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Sourdough - transform your bread & your health

The Healthiest Bread in the World: Science-Backed Baking for a Better Gut Heath

Vanessa Kimbell is a time-served baker who specialises in gut health and trained in the art of sourdough bread in the Dordogne. A bestselling author, she holds a doctorate in Baking as Lifestyle Medicine and Preventative Health and is a member of BANT. Vanessa combines deep expertise in sourdough with unparalleled knowledge of the science of bread and digestion. At The Sourdough School, she teaches personalised artisan bread tailored to optimise gut health and genetics. Discover healthy bread recipes, tips, and techniques featuring sourdough fermentation, wholegrain benefits, and personalised baking advice—designed to inspire a slower, healthier approach to baking, eating, and sharing bread.

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Baking Glossary

Whether you’re reading one of my books, or a feature, following a recipe, or you have stumbled across this page on a google search, you may encounter some unfamiliar terms, especially if you’re new to baking. I often write about health and lifestyle medicine alongside my recipes and articles. I believe that knowledge is empowerment, and I never want to oversimplify or water down the information I share.

Too often, we assume people don't want deeper insights, but I believe that understanding the ‘why’ and ‘how’ behind baking leads to better, more intentional choices. The purpose of this glossary is to ensure that everyone—regardless of their background or level of baking experience—has equal access to the knowledge they need to bake bread that is not only delicious but deeply nourishing.

It’s not just about making bread; it’s about making sure that the people you bake for are nourished, ensuring that the bread you bake possibly impacts you, and is full of nutrients and made with purpose and care. So this glossary has been created so I can share that knowledge as generously and widely as possible in the hope that you will, in turn do the same.

Please get in touch if you have any suggestions for additions.

Kind regards

Dr Vanessa Kimbell


Elasticity

A property of dough which allows it to regain its shape after being stretched. A strong dough is elastic but not very extensible. See also ‘Extensibility’.

Read moreElasticity

Emmer

Emmer is one of the oldest cereals to be cultivated by man. It is closely related to modern wheat varieties and is valued for its ability to grow well in …

Read moreEmmer

Endosperm

Makes up the largest part of a grain and provides the food source for the germinating plant. The endosperm contains carbohydrates, protein, iron and some B vitamins. White flour consists …

Read moreEndosperm

Enriched dough

A dough made with butter, sugar, eggs or oil. Enriched doughs are softer and richer than those made solely with flour, water, salt and yeast. Examples include brioche and hot …

Read moreEnriched dough

Enzymes

Enzymes are biological catalysts which mean that they speed up chemical reactions in the human body. Most enzymes are proteins, and they are essential for our bodies to function. They …

Read moreEnzymes

Epithelium

The lining of the gut is called the Epithelial and it performs a variety of functions that includes, absorption, secretion, excretion, filtration, diffusion, and sensory reception but one of its …

Read moreEpithelium

Exercise & Functional Movement

Baking as Lifestyle Medicine is underpinned by the 6 pillars of Lifestyle Medicine. There is relationship between health, what you eat and moving your body.  We build in routines in …

Read moreExercise & Functional Movement

Exopolysaccharides

Exopolysaccharides (EPS) are complex sugars (polysaccharides) which are secreted mainly by sourdough lactic acid bacteria during the long slow fermentation process. In addition to natural polysaccharides present in cereal grains …

Read moreExopolysaccharides

Extensibility

A property of dough which allows it to be stretched. See also ‘Elasticity’.

Read moreExtensibility

Extraction rate

A measure of the percentage of the grain that is made into flour during the milling process. Flour with a higher extraction rate has more of the bran, germ and …

Read moreExtraction rate

Facultative Heterofermentative lactic acid bacteria.

Sourdough starters are a symbiotic relationship between lactic acid bacteria and yeast. So you will find different find both yeast and lactic acid bacteria.  There are three categories of of …

Read moreFacultative Heterofermentative lactic acid bacteria.

Falling number test

Damp grains may germinate prior to milling, resulting in poor quality flour. The Falling number test indicates the amount of sprout damage by measuring enzyme activity in a wheat sample.

Read moreFalling number test

Farinograph

Equipment for measuring the rheological properties of dough as it is mixed. A farinograph measures development time and the stability of a dough during mixing.

Read moreFarinograph

Fermentation

Fermentation occurs when the yeast and bacteria in dough convert carbohydrates (simple sugars) to carbon dioxide and alcohol. A process that causes gas bubbles to form and has a leavening …

Read moreFermentation

Ferulic acid

A phenolic phytochemical found in the cell wall of plants. One of the most abundant phenolic acids in plants and an antioxidant. Ferulic acid (4-hydroxy-3-methoxycinnamic acid) is a naturally occurring …

Read moreFerulic acid

Fibre

What Is Fibre? Dietary fibre refers to plant-based carbohydrates that the human body cannot digest in the small intestine. Unlike sugars and starches, fibre passes through to the large intestine, where …

Read moreFibre

Flaxseed

Flaxseed (or linseed) are small seeds that are high in fibre and can be used to bring a range of health benefits to your baking. There is evidence that flax …

Read moreFlaxseed

FODMAP

Fermentable oligo-, di-, mono-saccharides and polyols: a group of short-chain carbohydrates (lactose, fructose, fructans, sugar alcohols, and galactans) that are indigestible to some people and may be associated with symptoms …

Read moreFODMAP

Folate

Folate is a B vitamin which is used by the body in the formation of red and white blood cells, metabolising carbohydrates to produce energy and in DNA and RNA …

Read moreFolate

Folding

A technique for aiding gluten development in a dough. The dough is tipped out onto a work surface and folded in thirds, like a letter, turned through 90o and folded …

Read moreFolding

Food Security and Bread

What is food security? When we refer to food security waht we are measuring is the ability of people gloablly to access to safe and nutritional food and accecss is …

Read moreFood Security and Bread

Free Radical

An atom or molecule with at least one unpaired electron. Free radicals are highly reactive, seeking to acquire electrons. They are known to cause cell and DNA damage in the …

Read moreFree Radical

Functional Medicine

What is Functional Medicine? Functional Medicine is a patient-centred approach to healthcare that focuses on the root causes of chronic illness. It considers how genetics, environment, diet, and lifestyle interact …

Read moreFunctional Medicine

Fungal amylase

Enzymes extracted or purified from microscopic moulds

Read moreFungal amylase

Germ

The part of a grain that, given the right conditions for germination, would sprout. The germ has a high fat content, and is usually separated out during milling because its …

Read moreGerm

Gliadin

A protein in wheat and other cereals needed for the formation of gluten. Gliadin provides extensibility in dough, allowing it to stretch. See also Glutenin.

Read moreGliadin

Gluten

Gluten is a complex protein composite found predominantly in the endosperm of wheat, barley, and rye grains. It plays a crucial role in various baking and culinary applications, contributing to …

Read moreGluten

Glutenin

A protein found in wheat and other cereals, needed for the formation of gluten. Glutenin gives dough its elasticity, causing it to spring back into shape when stretched. See also …

Read moreGlutenin

Glycaemic Index (GI)

The glycaemic index (GI) is a rating system that shows how quickly each food affects your blood sugar (glucose) level when that food is eaten on its own. The GI index …

Read moreGlycaemic Index (GI)

Glyphosate

Definition: Glyphosate is a broad-spectrum systemic herbicide and crop desiccant. It is used to kill weeds, especially annual broadleaf weeds and grasses that compete with crops. It was discovered to …

Read moreGlyphosate

Green Flour

Freshly Milled Flour, Oxidation, and Green Flour Freshly milled flour that has not had time to oxidise retains many of its natural nutrients and flavours. This is because the milling …

Read moreGreen Flour

Gut Brain Access

The gut-brain axis is a bidirectional communication pathway between the gut and the brain. This communication occurs via a complex network of neural, endocrine, and immune signalling pathways. The gut-brain …

Read moreGut Brain Access

Gut Microbiome

What is the Gut microbiome? The gut microbiome comprises of the trillions of bacterial species that inhabit our gut, mainly the large intestine. In the last decade, the gut microbiota …

Read moreGut Microbiome

Gut-Brain Axis

The Gut-Brain Axis is a signalling pathway which exists between the gastrointestinal tract and the central nervous system. The communication between these two systems is largely affected by the composition …

Read moreGut-Brain Axis

Hard Wheat

Varieties of wheat with a high protein and gluten content, making them especially suitable for bread making. Usually grown in areas with colder climates.

Read moreHard Wheat

Heterofermentative lactobacilli

You do not have to understand bacteria  in your starter to make great bread. However a rudimentary understanding of the balance of the bacteria can help you develop the flavour …

Read moreHeterofermentative lactobacilli

High extraction flour

Flour with an extraction rate between whole wheat (100%) and bread flour (70-75%).

Read moreHigh extraction flour

Homofermentative lactobacilli

Homofermentative LAB (homo meaning ‘all the same’) refers to the end product of fermentation, which is only, or ‘all’ lactic acid, they also produce carbon dioxide (CO2) as by-product . Lactic acid is the flavour …

Read moreHomofermentative lactobacilli

Hydration

Understanding Flour and Adjusting Hydration in Sourdough is key to success. Whenever I have students here they all tell me that they just want to follow the recipe right? So …

Read moreHydration

Hygroscopic

Describes a substance which absorbs water from the surrounding environment.

Read moreHygroscopic

Inflammation

Inflammation is your body’s way of responding to and defending itself against injuries, infections and even, in some cases, food that your immune system recognises as a threat. When your …

Read moreInflammation

Iron

Iron is used in making red blood cells which carry oxygen around the body. About two-thirds of the iron in our body is found in haemoglobin. You should be able …

Read moreIron

Irritable Bowel Syndrome (IBS)

What Is IBS? Irritable Bowel Syndrome (IBS) is a common, lifelong functional gastrointestinal condition. People with IBS often experience stomach cramps, bloating, constipation, or diarrhoea. Symptoms can come and go, …

Read moreIrritable Bowel Syndrome (IBS)

Ketones

Organic compounds formed when fat is metabolised in the body.

Read moreKetones

Khorasan (Kamut)

Khorasan (Triticum turgidum subsp. turanicum) is an ancient form of wheat, named after the historical region of what is now Iran. Grains of Khorasan are larger than modern wheats and it is …

Read moreKhorasan (Kamut)

Kjeldahl Method

Kjeldahl Method: The Kjeldahl method, developed by Johan Kjeldahl in 1883, is a widely used analytical technique for the determination of the total nitrogen content in organic and inorganic samples. …

Read moreKjeldahl Method

Knead

The process of working dough by pressing, folding and stretching to ensure even distribution of ingredients and to develop gluten.

Read moreKnead

Knocking back

The process of knocking excess air out of the dough after the bulk prove. This makes for a more even texture in the bread.

Read moreKnocking back

Lactic acid

An organic acid produced by lactic acid bacteria during the fermentation process.

Read moreLactic acid

Lame

A tool consisting of a handle with a straight or curved blade, used to score the top of a loaf just before it is baked.

Read moreLame

Levain

Before I even write the word levain – I refer to Leaven as both a leaven and Levain. In the same way as the Bible calls Satan by many different …

Read moreLevain

Lifestyle Medicine

What is Lifestyle Medicine? Lifestyle medicine is a clinical approach that uses lifestyle changes as a therapeutic tool to help prevent, manage, and even reverse chronic disease. It focuses on …

Read moreLifestyle Medicine

Low density lipoproteins (LDL)

Low-density lipoprotein (LDL), commonly though incorrectly referred to as “bad” cholesterol because they deliver fat molecules to cells specially within blood vessels such as arteries. The deposition of fat within arteries could …

Read moreLow density lipoproteins (LDL)

Lycopene

We all know that tomatoes play a big role in improving the flavour and colour of our food and, if we’re being honest, we probably consume them on a daily …

Read moreLycopene

Magnesium

Magnesium is a mineral that is used by the body to help maintain normal muscle and nerve function. It is also important for keeping our heart rhythm steady and regulating …

Read moreMagnesium

Maillard reaction

The Maillard reaction is a chemical reaction between an amino acid and a reducing sugar – it occurs when certain foods are heated or stored, and changes their flavour and colour. It’s …

Read moreMaillard reaction

Malt

Malt is a key ingredient in baking. It is grains that have been soaked in water, allowed to germinate, and then dried out. This process helps develop special enzymes in …

Read moreMalt

Malted barley

Produced by allowing barley grains to germinate, then dried quickly before a plant develops.

Read moreMalted barley

Manganese

Manganese is only needed in small amounts, but has a role in many bodily functions. These include the formation of healthy bones, blood clotting, reducing inflammation and producing antioxidants. It …

Read moreManganese

Melatonin

A hormone which helps regulate your sleep cycle. Its production is influenced by your body’s internal clock and by exposure to light. Generally, melatonin levels will rise through the evening, …

Read moreMelatonin
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Todays live for diploma students will be on 'How t Todays live for diploma students will be on 'How to engage your patient in the lifestyle changes of the BALM' with @vanessakimbell 

In their 6pm live session, we help keep our students on track with the syllabus and discuss the application of Baking As Lifestyle Medicine to the 6 pillars of Lifestyle medicine, applying the research papers, application of the Research, and how this ties into prescribing, along with guest lecturers, discussions and sharing knowledge.

#lifestylemedicine #health #functionalmedicine #nutrition #integrativemedicine #healthylifestyle #wellness #lifestyle #rcgp #dietitian #nutritionist #healthcareprofessional #holistichealth #healthyliving #plantbased #guthealth #naturopathicmedicine #selfcare #functionalnutrition  #naturopathicdoctor #foodasmedicine #foodismedicine #lifestylegoals #cpd #lifestylechange #mentalhealth #sourdough #sourdoughschool #bakeforhealth
BAKE, ANALYSE, EAT; RECALIBRATE & REPEAT. 📆 Th BAKE, ANALYSE, EAT; RECALIBRATE & REPEAT.

📆 The Sourdough School Clinic - Thursdays 8pm - for students of The Sourdough School 

✏️ In this weekly live session, we cover technical baking questions. Students can submit their Baking Record Sheets in advance of the session.

📋 We look at the details of our student's bakes - the specifics of the flour, timings and temperatures. Using our sourdough record sheets Vanessa will make suggestions on how they might modify, or recalibrate the next time they bake.

Follow the link in the bio to learn more about becoming a student at The Sourdough School 👆

#sourdough #sourdoughschool #bread #sourdoughlove #sourdoughlover #naturalleavened #leavening #levain #realbread #breadmaking #bakebread #makebread #makerealbread #learntobakebread #breadmakingclass #sourdoughstories #bakingforlove #bakingtherapy #sourdoughbaking
IBS AWARENESS MONTH Do you suffer from irritable IBS AWARENESS MONTH

Do you suffer from irritable bowel syndrome (IBS)? It can be tough to deal with the uncomfortable symptoms of stomach cramps, constipation, diarrhoea and bloating. But did you know that making dietary changes, such as incorporating sourdough bread into your diet, could help alleviate some of those symptoms?

Studies have shown that sourdough's long, slow fermentation process can reduce IBS symptoms. Plus, during #ibsawarenessmonth, we're exploring how adding different herbs and spices to your sourdough can further improve both the flavour and the digestion of your bread.

Let's talk about gut health, fermentation, and how sourdough can be a delicious and healthy addition to your diet. Join the conversation and share your experiences with IBS and sourdough.

#guthealth #healyourgut #healthygut #guthealing #guthealthmatters #letfoodbethymedicine #foodasmedicine #gutbrainconnection #nutrientdense #micronutrients #digestivehealth #nutritionfacts #microbiome #breadandguts #ibsawarenessmonth
THE SOURDOUGH SCHOOL – HAND CARVED WOODEN LAME THE SOURDOUGH SCHOOL – HAND CARVED WOODEN LAME

One of the biggest issues around using a plastic lame to score sourdough, of course, is that eventually the blade will become blunt and the lame could end up in landfill.  So several years ago I talked to my dear friend EJ about developing a lame with a replaceable blade. And he came up with this very beautiful hand carved wooden lame.

Very sadly EJ is no longer with us. Recently a friend of EJ’s who is also a wood turner and carver offered to make these again for us in remembrance of our dear friend.

Follow the link in the bio to our shop where you can find our full selection of wooden sourdough tools 👆

#sourdough #sourdoughschool #bread #sourdoughlove #sourdoughlover #naturalleavened #leavening #levain #realbread #breadmaking #bakebread #makebread #makerealbread #learntobakebread #breadmakingclass #sourdoughstories #bakingforlove #bakingtherapy #sourdoughbaking
The Baking As Lifestyle Medicine (BALM) Protocol The Baking As Lifestyle Medicine (BALM) Protocol

The current food system is broken at multiple levels, from the pesticides used in our soils to the emulsifiers and additives adulterating industrially-processed foods. Nowhere is this more apparent than in the bread we eat.  The figures reported by the UK Flour Millers say that bread is bought by a staggering “99.8% of British households” and that “the equivalent of nearly 11 million loaves are sold each day. Approximately 60-70% of the bread we eat is white and sandwiches are thought to account for 50% of overall bread consumption. Average bread purchases are the equivalent of 60.3 loaves per person per year.” 

Most bread sold is made by modern processing methods that strip heart-healthy whole grains of their nutrient contents, resulting in low-fibre bread with a high glycemic index. Over time, white processed bread can increase a person’s risk of insulin resistance alongside other lifestyle diseases.

We’re on a mission to revolutionise the bread making process at every level – from soil to slice. The rules governing this are laid out in our Baking As Lifestyle Medicine protocol. 

#lifestylemedicine #health #functionalmedicine #nutrition #integrativemedicine #healthylifestyle #wellness #lifestyle #rcgp #dietitian #nutritionist #healthcareprofessional #holistichealth #healthyliving #plantbased #guthealth #naturopathicmedicine #selfcare #functionalnutrition  #naturopathicdoctor #foodasmedicine #foodismedicine #lifestylegoals #cpd #lifestylechange #mentalhealth #sourdough #sourdoughschool #bakeforhealth
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