An area which is always neglected when looking at nutritional gains is the health of your gut. If you don't have a healthy digestive system this can affect your immune system, performance and how you absorb nutrients from food.
For young people this won’t be such an issue, but those older people who haven’t eaten well or have put their body under stress could look at trying a high-end probiotic to help fix and repair your gut.
The internationally endorsed definition of probiotics is live microorganisms that, when administered in adequate amounts, confer a health benefit on the host.
Other definitions advanced through the years have been restrictive by specification of mechanisms, site of action, delivery format, method, or host.
Probiotics have been shown to exert a wide range of effects. The mechanism of action of probiotics (e.g., having an impact on the intestinal microbiota or enhancing immune function) was dropped from the definition to encompass health effects due to novel mechanisms and to allow application of the term before the mechanism is confirmed.
Physiologic benefits have been attributed to dead microorganisms . Furthermore, certain mechanisms of action (such as delivery of certain enzymes to the intestine) may not require live cells.