Skip to main content

Plant-based   |   Dairy   |   Climate change

New milk on the block

Straining almonds, blending oats and grinding up soybeans: the shift to plant-based eating has seen all manner of foods miraculously turned into dairy-free milk.

And the latest to appear on supermarket shelves is milk made from peas.  

Far from bog standard green peas whizzed in a blender, these dairy-free milks are made using yellow split peas; a pale, dry pulse that looks a little like a lentil. Manufacturers use a mix of heat and pressure to grind the peas into a fine powder. Starch and fibre are removed leaving a concentrated protein flour known as an isolate, which can then be turned into vegan milk.

Sproud pea milk
Yellow split peas are ground into powder before protein is extracted and turned into milk.

Manufacturers claim that this pea milk not only tastes neutral and behaves just like dairy, it is also better for you than any other dairy free alternative and better for the planet too.

So, how does pea milk stack up against the competition?

To compete with the nutritional benefits of dairy milk, any alternative first needs to act as a source of protein. A glass of milk contains about 8g of protein or 18 per cent of an adult’s daily recommended protein intake.

Here pea milk does have an advantage over other dairy-free alternatives. Pea milk launched by the Mighty Pea Society into Sainsbury’s in 2019 matches the protein levels in dairy milk, with 8g per 240ml glass. That puts it ahead of almond (around 1g) and rice (1g) and on a par with soy (around 8g), according to a comparative study in the Journal of Food Science and Technology.

It has the added advantage over other dairy-free sources, too, of being a complete protein; it contains all nine amino acids required to build and repair tissue in the human body.

But pea alone can’t match up to the extra nutrients in dairy milk, warns Dr Stacey Lockyer, a nutrition scientist at the British Nutrition Foundation. Though different brands will have their own processes, provenance and recipes, at its base pea milk is water combined with pea protein (usually 2-4 per cent) and sometimes sugar to sweeten its neutral flavour. The only means of matching nutrients naturally found in dairy is by fortification. 

Sproud pea milk
Some dairy-free milks are fortified with vitamins to match the nutrients in cow's milk. 

Pea milk is much the same as any other dairy-free milk, with brands adding in vitamins and minerals manually. The Mighty Pea Society, for example, says its milk is fortified with 50 per cent more calcium than cow’s milk plus vitamin D, B12 and iodine. Swedish pea milk brand Sproud, launched in Waitrose in October, has also added vitamin B2, known as riboflavin.  

Each brand will fortify the basic recipe with different quantities of these key nutrients and so it’s crucial to check the label of any dairy-free milk, advises Lockyer. And be aware that “most do not provide all of the micronutrients found within cow’s milk such as iodine, riboflavin, pantothenic acid (vitamin B5) and phosphorus,” she says

When it comes to the environmental impact of pea milk things gets even less clear cut. On land and water use, farming yellow split peas might have some advantages. According to Maria Tegman, head of brand at Sproud, peas “take the least amount of land and the least water to grow” across dairy-free alternatives. “For example, almonds need 100 times as much water,” she says.

Tom Watkins, co-founder of The Mighty Pea Society, echoes this: “Pea milk takes substantially less water and so our carbon footprint is tiny,” he says.

But with pea such a new arrival in the dairy-free sector, those claims are hard to verify. A 2018 study by the University of Oxford compared the environmental impact of dairy, rice, soy, oat and almond milk, mapping out their emissions, land and water use.

Though dairy had the biggest impact globally, they found, across dairy-free there were big variations, too. Rice emitted the most carbon dioxide, oats used marginally more land and almond guzzled up substantially more water. At the time, pea was considered too niche to include.

Watkins says The Mighty Pea Society is looking to change that, working with those Oxford researchers to add pea into their comparisons and he’s confident of the results. “Yellow split peas are essentially one of the most sustainable ingredients on the planet,” he insists.

But others say it isn’t as easy to draw these sorts of comparisons. When David Cleveland, an environmental studies professor at the University of California Santa Barbara embarked on a study to compare the carbon footprint of plant milks in 2016 he quickly stopped, realising all the disparate products and processes in dairy-free made it impossible to draw any helpful conclusions.

“There’s a lot of variation out there – all peas aren’t made the same,” he told The Guardian. “What’s required are verified data on the impacts of the entire life cycle of the actual ingredients in their products.”

Mighty pea society pea milk food and farming
Peas use relatively little land and water but may travel further and have higher food miles.

That includes the food miles required to get peas from farm to fridge. Unlike the familiar green pea, yellow split peas are not widely grown in the UK (though there are companies looking to change that), which pushes up the food miles of any pea milk product. Watkins admits it’s a challenge.

“We try and source as locally as possible [but] unfortunately that isn’t really possible here in the UK, although we’ve asked a bunch of times. We source wherever a good quality harvest can be found, which can be from either the EU or sometimes further afield if needed.”

Tegman says Sproud process their product in Sweden but ship over the primary ingredient from farms in France. “We aim to have locally-sourced peas in the future,” she adds.

Despite this challenge, Watkins insists that pea is the next big thing in dairy-free. “I truly believe that within the next few years pea milk will see the same kind of growth that oat milk is currently experiencing,” he says. “More and more ingredients are going to come under scrutiny in the years to come as the general public want to play their part in helping fight global warming.”


    Diana J Newson

    1 Year 6 Months

    At least pea (or any other dairy-free milk) is free of the distressing maltreatment of newborn calves. Also plenty of fortification is added to the cow's feed so that it comes out in the milk (eg iodine), not really "naturally present"? On the whole I feel as if the article is trying to hold dairy up as some kind of gold standard' using it as a comparison without ever talking about the real numbers (eg the real amount of arable land used by dairy when animal feed is taken into account). This felt manipulative to me.

    1 Reply

    view replies

    1 Year 6 Months

    I completely agree Diana - well said- the editors comments did not explain why the plant milks are still being compared to cows milk as you say the gold standard
    What about the health hazards of consuming dairy - why concentrate on the few added nutrients & not state how much damage it does when consumed by humans
    plant milks do not contribute to digestive disorders & heart disease & do not involve the pain & suffering of animals
    Isn’t that the baseline standard you should be comparing them to?

    0 Reply

    Comments Editor

    1 Year 6 Months

    Hi Diana thanks for your feedback. As the debate around dairy vs non-dairy is huge, this article just focuses in on comparing the environmental impact and nutritional values of different non dairy alternatives for those interested in exploring them. As people are most familiar with dairy milk as part of our diets, it is used as a point of comparison for nutritional content.

    2 Replies

    view replies

    Diana J Newson

    1 Year 6 Months

    These are direct quotes from the article:
    "To compete with the nutritional benefits of dairy milk, "
    "But pea alone can’t match up to the extra nutrients in dairy milk"
    "The only means of matching nutrients naturally found in dairy is by fortification"
    "Some dairy-free milks are fortified with vitamins to match the nutrients in cow's milk."
    "The Mighty Pea Society, for example, says its milk is fortified with 50 per cent more calcium than cow’s milk plus vitamin D, B12 and iodine."
    "“most do not provide all of the micronutrients found within cow’s milk such as iodine, riboflavin, pantothenic acid (vitamin B5) and phosphorus,”
    "Though dairy had the biggest impact globally"
    Thanks for your reply, and thanks for writing such an interesting article but you can see why I think you're holding dairy up as a standard...Diana

    0 Reply

    C’est moi

    1 Year 6 Months

    I agree with Diana as yet again the lives of sentient beings are totally ignored and they are just seen as statistics. This puts us in very poor light as human beings, A glass of the milk that is destined for her baby but has been taken from her contains an immeasurable amount of suffering compared to a glass of pea milk. Let’s factor that into things in the future.

    0 Reply

    Wicked Leeks is out now

    With a focus on regenerative farming, a cover interview with ethical restaurateur Asma Khan and we answer your questions on price, plastic and organic farming. Plus the joy of seasonal summer eating.

    Read now

    Choose food that hasn't flown.

    Riverford organic veg boxes are delivered directly to your door. Choose your box now.

    Go to Riverford

    The net zero counter narrative

    Read our coverage of the new trend for net zero and see beyond the headlines.

    Read more

    Grow Your Own

    Our monthly gardening advice column offers timely advice for your organic patch, whether you're an expert grower or just starting out.


    Boom in organic unmatched by farming

    Sales of organic boomed during 2020 as the pandemic boosted interest in food quality but growth will be met by imports as UK farmers hold back.

    Read more

    Join the Wicked Leeks community

    Sign up for the newsletter and receive the five latest stories, once a week. Wicked Leeks magazine is published by organic veg box company Riverford.

    Spread the word

    The twin crises of climate change and biodiversity losses will be the defining stories of our future, but it is not too late to change direction. 

    Here at Wicked Leeks, our mission is to help inform and inspire positive change. Our journalism is free to all because of this, but we want to reach as many people as possible who share our desire for a better world. We know our readers are some of the biggest advocates of sustainable living, and you can help us grow this movement by sharing this article widely, with your friends and on social media. Now is the time to act.