understanding Probiotics
Probiotics are frequently promoted as a natural remedy for various health issues. A recent study explored the potential of probiotics in preventing infections among older adults. Infections pose a greater risk to seniors, who may experience two to five infections annually. Common types include respiratory tract infections, influenza, and digestive or urinary infections. While there are medications available for infection prevention, they often come with high costs and possible side effects, prompting healthcare professionals to seek alternative preventive measures.
The Role of Probiotics
Probiotics are beneficial microbes, often misunderstood as harmful. Certain bacteria, known as probiotics, can enhance health. These live cultures, found in probiotic supplements, aim to replenish the beneficial bacteria in the digestive system. Research indicates that probiotics may help mitigate health issues in older adults, including bone loss.
While numerous studies suggest that probiotics can prevent infections in children, the evidence for older adults remains inconclusive. Some research supports the idea that probiotics can reduce infection rates, while other studies show no significant impact.
Research Overview
A team of Brazilian researchers sought to clarify the effectiveness of probiotics in preventing infections in older adults. They systematically reviewed randomized controlled trials (RCTs) focused on this topic, with their findings published in the journal *Age and Ageing*.
Significance of Randomized Controlled Trials
Randomized controlled trials are considered the gold standard in medical research due to their two key features: comparing a new treatment against a control (placebo or existing treatment) and randomly assigning participants to treatment or control groups. This design enhances the reliability of results.
In their analysis, the researchers identified 15 RCTs that evaluated the efficacy of probiotics in preventing infections among older adults. These studies compared a group receiving probiotics with a placebo group, tracking infection rates, including respiratory infections and diarrhea caused by Clostridium difficile. Nearly 6,000 participants, predominantly over 65 years old, were involved.
Findings on Probiotic Efficacy
The results revealed that only two out of the 15 studies indicated a reduction in infection risk due to probiotics. The majority found no significant effect on infection rates, nor did probiotics help participants recover from infections more quickly. A limited number of studies assessed mortality rates or quality of life, showing no impact from probiotics. However, no serious side effects were reported.
Concerns Regarding Study Quality
The researchers evaluated the quality of the studies included in their review. Ideally, RCTs should provide comprehensive details about their protocols, but many fell short in this regard. Additionally, a significant number of participants withdrew from these studies or were excluded from the final analysis, potentially undermining the reliability of the findings.
Another concern was the funding sources for many studies, which were often supported by companies that market probiotics. This financial connection raises questions about potential bias in the results.
Conclusion on Probiotics and Infection Prevention
In conclusion, the review found no convincing evidence that probiotics are effective in preventing or treating infections in older adults. Conversely, there was no indication that probiotics caused any harm or serious side effects. However, the safety of long-term probiotic use in older individuals, particularly those who are critically ill, has not been thoroughly studied. There is a clear need for further research to explore the impact of probiotics on the quality of life for older patients.
Written by Bryan Hughes, PhD
Reference: Wachholz, P. A., Nunes, V. d. S., Polachini do Valle, A., Jacinto, A. F. & Villas-Boas, P. J. F. Effectiveness of probiotics on the occurrence of infections in older people: systematic review and meta-analysis. *Age and Ageing* 47, 527-536 (2018)