State the impact does probiotics have on population group and overall health. 

Probiotics are beneficial bacteria that can help promote overall health and well-being in humans. They have been shown to improve digestion, boost the immune system, reduce inflammation, and even lower cholesterol levels. Probiotics also have a positive impact on population groups such as elderly individuals who may be more likely to suffer from digestive issues due to age-related factors. This is because probiotics can help populate the gut with healthy bacteria which can break down food more efficiently reducing symptoms caused by poor digestion.

Furthermore, research has shown that probiotic supplementation could also help prevent certain illnesses such as colds or flu as these beneficial bacteria act as natural barriers against invading pathogens. Additionally, probiotics are believed to impact mood positively by triggering production of serotonin – a neurotransmitter responsible for regulating emotions such as happiness or anxiety.

Overall, while further research is needed in order to fully understand how probiotics influence human health it is clear that they can provide numerous benefits across all population groups and should be taken into consideration when looking for ways to maintain optimal wellness levels over time.