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Supermarket shelves are heaving with faux meats and vegan ultra-processed foods.

And if you don’t want to put cow’s milk in your cuppa, there are loads of alternatives derived from plants.

But are these ultra-processed vegan and vegetarian offerings as healthy as they look?

James Gallagher investigates for Radio 4's Inside Health.

“Most of the food we eat is processed,” says Dr Giles Yeo, an obesity expert at Cambridge University. Cooking is a process; fermentation is a process. “Ultra-processed foods however are a modern phenomenon in which they need to be industrially made, so these are processes which we cannot replicate in our kitchen.”

For example, it might be taking a chicken carcass, forcing it through a sieve to extract every last morsel of meat and tendon, and then reforming the resulting “white slime” into a chicken nugget. “It’s this industrial process of extrusion,” Giles explains.

What’s the problem with ultra-processed foods?

The problem with these types of foods, says Giles, is that they are stripped of protein and fibre. And because they’re so ultra-processed they lack flavour, so you have to create it by adding salt, sugar and fat. “So ultra-processed foods tend to be low in protein and fibre, and high in salt sugar and fat. That’s their problem.”

This also makes them “hyper-palatable.” Of the calories we eat today, in high income countries like the UK, 50 to 60 percent come from ultra-processed food.

So, what’s the impact on our health? “In countries which have more ultra-processed foods, there is an increase in obesity and other diet related illnesses,” says Giles.

Interestingly, when we think about ultra-processed foods, we tend to think about burgers and hotdogs. “But ultra-processed vegetarian or vegan foods, faux-meat burgers, they almost have an aura, a halo of health around them,” says the obesity expert. “They’re ultra-processed foods with very good PR.”

“Ultimately, meat and fish are never going to be a processed food, because they are a single ingredient food,” explains Sophie Medlin, Dietician and Chair of the British Dietetic Association for London.

“When we get into trying to replicate them from plant products, we are definitely going to have to process them in order for them to look and feel and taste in any way palatable… The more you’re trying to make something imitate something that it’s not, the more processing it’s going to have to go through.”

Beware protein substitutes that contain little to no protein

“A lot of the higher tech faux meat burgers tend to be made with mung bean protein or peas and those will have protein,” says Giles. They may be more processed than the basic Quorn products (which are mainly made from fungus) or things like tofu, but some protein is present.

However, other ingredients used to imitate meat tell a different story. Jackfruit is sold as a vegan substitute for pulled pork, for instance. The issue here is that “jackfruit contains nearly no protein whatsoever,” states Giles. So, if you choose vegan pulled pork for your main and don’t replace the protein elsewhere, you end up having a meal with very little protein.

On most supermarket shelves you’ll now find soya milk, coconut milk, almond and oat milk – and that’s just scratching the surface. Are these faux milks ultra-processed? Should we be thinking twice about drinking them?

“Some are certainly better than others, and some have gone through more processing in order to get them there,” says Sophie. Soya milk is a side product from making tofu and it’s high in protein. Coconut milk is just squeezed out of coconuts. Almonds do contain fat and some level of protein. “It is when you start to get to the oat and the quinoa milks that we get into some real ultra-processing,” says the dietician. They’re soaked in order to extract the white colour, fat is added (normally in the form of rapeseed oil) because neither contain fat naturally, iron and minerals are added, and the entire thing is emulsified.

Always buy fortified

Professor Susan Lanham-New, Head of Nutrition Sciences at Surrey University, has been investigating how good these milks are for us. She says the most important thing, when switching to a plant-based milk, is to make sure it’s fortified with the right vitamins and minerals.

The first is calcium. “We know that cow’s milk is naturally very high in calcium and we know in the United Kingdom about 50 to 60 percent of our calcium comes from milk and milk products,” says Susan. Particularly for young people and children whose skeletons are growing, calcium is crucial.

Another is Vitamin D, which we need to absorb calcium and to ensure we don’t get deficient in the winter when there aren’t the same levels of UV light. “Cow’s milk doesn’t contain a great deal of vitamin D but some plant milk manufacturers have started to add vitamin D in there so, for some products, you’ll actually be getting more vitamin D than you would in your cow’s milk,” she says.

And finally, iodine, which is in some plant milks and not in others, but we know is found in appreciable amounts in cow’s milk. “Iodine is particularly important for pregnant and lactating mothers,” says the nutritionist.

“When you have plant-based or vegan foods, what you are having less of, undoubtedly, is saturated fats,” says Giles. These fats tend to come from animal-based products so by eating any plant-based foods, ultra-processed or not, you will be consuming less. “From that perspective, it is going to be healthier.”

But vegan ultra-processed foods are still lower in fibre and inherently higher in sugar, salt and fat – saturated and unsaturated. “So, from that perspective, ultra-processed vegan and plant-based foods are still ultra-processed foods.”