Increasing Nourishment in Bread starts with the Grain

The Sourdough School Population Wheat & Barley

Dr Vanessa Kimbell’s Vision for the Healthiest Botanical Blend in the World

For many years, Dr Vanessa Kimbell – founder of The Sourdough School, fourth-generation baker, and holder of the world’s first doctorate in Baking as Lifestyle Medicine and Preventative Health – has been quietly researching what makes bread genuinely nourishing. To understand the depth of knowledge that sits behind this photograph, you have to go back many years and follow a project of patient learning, of trial and error, of slowly working out what makes a grain truly nourishing and what does not. That long apprenticeship is what has allowed her to select and blend grains into what she believes is the healthiest botanical blend in the world. Her work centres on nourishment, fibre diversity, and the powerful phytochemicals that support human health and a thriving gut microbiome. Her doctoral research, now integrated into NHS clinical practice at the Bethlem Royal Hospital, demonstrates how nourishment begins long before the loaf – it begins in the soil, in the seed, and in the choice of what we plant.

When we stop thinking about our grain merely as calories and begin valuing it in terms of deep nourishment, the very first question – before we even ask how it is grown – must be what are we growing? In the overfed yet undernourished Western world, we are starved of fibre, diversity, and colour in our daily bread. Most modern wheat is beige, highly processed, and stripped of the very compounds that could transform our health. Vanessa has spent decades changing this reality, field by field and slice by slice.

How this story began: the missing colour in our bread

The story behind this photograph begins around 2014 to 2015, when Vanessa was deep in her early dietary intervention work and started analysing the biochemistry of what she was actually feeding her students. She kept noticing the same thing: bread was beige. The flour was beige. Even the so-called wholegrain loaves had been stripped of the deep colour that, in fruit and vegetables, we instinctively associate with health. She understood early – well before it became fashionable – that polyphenols and flavonoids were a major factor in nourishment, and that the same pigments giving blueberries and blackcurrants their dark colour were doing the same protective work in grain. Industrial monoculture had bred this colour out of our wheat. She wanted to put it back in.

When the American Gut Project results were published in 2016, they confirmed what she had been working towards. The single biggest predictor of a healthy gut microbiome turned out to be the diversity of plants in the diet – the people eating thirty or more different plant types a week had dramatically more diverse microbiomes than those eating ten or fewer. For Vanessa, this was the scientific validation of something she had already been teaching: that diversity, fibre and these dark phytochemical-rich grains needed to come back into our daily bread, because bread is one of the largest single sources of plant matter in most people’s diets. She included black barley as one of her signature grains in The Sourdough School book. At that time it was almost impossible to source in the UK – a premium ingredient she was having to ship in just to make a porridge with – and she wanted bakers everywhere to be able to access this kind of nourishment. That need is what led her to approach Josiah Meldrum at Hodmedod’s. That conversation became the beginning of the story that has produced what she believes is the healthiest range of flour in the world – the Botanical Blend No. 2 Meadow Blend and the Diversity Blend No. 0+, both grown by British farmers, milled in the UK, and built on the principles you are seeing in this photograph.

The breeding work: a long-standing collaboration with NIAB

Through a long-standing collaboration with wheat breeder Dr Phil Howell and the pre-breeding programme at NIAB in Cambridge, Vanessa has worked with her students to incorporate extraordinary genetic diversity into the populations grown here. Students and supporters from around the world have gifted her rare grains – from the USA, India, Iran, Saudi Arabia and beyond – which Phil has then carefully crossed with the best UK bread-making varieties to create resilient, nutrient-dense populations rich in beneficial phytochemicals. Some of these crosses now sit within NIAB’s section of the BBSRC-funded Designing Future Wheat programme. Without Phil’s quiet expertise and generosity, the populations you see in this photograph simply would not exist – he is the scientific backbone behind years of patient genetic work.

Mixed Barley Population: Gifted by Dr Ed Dickin

Black High-Anthocyanin Wheat

Why this knowledge cannot be shortcut

What that photograph captures is the part most people never see. The depth of knowledge behind this work has been built by hand, in fields and on sorting tables, over more than a decade. Reading scientific papers is the easy part. The harder, slower, more valuable knowledge is in learning how a particular variety actually grows in a wet Northamptonshire summer; in understanding which strong-strawed plants will hold up the weaker neighbours; in spotting and removing ergot one grain at a time; in knowing the agro-economics of why a farmer can or cannot afford to grow a particular population. This is what makes Vanessa’s work different. She has built the knowledge by doing it, and then applied it back into the flour, the bread, and the protocol. When you eat one of her loaves, you are quite literally eating that research.

This matters now more than ever. AI can summarise a paper in seconds, but it cannot stand in a field at harvest, sort a sack of mixed barley by colour, or know in its hands when a population is ready to scale. That kind of understanding only comes from the years of work behind the photograph above – the years that have made everything that follows possible.

Vanessa’s patient, research-driven work is creating a new future for bread: one where every loaf is a rainbow of nourishment, supporting human health and the resilience of the land in equal measure. It is a living, evolving botanical blend built over many years for maximum health benefit, and it sits at the heart of The Proven Bread Programme – the everyday application of the BALM Protocol. To explore the science underpinning this work, browse our research archive, read about why we are rethinking flour, or discover why we recommend milling your own at home.