Most people think metabolism is mainly about calories, exercise, and willpower.

Yet modern research increasingly suggests that metabolism is also deeply influenced by the gut microbiome — the trillions of bacteria living within our digestive system.

Interestingly, this concept is not entirely new. In Traditional Chinese Medicine (TCM), the “Spleen” and digestive system have long been viewed as central regulators of energy production, nutrient transformation, and metabolic balance.

Today, modern science and TCM are beginning to converge on the same idea: a healthy gut may be one of the foundations of metabolic health.

How the Gut Influences Metabolism

The gut microbiome does far more than simply digest food. Gut bacteria help regulate:

• blood sugar control
• inflammation
• appetite and cravings
• insulin sensitivity
• fat storage
• energy production

 
When gut microbiota diversity becomes disrupted — whether due to chronic stress, ultra-processed foods, poor sleep, antibiotics, or sedentary lifestyles — metabolic dysfunction may gradually emerge.

This may manifest as:

• bloating after meals
• afternoon energy crashes
• brain fog
• difficulty losing weight
• unstable blood sugar levels

 
Research has shown that altered gut microbiota is associated with obesity, insulin resistance, pre-diabetes and diabetes. Certain gut bacteria can also influence short-chain fatty acid production, inflammatory pathways, and glucose metabolism.

The Gut–Spleen Axis in TCM

In TCM, the Spleen governs “transformation and transportation” — converting food into usable Qi and distributing nutrients throughout the body.

When Spleen function weakens, digestion and metabolic efficiency decline. Over time, this may lead to symptoms such as fatigue, heaviness, bloating, lethargy, and metabolic imbalance. Prolonged Spleen deficiency may eventually contribute to obesity, poor glycaemic control, and chronic dampness accumulation within the body.

From a modern perspective, this bears similarities to impaired gut barrier function, chronic low-grade inflammation, and poor metabolic regulation.

This highlights an important reality:
metabolism is not only about how much we eat. The gut microbiota is also a major player in how effectively the body processes, absorbs, and regulates nutrients.

Practical Ways to Support Gut Health

Improving metabolic health should involve supporting microbiome diversity and digestive resilience.

Helpful habits include:

• eating a wide variety of fibre-rich vegetables
• engaging in regular physical activity
• improving sleep quality
• reducing chronic stress
• limiting ultra-processed foods

 
In addition, several TCM herbs and foods have demonstrated potential microbiota-modulating and metabolic-supportive effects:

• Astragalus (黄芪) — promotes beneficial bacteria while modulating inflammation and metabolic regulation
• Chinese Yam (山药) — prebiotic food, may support glucose tolerance and improve gut dysbiosis
• Barley (薏米) — possesses prebiotic properties and may reduce inflammatory metabolic states
• Kudzu Root (葛根) — may improve glucose intolerance and support gut barrier repair
• Dendrobium officinale (石斛) — may increase gut microbiota richness and support glucose and lipid metabolism via short-chain fatty acids

Closing Insight

Pre-diabetes and obesity are often viewed primarily as problems of excessive calorie intake.
However, growing evidence suggests that true metabolic health is not merely a calorie equation — it is an ecosystem.

As our understanding of the microbiome continues to evolve, we are also uncovering new ways in which gut health, lifestyle habits, and TCM may work together to influence blood sugar regulation, energy balance, and long-term metabolic resilience.

References

• Human gut microbiome: hopes, threats and promises
• Role of gut microbiota in type 2 diabetes pathophysiology
• Astragalus improves intestinal barrier function and immunity by acting on intestinal microbiota to treat T2DM
• Research progress on the use of Traditional Chinese Medicines that are both food and medicine to intervene in prediabetes based on the gut microenvironment