The choice between a mass-produced supermarket loaf and an artisan bakery bread has become a common indicator of healthy eating habits for some consumers. While artisan loaves, particularly wholemeal varieties, are often perceived as the healthier option, a closer look at their nutritional profiles and production methods reveals a more nuanced picture.
Understanding Wholemeal Bread
In the UK, 'wholemeal' has a defined legal standard: the flour must include all parts of the grain—the bran, germ, and endosperm. This ensures the presence of fibre and essential nutrients. However, labels like 'wholegrain' or 'multigrain' do not carry the same strict definition and may contain significant amounts of white flour, thus lacking the fibre and vitamins found in true wholemeal bread.
Most industrially produced bread, including many supermarket loaves, is made using the Chorleywood process. Developed in 1961, this method uses high-speed mixers and Vitamin C to rapidly develop dough, shortening the traditional multi-hour fermentation to mere minutes. This process allows for the mass production of soft, sliced bread at low prices. To maintain texture and shelf life, manufacturers often add emulsifiers like calcium propionate, DATEM, and diglycerides of fatty acids, which help slow mould growth and prevent crumbling.
Artisan loaves from high street bakeries often do not display an ingredients list, leaving consumers unaware of the grain type, calorie, fibre, and salt content. While these fresh loaves may be free from the additives found in mass-produced bread, their nutritional composition can vary significantly.
Health Benefits of Wholemeal Bread
Wholemeal bread offers considerable health advantages over white bread. Two slices of standard supermarket wholemeal bread typically provide around 5.6 grams of fibre, compared to about 2.3 grams in white bread. This fibre is crucial for gut health, satiety, and can reduce the risk of various chronic diseases, including heart disease, stroke, type 2 diabetes, and bowel cancer, according to a 2019 review in The Lancet. Wholemeal bread also contains higher levels of micronutrients such as magnesium, zinc, and iron compared to white bread.
Under UK law, non-wholemeal wheat flour is fortified with calcium, iron, thiamin, and niacin to compensate for nutrients lost during milling, with folic acid soon to be added to this mandatory list. These fortifications are present in both budget and premium white loaves.
Supermarket vs. Artisan Loaves
While wholemeal bread is generally healthier than white bread, artisan loaves are often considered superior due to the potential health concerns associated with additives in supermarket bread. Some studies suggest that emulsifiers might negatively impact the gut lining or microbiome. Dr. Megan Rossi, a research fellow at King's College London, led a clinical trial indicating that a diet low in emulsifiers improved symptoms and reduced disease severity in patients with Crohn's disease. However, the evidence for harm in individuals without pre-existing bowel conditions is not yet definitive.
The cumulative intake of emulsifiers from various ultra-processed foods, including bread, baked goods, and snack bars, may be more relevant to overall health. Wholemeal sourdough can offer additional health benefits due to its slow fermentation process, which may make it gentler on the gut and improve mineral absorption. However, many sourdough loaves sold in high street chains are made with white flour and contain less fibre than standard wholemeal supermarket bread.
Rye bread is another healthy option, but it is often blended with white wheat flour, reducing its fibre content.
Choosing Healthier Options
For consumers seeking wholemeal bread without certain additives, several supermarket options are available. For example, Marks & Spencer's Super Soft Wholemeal, Tesco Finest Wholemeal, ASDA The Bakery Sliced Wholemeal Tin Loaf, and Sainsbury's Taste the Difference Soft Multiseed Farmhouse Wholemeal are noted for containing fewer additives like calcium propionate or DATEM.
Ultimately, the health impact of bread can also depend heavily on its toppings. A balanced consumption of protein, vegetables, and healthy fats is key to a nutritious meal, regardless of the bread type.