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It’s tempting to simplify things. As we get older, we “digest less well.” Almost inevitable. Almost obvious. And yet, that idea is misleading. It’s not age itself that alters digestion, but a series of biological functions that gradually shift over time—often silently.
In other words, the issue isn’t the passage of time. It’s what changes in the background, without us noticing.
Digestion isn’t a single, uniform process. It’s a sequence of coordinated steps, each relying on specific mechanisms: enzyme secretion, gastric acidity, pancreatic function, microbiome activity, and the integrity of the intestinal barrier.
When everything works properly, these mechanisms remain invisible. But when one or more of these links becomes less efficient, digestion changes—sometimes subtly, sometimes more noticeably.
One of the first shifts concerns pancreatic function. The exocrine pancreas is responsible for producing digestive enzymes essential for breaking down proteins, fats, and carbohydrates. Several studies have shown that with advancing age, this system can become less efficient—even in the absence of overt digestive disease.
A major systematic review describes structural changes such as atrophy, fibrosis, and reduced pancreatic perfusion, all associated with a progressive decline in exocrine function [1]. Clinically, this translates into a significant proportion of older individuals presenting with mild to moderate exocrine pancreatic insufficiency, often undiagnosed.
Population-based studies support this observation. The prevalence of exocrine pancreatic insufficiency increases with age, even among individuals without known gastrointestinal disease [2]. Additional research shows reduced faecal elastase levels in apparently healthy older adults, suggesting that digestive enzyme capacity can decline gradually and silently [3].
What is often perceived as “slower” or “heavier” digestion is, in reality, frequently less complete digestion.
Ageing is often associated with a systematic decline in stomach acid production. The reality is more nuanced. Data show that age alone does not necessarily lead to a significant decrease in gastric acid secretion. However, it is associated with reduced pepsin output, a key enzyme involved in protein digestion [4].
When gastric acidity does decrease, it is often not a direct consequence of ageing, but rather linked to associated factors such as gastric atrophy or chronic infections. Once again, this is not a uniform process—it depends on individual physiology.
At the same time, the gut microbiome—central to digestion—also evolves. But here again, the concept of “ageing” requires precision. Recent research shows that it is not chronological age per se that drives microbiome changes, but overall health status.
A review published in Nature Reviews Gastroenterology & Hepatology highlights that microbiome alterations are more closely associated with frailty and reduced resilience than with ageing itself [5]. In other words, two individuals of the same age can have radically different microbiome profiles.
Certain shifts remain common: reduced microbial diversity, loss of key metabolic functions, and altered metabolite production. Studies published in Cell Host & Microbe suggest that these changes can impair immune function and reduce the body’s ability to adapt to physiological stressors [6].
More recently, findings from Cell Reports have shown that the small intestinal microbiome—long overlooked—also changes with age, potentially impacting digestion upstream, well before the colon is involved [7].
Another key factor completes the picture: chronic low-grade inflammation, often referred to as “inflammaging.” This widely documented phenomenon reflects a persistent, low-level activation of the immune system over time [8].
This inflammatory state is far from neutral. It affects the intestinal barrier, alters interactions between the microbiome and the immune system, and can impair the body’s ability to tolerate certain foods. Experimental data have shown that age-associated microbiome changes can promote increased intestinal permeability and systemic inflammation [9].
In this context, digestion doesn’t just become less efficient—it becomes more reactive.
Taken individually, each of these mechanisms may seem modest. But together, they fundamentally alter how the body processes food.
A slightly reduced enzyme output, a less stable microbiome, a more permeable intestinal barrier, and a higher inflammatory tone—these gradual shifts are enough to change digestive tolerance.
This is why foods that were once well tolerated can suddenly become problematic. Not because the foods have changed, but because the system responsible for processing them has.
It is precisely within this context that an integrative approach becomes relevant. When digestion becomes less efficient, the goal is not simply to “relieve” symptoms, but to restore the underlying functions: enzymatic activity, microbiome balance, intestinal barrier integrity, and inflammatory regulation.
This is the logic behind N°4 FLORA.
FLORA is the Cellular Nutrition® protocol developed by Dr. Espinasse to restore microbiome balance and strengthen the integrity of the intestinal lining—two core pillars of digestive, immune, and metabolic health.
This formulation combines multi-strain probiotics, digestive enzymes, and L-glutamine, selected for their complementary and synergistic actions. Probiotics help rebalance microbial populations, digestive enzymes improve macronutrient breakdown and reduce fermentation, while glutamine supports the regeneration of the intestinal lining.
This approach directly aligns with the mechanisms described above. By addressing dysbiosis, FLORA contributes to a more stable and functional microbiome. By supporting the intestinal barrier, it helps reduce excessive permeability and associated inflammation. By enhancing enzymatic digestion, it limits excessive fermentation responsible for bloating and discomfort.
In situations of imbalance—post-antibiotic recovery, chronic stress, food sensitivities, or gut-related skin issues—this approach becomes particularly relevant. It is not designed to mask symptoms, but to correct underlying mechanisms.
FLORA therefore fits within a functional framework: restoring an intestinal environment capable of properly digesting, absorbing, and regulating, rather than temporarily compensating for imbalances.
Saying that we “digest less well with age” is therefore reductive. The reality is more nuanced—and more actionable. Digestion changes because the functions that support it evolve.
This distinction changes everything. It shifts the perspective from a fatalistic view to a functional one. Instead of accepting an inevitable decline, the focus becomes understanding which mechanisms are involved—and how to support them.
Digestion is not a fixed system. It is dynamic, dependent on multiple biological functions. As these functions evolve, digestion evolves with them.
It’s not time that alters digestion. It’s function—gradually, subtly, but decisively.
[1] Löhr JM et al. The ageing pancreas: a systematic review of the evidence. 2018
https://pubmed.ncbi.nlm.nih.gov/29474746/
[2] Rothenbacher D et al. Prevalence and determinants of exocrine pancreatic insufficiency. 2005
https://pubmed.ncbi.nlm.nih.gov/16036530/
[3] Herzig KH et al. Faecal elastase levels in older individuals. 2011
https://pubmed.ncbi.nlm.nih.gov/21698421/
[4] Feldman M et al. Effects of aging on gastric acid and pepsin secretion. 1996
https://pubmed.ncbi.nlm.nih.gov/8612992/
[5] Ghosh TS et al. The gut microbiome as a modulator of healthy ageing. Nature Reviews Gastroenterology & Hepatology. 2022
https://www.nature.com/articles/s41575-022-00605-x
[6] DeJong EN et al. The gut microbiota and unhealthy aging. Cell Host & Microbe. 2020
https://www.cell.com/cell-host-microbe/fulltext/S1931-3128(20)30409-1
[7] Leite G et al. The small intestinal microbiome in ageing. Cell Reports. 2021
https://www.cell.com/cell-reports/fulltext/S2211-1247(21)01219-5
[8] Ferrucci L & Fabbri E. Inflammaging and chronic disease. 2018
https://pubmed.ncbi.nlm.nih.gov/30065258/
[9] Thevaranjan N et al. Age-associated microbial dysbiosis promotes intestinal permeability and inflammation. Cell Host & Microbe. 2017
https://www.cell.com/cell-host-microbe/fulltext/S1931-3128(17)30112-9