In a major review published in The Lancet, researchers say the world is witnessing a quiet but dramatic shift away from fresh, whole foods toward cheap, convenient, and highly processed meals.
According to the experts, this change is linked to higher risks of obesity, type 2 diabetes, depression, and several other long term conditions.
One researcher described UPFs as foods that come with a long list of ingredients you would never find in your own kitchen cupboard. These include emulsifiers, colourings, preservatives, and artificial sweeteners, common in items like fizzy drinks, packaged snacks, supermarket bread, and instant meals.
The review, based on more than 100 long term studies, suggests that UPFs may be tied to 12 major health problems, including heart disease and an increased risk of dying early.
Experts say these foods are often packed with sugar, unhealthy fats, and salt, but lack essential nutrients such as fibre and protein.
Prof Carlos Monteiro, one of the world’s leading voices on food processing, says the rise of UPFs is reshaping diets worldwide and pushing out fresh and minimally processed foods.
He warns that powerful global food companies, driven by profit, use heavy marketing and political influence to slow down efforts aimed at promoting healthier eating.
Some scientists, however, urge caution. They say the evidence shows a strong correlation, but not definite proof that UPFs directly cause these health problems.
Critics point out that some foods considered ultra processed, like wholegrain bread, low fat yoghurt, and baby formula, can still be part of a balanced diet.
Despite the uncertainty, many experts argue that waiting for perfect evidence would be a luxury we cannot afford. They are calling for stronger action, such as clearer warning labels, higher taxes on unhealthy products, and better access to affordable, nutritious foods.
In the UK, the government already advises people to eat more fruit, vegetables, and fibre, while cutting down on sugar, fat and salt.
But the debate continues, as researchers try to understand whether the real danger lies in the processing itself or simply in the unhealthy ingredients that many UPFs contain.
One thing is clear, ultra processed foods have become a daily staple for millions, and the world must decide how to respond to a growing health concern that shows no sign of slowing down.
