Lentils with the bite of chicken or fish, made from nothing but lentils, water and a freezer. That’s the promise of a new method from researchers at ETH Zurich, published in npj Science of Food in September 2026.
As a Swiss-born nutritional therapist who spends a lot of time encouraging clients to eat more beans and lentils, I couldn’t resist this one. Here’s what the researchers actually did, why it matters for your health, and what you can take from it today.
What did the ETH researchers actually do?
The team, led by Professor Patrick Rühs, called their method freeze structuring. In simple steps:
Soak whole legumes (lentils, chickpeas, beans, peas).
Blend them finely with water into a purée.
Heat the purée to 90°C for 30 minutes. The starch, protein and plant fibres set together into a soft gel.
Freeze it from one side only, in a mould that is insulated on every side except one.
That last step is the clever part. Because the cold comes from one direction, ice crystals grow in long parallel lines through the gel. As they grow, they push the legume material into thin aligned layers between them. When the gel thaws, the ice melts away but the layered structure stays. The result is a fibrous texture that, when you chew it, feels closer to meat or fish than to hummus.
The method worked with every type of legume they tested, covering species that make up 96% of global legume production. The texture varied by type and water content: red lentils gave a firmer result than soya beans, and the texture could range from something like silken tofu to something closer to a chewy cheese. In chickpea gels, freezing from one side made the gel roughly 1.5 to 3 times harder than simply chilling it in the fridge.
Why this matters: the whole legume stays whole
Most plant-based “meats” on supermarket shelves are built very differently. Manufacturers usually extract protein isolates from peas or soya, then texturise them with high-pressure extrusion machines and add binders, oils, flavourings and colourings to rebuild the food. The texture can be impressive, but much of the original plant is left behind along the way.
The ETH researchers give a striking example from tofu: making tofu from soya beans removes around 85% of the dietary fibre, 16% of the fat and 23% of the protein into the by-products (okara and whey).
Freeze structuring skips the separation step. The fibre, resistant starch, protein, minerals and polyphenols of the whole legume all stay in the final food. From a nutrition point of view, that’s exactly what we want, and it fits neatly with the food first approach I use with clients. It also means less food waste and much simpler equipment: a freezer instead of an industrial extruder.
Why legumes deserve more space on your plate
This research is really about one thing: making legumes more appealing. That’s worth doing, because the evidence for legumes is solid.
Cholesterol: A meta-analysis of 26 randomised controlled trials found that eating around one serving of pulses a day (about 130 g cooked) lowered LDL cholesterol by about 5%.
Body weight: A meta-analysis of 21 trials found that adding pulses to the diet led to modest weight loss, even when people weren’t trying to cut calories. Legumes are filling thanks to their mix of protein and fibre.
Heart and metabolic health: Large cohort studies link higher legume intake with a lower risk of cardiovascular disease, with weaker signals for coronary heart disease, high blood pressure and obesity. The certainty here is low, as is common in nutrition research, but the direction is consistent.
Fibre: Most people fall well short of the 25 to 30 g of fibre a day linked with lower rates of heart disease, type 2 diabetes and bowel cancer. Half a cup of cooked lentils provides around 8 g.
Legumes are also a cornerstone of the Mediterranean diet, one of the best-researched eating patterns we have. And from a planetary point of view, swapping some meat for legumes is one of the most effective changes you can make, something I touched on in my post on climate change and health.
What this study does and doesn’t tell us
It’s worth keeping this in perspective:
It’s food engineering, not a health study. The researchers measured texture and structure in the lab. They didn’t test the nutritional effects in people or run taste panels.
No recipes yet. The team says they’re leaving recipe development to chefs and plan to study next how to control the different textures more precisely.
It won’t replace meat for everyone. But a fibrous lentil “fillet” that’s minimally processed could be a much better swap than many ultra-processed meat alternatives.
Can you try freeze structuring at home?
The researchers say the method is simple enough for a home kitchen. If you like experimenting, here’s a cautious version based on their described steps:
Use red lentils or chickpeas to start. Red lentils gave a firm texture in the study and are easy to work with.
Soak, then blend with water into a thick, smooth purée.
Heat gently, stirring, until it thickens into a set gel (the study used 90°C for 30 minutes).
Pour into a small container. Wrap the sides and top with a thick towel or a piece of polystyrene, leaving only the bottom uncovered, and place it on a metal tray in the freezer. This encourages freezing from one direction.
Thaw, slice, and pan-fry or marinate like you would tofu.
A food safety note: don’t use raw red kidney beans for this. They contain a natural toxin (phytohaemagglutinin) that is only destroyed by a hard boil at 100°C for at least 10 minutes. Heating them to 80 to 90°C can actually make them more toxic. If you want to use kidney beans, boil them properly first.
Treat it as a fun kitchen experiment rather than a recipe. Results will vary.
Getting more legumes in, starting today
You don’t need a freezer trick to benefit. Some easy ways in:
Add a handful of red lentils to soups, sauces and stews. They dissolve and thicken.
Swap half the mince in a bolognese or chilli for cooked lentils.
Keep jars or tins of chickpeas and white beans for quick salads and traybakes.
Try hummus, falafel or dal as a regular lunch.
If beans make you bloated, start small (2 to 3 tablespoons a day), rinse tinned legumes well, and build up gradually. Research suggests most people’s gas symptoms settle within a few weeks as the gut adapts. If bloating is a regular problem for you, my article on why you might always be bloated goes into more detail.
The bottom line
The ETH method is a lovely example of food science getting simpler, not more complicated. It turns whole legumes into a fibrous, satisfying food without stripping out the fibre and nutrients that make them so good for us. It’s early days, but anything that makes lentils and beans more appealing gets a thumbs up from me.
If you’d like help building more plant protein into your meals in a way that suits your digestion, training or family, book a free call and we’ll work it out together.
FAQ
What is freeze structuring?
Freeze structuring is a method developed at ETH Zurich that gives whole legumes a fibrous, meat-like texture. Soaked legumes are blended, heated into a gel, then frozen from one side only. Ice crystals grow in parallel lines and push the legume material into aligned layers, which stay in place after thawing.
Are freeze-structured lentils healthier than plant-based meat?
Potentially, yes. Most plant-based meats are made from extracted protein isolates plus additives, while freeze structuring uses the whole legume, so the fibre, starch, minerals and protein stay in. However, the study tested texture, not health effects in people, so we can't yet say how it compares in practice.
Can I make meat-like lentils at home?
The researchers say the method is simple enough for a home kitchen. Red lentils or chickpeas are the easiest to start with. Avoid raw red kidney beans unless you boil them hard at 100°C for at least 10 minutes first, as lower temperatures do not destroy their natural toxin.
How many legumes should I eat for health benefits?
Around one serving a day (about 130 g cooked, or roughly half a cup) has been shown in trials to lower LDL cholesterol by about 5%. If you are not used to legumes, start with 2 to 3 tablespoons a day and build up gradually.
Why do beans and lentils cause gas, and does it get better?
Legumes contain fermentable fibres that your gut bacteria break down, producing gas. For most people this settles within a few weeks of regular eating. Starting small, rinsing tinned legumes, and choosing lentils first can help. If bloating is severe or ongoing, it is worth getting checked.
View scientific references
Bach A, Perler E, et al. Freeze structuring unlocks minimal-processing strategies for legume texturization . npj Science of Food. 2026;10:258.
Ha V, Sievenpiper JL, de Souza RJ, Jayalath VH, Mirrahimi A, Agarwal A, et al. Effect of dietary pulse intake on established therapeutic lipid targets for cardiovascular risk reduction: A systematic review and meta-analysis of randomized controlled trials . CMAJ. 2014;186(8):E252–E262.
Kim SJ, de Souza RJ, Choo VL, Ha V, Cozma AI, Chiavaroli L, et al. Effects of dietary pulse consumption on body weight: A systematic review and meta-analysis of randomized controlled trials . American Journal of Clinical Nutrition. 2016;103(5):1213–1223.
Reynolds A, Mann J, Cummings J, Winter N, Mete E, Te Morenga L. Carbohydrate quality and human health: A series of systematic reviews and meta-analyses . The Lancet. 2019;393(10170):434–445.
Viguiliouk E, Glenn AJ, Nishi SK, Chiavaroli L, Seider M, Khan T, et al. Associations between dietary pulses alone or with other legumes and cardiometabolic disease outcomes: An umbrella review and updated systematic review and meta-analysis of prospective cohort studies . Advances in Nutrition. 2019;10(Suppl 4):S308–S319.
Winham DM, Hutchins AM. Perceptions of flatulence from bean consumption among adults in 3 feeding studies . Nutrition Journal. 2011;10:128.
