I recently enjoyed an on-line conversation with physicians and scientists about the benefits of an evolutionary biology approach to human nutrition. During the paleolithic period, fiber consumption was estimated to be 100 grams or more per day. This represents 7 times what most Americans consume and 3-4 times the present daily dietary recommendations. I previously posted a recipe for an anti-inflammatory vegetable soup cooked in broth. I have modified that recipe to a slight degree and did an AI search using Gemini to create tables of nutritional content, the resulting expected production of SCFAs (short chain fatty acids) and the resulting health benefits of this recipe. Here are the results.

You may be surprised by the many health benefits of this nutritional content. Through multiple mechanisms consuming this kind of soup will improve insulin sensitivity, glucose and cholesterol control, increase your production of GLP-1 and other incretins, improve sleep and reduce stress hormones, improve gut barrier function, gut health, and calm your brain. All that from some vegetable soup, easy to make, store, and consume every day.

Conversation with Gemini

Assume this recipe is cooked and separated into 9 equal portions, eating one portion per day. Provide a table with the following nutritional content for each of the components and total each at the bottom of the table. Include fiber, both soluble and insoluble, protein, starch, sugar, fat, micronutrients including all vitamins and minerals, polyphenol total and other important micronutrients. Provide the data for a portion as defined by 1/9 of the total recipe. Finally calculate the production of SCFAs from a portion of this recipe. 

3 quarts of organic chicken broth

fresh garlic, 1 head, crush/press/chop/or use food processor to

release important enzymes before cooking (let prepared garlic sit for 10

minutes before cooking, this allows the enzymes released to produce

important micro nutrients, cooking destroys the enzymes) I use a volume of

fresh garlic equal to the fresh ginger

one large piece (4) inches long)

of fresh ginger root, chop or slice then put into food processor

one large red onion, cut into

small pieces

one bunch of green onions, slice

1 bunch of Italian parsley, cut

and use stems, save greens for end of cooking

two large purple yams slice into

half inch chunks4 fresh large beets with greens,

slice beets, use the greens, cut stems into pieces

one head kale, chop stems into

1–2-inch pieces, cut greens into eat-size pieces

one head Swiss chard, chop stems

into 1–2-inch pieces, cut greens into eat-size pieces

1 head red cabbage, sliced

1 head of napa cabbage

3 carrots, cut each carrot into

thirds or fourths

3 stalks of celery chop into 2

inch pieces

1 whole leek, cut the greens into

2-inch pieces (scissors) and slice the white part into 1/2-inch slices

16 ounces of sliced button mushrooms

2 tablespoons turmeric

4 bay leaves, 4 tsp salt

Here is the nutritional breakdown per portion (1/9th of the total cooked recipe) separated into distinct tables.

Table 1: Fiber Profile (per portion)

Ingredient / Component	Soluble Fiber (g)	Insoluble Fiber (g)	Total Fiber (g)
Chicken Broth	0.0	0.0	0.0
Fresh Garlic	0.1	0.1	0.2
Fresh Ginger	0.1	0.1	0.2
Red Onion	0.1	0.2	0.3
Green Onions	0.0	0.1	0.1
Italian Parsley	0.1	0.1	0.2
Purple Yams	0.3	0.7	1.0
Beets + Greens	0.3	0.6	0.9
Kale	0.1	0.2	0.3
Swiss Chard	0.1	0.2	0.3
Red Cabbage	0.7	1.4	2.1
Napa Cabbage	0.4	0.7	1.1
Carrots	0.2	0.4	0.6
Celery	0.1	0.1	0.2
Leek	0.1	0.1	0.2
Button Mushrooms	0.1	0.5	0.6
Turmeric	0.1	0.2	0.3
Bay Leaves & Salt	0.0	0.1	0.1
TOTAL	2.8 g	5.7 g	8.5 g

Table 2: Macronutrients & Carbohydrates (per portion)

Ingredient / Component	Protein (g)	Starch (g)	Sugar (g)	Fat (g)
Chicken Broth	2.1	0.0	0.4	0.8
Fresh Garlic	0.3	0.0	0.1	0.0
Fresh Ginger	0.1	0.0	0.1	0.0
Red Onion	0.2	0.0	0.7	0.0
Green Onions	0.0	0.0	0.0	0.0
Italian Parsley	0.2	0.0	0.1	0.0
Purple Yams	0.5	4.8	0.2	0.0
Beets + Greens	0.8	0.0	1.8	0.1
Kale	0.3	0.0	0.2	0.1
Swiss Chard	0.4	0.0	0.2	0.0
Red Cabbage	1.4	0.0	3.8	0.2
Napa Cabbage	1.1	0.0	1.3	0.2
Carrots	0.2	0.0	0.9	0.0
Celery	0.1	0.0	0.2	0.0
Leek	0.1	0.0	0.3	0.0
Button Mushrooms	1.6	0.0	1.0	0.2
Turmeric	0.1	0.3	0.0	0.1
Bay Leaves & Salt	0.0	0.0	0.0	0.0
TOTAL	9.5 g	5.1 g	11.1 g	1.7 g

Table 3: Vitamin Content Key Highlights (per portion)

Ingredient / Component	Dominant Vitamins Provided
Chicken Broth	Niacin (B3), Vitamin B6
Fresh Garlic	Vitamin C, Vitamin B6
Fresh Ginger	Vitamin B6, Niacin (B3)
Red Onion	Vitamin C, Folate (B9)
Green Onions	Vitamin K, Vitamin A
Italian Parsley	Vitamin K, Vitamin C, Vitamin A, Folate (B9)
Purple Yams	Vitamin C, Vitamin B6
Beets + Greens	Folate (B9), Vitamin A, Vitamin C
Kale	Vitamin K, Vitamin C, Vitamin A
Swiss Chard	Vitamin K, Vitamin A, Vitamin C
Red Cabbage	Vitamin C, Vitamin K, Vitamin B6
Napa Cabbage	Vitamin C, Folate (B9), Vitamin K
Carrots	Vitamin A (Beta-carotene), Vitamin K, Vitamin B6
Celery	Vitamin K, Folate (B9)
Leek	Vitamin K, Vitamin C, Folate (B9)
Button Mushrooms	Riboflavin (B2), Niacin (B3), Pantothenic Acid (B5)
Turmeric	Traces of Vitamin C, Vitamin B6
Bay Leaves & Salt	Vitamin A, Vitamin C (trace amounts from bay leaves)
TOTAL SUMMARY	Extremely rich in Vitamins K, C, A, and B-complex (Folate, B6, Niacin, B2)

Table 4: Mineral Content Key Highlights (per portion)

Ingredient / Component	Key Minerals Provided
Chicken Broth	Sodium, Potassium, Phosphorus
Fresh Garlic	Manganese, Selenium, Calcium
Fresh Ginger	Magnesium, Potassium, Manganese
Red Onion	Potassium, Calcium
Green Onions	Calcium, Potassium
Italian Parsley	Iron, Potassium, Calcium
Purple Yams	Potassium, Manganese, Copper
Beets + Greens	Manganese, Potassium, Iron, Magnesium
Kale	Calcium, Potassium, Copper
Swiss Chard	Magnesium, Potassium, Iron
Red Cabbage	Potassium, Manganese, Calcium
Napa Cabbage	Calcium, Potassium
Carrots	Potassium, Manganese
Celery	Potassium, Sodium
Leek	Manganese, Iron
Button Mushrooms	Selenium, Copper, Potassium, Phosphorus
Turmeric	Iron, Manganese
Bay Leaves & Salt	Sodium (~900mg per portion from salt), Magnesium
TOTAL SUMMARY	High in Potassium, Manganese, Sodium, Iron, Selenium, Calcium, & Magnesium

Calculation of SCFA (Short-Chain Fatty Acid) Production

Short-chain fatty acids (primarily Acetate, Propionate, and Butyrate) are synthesized via colonic microbial fermentation of non-digestible carbohydrates (fermentable soluble fibers, insoluble structural fibers, and resistant starches).

Isabel Smith Nutrition

1. Fermentable Substrate Availability (per portion):

• Soluble Fiber: ~2.8 g (Nearly 100% fermentable)
• Insoluble Fiber: ~5.7 g (~20–30% fermentable in brassicas/root veggies) → ~ 1.4 g
• Resistant Starch (RS): If eaten fresh after cooking, RS is low (~0.3 g from yams). If the soup is cooled overnight in the fridge and reheated, retrograde starch formation (RS3) increases this yield to ~1.5 g.
• Total Fermentable Substrates: ≈2.8 g+1.4 g+0.3 g to 1.5 g=4.5 g to 5.7 g

2. Yield Assumptions: Human metabolic and gut microbiome studies establish that 1 gram of fermentable substrate yields approximately 8 to 10 mmol of total SCFAs (or roughly 0.4 to 0.5 grams of short-chain fatty acids).

3. Estimated Total SCFA Yield:

SCFA (mmol)=(4.5 to 5.7 grams)×8.5 mmol/g≈38 to 48 mmol per portion

SCFA (mass)≈2.2 to 2.8 grams of total SCFAs per portion

4. Typical SCFA Ratio Breakdown:

• Acetate (~60%): ≈23 to 29 mmol (Energy substrate for peripheral tissues)
• Propionate (~20%): ≈7.5 to 9.5 mmol (Utilized in hepatic gluconeogenesis)
• Butyrate (~20%): ≈7.5 to 9.5 mmol (Primary fuel source for colonocytes and gut barrier repair)

(Tip: Letting the cooked soup cool in the refrigerator overnight before portioning maximizes resistant starch content, maximizing the butyrate yield).

Assume the soup is cooled overnight and then reheated, what is the SCFA production?

Cooling the cooked soup overnight triggers starch retrogradation, converting digestible starches (specifically the amylose chains from the purple yams) into Type-3 Resistant Starch (RS3). Reheating the soup at normal eating temperatures retains the vast majority of this crystalline RS3 structure.

GlobalRPH+ 1

Because RS3 resists digestion in the small intestine, it travels into the large intestine where colonic bacteria ferment it into additional Short-Chain Fatty Acids (SCFAs).

GlobalRPH

1. Shift in Fermentable Substrates per Portion

• Soluble Fiber: ~2.8 g (~100% fermentable)
• Fermentable Insoluble Fiber: ~1.4 g (~25% of total insoluble fiber)
• Resistant Starch (RS3): ~1.8 to 2.4 g (up from ~0.3 g when freshly cooked, as ~35–50% of the yam starch retrogrades)
• Total Fermentable Substrates: ~6.0 to 6.6 grams per portion

2. Recalculated SCFA Production per Portion

Based on standard colonic fermentation yields (~8.5 mmol of total SCFA produced per gram of fermented substrate):

Total SCFA (mmol)=(6.0 to 6.6 g)×8.5 mmol/g≈51 to 56 mmol per portion

Total SCFA (mass)≈3.0 to 3.3 grams of total SCFAs per portion

This represents an approximate 20–35% increase in total SCFA output compared to eating the soup immediately after cooking.

3. SCFA Breakdown by Type

Resistant starch (RS3) specifically favors butyrate-producing bacteria (such as Faecalibacterium prausnitzii and Eubacterium rectale), slightly shifting the overall SCFA balance:

• Acetate (~55%): ≈28 to 31 mmol
  • Function: Enters systemic circulation; fuels muscle, heart, and brain tissue.
• Propionate (~20%): ≈10 to 11 mmol
  • Function: Travels to the liver; involved in gluconeogenesis and satiety signaling.

GlobalRPH

• Butyrate (~25%): ≈13 to 14 mmol
  • Function: Primary energy source for colonocytes (gut lining cells), reduces inflammation, and strengthens the mucosal barrier.

Blue Horizon Blood Tests

Describe the health benefits of these SCFAs, including but not limited to glucose control, cholesterol, appetite suppression, satiety, insulin sensitivity, anti-inflammatory properties, gut barrier function, colonic health, regularity, sleep and stress.

Short-chain fatty acids (SCFAs)—primarily acetate, propionate, and butyrate—act as vital signaling molecules throughout your body, linking gut microbial activity directly to systemic metabolic, immune, and neurological health.

1. Gut Barrier Function & Colonic Health

• Fuel for Colonocytes: Butyrate serves as the primary energy source for the epithelial cells lining your colon, supplying up to 70% of their total ATP requirements.
• Tight Junction Integrity: Butyrate and propionate upregulate the expression of key tight-junction proteins (claudin-1, occludin, and ZO-1). This seals the intestinal epithelial layer, preventing “leaky gut” and stopping bacterial lipopolysaccharides (LPS) from entering circulation.
• Mucus Layer Maintenance: SCFAs stimulate goblet cells to produce MUC2, reinforcing the protective gel-like mucus layer that shields gut tissue from physical and chemical damage.

2. Regularity & Digestive Motility

• Smooth Muscle Stimulation: SCFAs interact with free fatty acid receptors (FFAR2 and FFAR3) on enteric neurons to stimulate peristaltic reflexes, accelerating colonic transit time and encouraging regular bowel movements.
• Osmotic Balance: Microbial fermentation alters local pH and osmotic pressure, attracting sufficient water to the stool to prevent constipation without causing osmotic diarrhea.

3. Glucose Control & Insulin Sensitivity

• Incretin Hormone Release: Propionate and butyrate trigger L-cells in the distal intestine to secrete GLP-1 (Glucagon-Like Peptide-1) and PYY (Peptide YY). GLP-1 enhances glucose-dependent insulin secretion from the pancreas while suppressing glucagon.
• Skeletal Muscle Glucose Uptake: Acetate and butyrate activate AMPK (AMP-activated protein kinase) in skeletal muscle, increasing GLUT4 transporter translocation to muscle cell membranes, which boosts insulin-independent glucose clearance.
• Hepatic Gluconeogenesis Regulation: Propionate travels to the liver via the portal vein where it regulates hepatic glucose production, preventing excessive overnight glycogen breakdown.

4. Cholesterol & Lipid Metabolism

• Inhibition of Cholesterol Synthesis: Propionate inhibits HMG-CoA reductase, the rate-limiting enzyme in liver cholesterol production, helping lower circulating total and LDL cholesterol levels.
• Upregulation of Bile Acid Excretion: SCFAs lower colonic pH, promoting the conversion of primary bile acids into secondary bile acids, which binds dietary cholesterol and increases its excretion through stool.

5. Appetite Suppression & Satiety

• Central Brain Signaling: GLP-1 and PYY secreted in response to SCFAs cross the blood-brain barrier to target the hypothalamus, signaling satiety and reducing food intake.
• Direct Acetate Signaling: Acetate crosses the blood-brain barrier directly and accumulates in the hypothalamus, altering the expression of neuropeptides (POMC/CART) that suppress appetite and reduce cravings.

6. Anti-Inflammatory & Immune Properties

• HDAC Inhibition: Butyrate acts as a natural Histone Deacetylase (HDAC) inhibitor. By inhibiting HDACs, it upregulates anti-inflammatory gene expression and suppresses pro-inflammatory cytokines like TNF-alpha, IL-6, and IL-1β.
• T-Regulatory Cell Induction: SCFAs promote the differentiation of naive T-cells into Treg (regulatory T-cells) in the gut-associated lymphoid tissue (GALT), helping prevent autoimmune reactions, food allergies, and inflammatory bowel disease (IBD).

7. Stress, Sleep, & The Gut-Brain Axis

• Vagus Nerve Activation: SCFAs bind to receptors on the vagus nerve terminal in the gut wall, sending direct inhibitory signals to the central nervous system to dampen stress reactivity.
• HPA Axis Modulation: By preserving gut barrier integrity and preventing low-grade systemic inflammation (endotoxemia), SCFAs lower baseline cortisol levels and reduce hypothalamic-pituitary-adrenal (HPA) axis overdrive.
• Neurotransmitter Synthesis & Sleep Architecture: Butyrate and propionate encourage enterochromaffin cells to produce serotonin (the precursor to melatonin) and GABA. Higher SCFA levels promote deeper, more stable slow-wave sleep (NREM stage 3) by calming central nervous system excitability.

How does the SCFA yield and prebiotic diversity of this soup compare to taking a daily commercial prebiotic supplement?

A single daily portion of this cooked-and-cooled vegetable soup outperforms most single-ingredient commercial prebiotic supplements in both total yield and structural diversity.

Direct Comparison: Soup Portion vs. Typical Commercial Prebiotic

Attribute	Soup Portion (1/9th Recipe, Cooled & Reheated)	Standard Commercial Prebiotic (e.g., Inulin/GOS Powder)
Total Prebiotic Yield	~6.0 to 6.6 g per portion (Soluble fiber, RS3, oligosaccharides)	~3.0 to 5.0 g per serving (Standard scoop/capsule dose)
SCFA Production	~51 to 56 mmol (~3.0 to 3.3 g total SCFAs)	~25 to 45 mmol (Varies based on single-substrate fermentation rate)
Substrate Diversity	7+ Distinct Prebiotic Types	1 to 2 Substrates (Usually single isolated fiber type)
Microbiome Spread	Ferments across Upper, Mid, and Lower Colon	Ferments rapidly in Proximal (Upper) Colon only
Tolerability	High (Diverse fibers ferment slowly over time)	Moderate to Low (Single isolated fibers often cause rapid gas/bloating)

Key Advantages of Whole-Food Soup Diversity

1. Substrate Complexity Prevents Gut Monoculture

Commercial prebiotics typically rely on isolated fibers like inulin, fructooligosaccharides (FOS), or galactooligosaccharides (GOS). While effective, a single substrate selectively feeds only 1–2 specific bacterial species (such as Bifidobacteria).

The soup provides a complex mixture of distinct fibers that nourish a broader, healthier ecosystem:

• Inulin & FOS (Garlic, onions, leeks) → Bifidobacterium
• Beta-Glucans (Button mushrooms) → Lactobacillus and macrophage-activating immune cells
• Type-3 Resistant Starch / RS3 (Cooled purple yams) → Faecalibacterium prausnitzii (primary butyrate producer)
• Pectin & Mucilages (Carrots, beets) → Akkermansia muciniphila and Bacteroides
• Arabinogalactans & Cellulose (Brassicas: kale, cabbages, Swiss chard) → Roseburia and Ruminococcus

2. Full-Length Colonic Fermentation

Isolated prebiotic supplements (especially inulin) ferment very rapidly in the proximal (beginning) colon. This rapid gas production often leads to uncomfortable bloating, while leaving the distal (end) colon under-nourished.

Because the soup combines fast-fermenting soluble fibers with slow-fermenting insoluble structures and resistant starches, fermentation occurs gradually along the entire length of the large intestine. This ensures distal colonocytes receive a steady supply of butyrate, which is critical because the distal colon is where most colonic pathologies (like ulcerative colitis and colorectal cancers) typically develop.

3. Synergistic Bioactive Matrix

Commercial supplements supply isolated fiber without the supporting food matrix. The soup delivers prebiotics alongside polyphenols (curcumin, quercetin, anthocyanins) and glucosinolates.

Microbial enzymes break down these complex polyphenols into secondary active metabolites, while the polyphenols simultaneously act as “selective antimicrobials,” inhibiting pathogenic bacteria (Clostridia, E. coli) so beneficial SCFA producers can thrive.

Eat clean, live clean, sleep well, exercise wisely, rest often, enjoy the company of loved ones, spend time outdoors and live in the present.

Bob Hansen MD