Ultra-processed foods: what they are, how they affect your health and how to cut back

What an ultra-processed food is

The most useful way to understand it is the NOVA classification, which groups foods by their degree of processing. At the far end are ultra-processed foods (group 4): products made not from food but from substances EXTRACTED from food (refined oils, sugars, starches, protein isolates) combined with cosmetic additives — colorings, flavorings, emulsifiers, stabilizers — to achieve a tasty, cheap, long-lasting product. Soft drinks, industrial pastries, packaged snacks, sugary cereals, processed meats, ready meals, commercial sauces and many "fitness" bars are typical examples. The clearest clue: a long ingredient list full of names you would never keep in your pantry.

Processed is not the same as ultra-processed

This is the most common misunderstanding. Processing a food covers everything from entirely healthy practices to deep industrial ultra-transformation. Freezing vegetables, canning cooked legumes, fermenting yogurt, pressing olive oil or baking wholegrain bread are processes that preserve or improve good foods. Demonizing "everything that comes in a packet" is a mistake that complicates your life without improving your health. What the evidence points to is not processing in general, but a diet pattern dominated by ULTRA-processed products: that is where the problem lies.

What the science says about your health

The epidemiological evidence is abundant and consistent. Large cohort studies such as Srour et al. (2019) and Rico-Campa et al. (2019), both published in the BMJ, associate higher ultra-processed intake with greater cardiovascular risk and higher mortality. The umbrella review by Lane et al. (2024), also in the BMJ, gathered dozens of meta-analyses and found relationships with obesity, type 2 diabetes, cardiovascular problems, anxiety and mortality. These are observational studies — they show association, not proof of cause on their own — but the consistency across them is hard to ignore.

The key proof: they make you eat more

Where the science moves from correlation to cause is the controlled trial by Hall et al. (2019), one of the most cited nutrition studies of the past decade. People were placed in a controlled environment and allowed to eat freely — two weeks on an ultra-processed diet and two on real food, with the same macronutrients available. Result: on the ultra-processed diet they ate about 500 kcal MORE per day and gained weight, without meaning to. The explanation is that ultra-processed foods are engineered to be hyperpalatable, eaten fast and poorly satiating for the calories they carry — the perfect storm for overshooting without noticing.

Can you eat them if you count calories?

Yes, with nuance. An occasional ultra-processed item fits any diet if it fits your calorie budget; no single food ruins a healthy pattern. But be realistic: they are far easier to overconsume than real food and deliver little satiety and few nutrients per calorie, so leaning on them makes keeping the deficit harder and neglects your long-term health. The key is the proportion: occasional treat, yes; foundation of your diet, no.

How to cut back without obsessing

This is not about chasing purity, but about shifting the proportion. Apply the 80/20 rule: build the bulk of your diet on real food — vegetables, fruit, legumes, eggs, meat, fish, dairy, whole grains — and keep ultra-processed foods as the exception, not the norm. Cooking more at home, shopping with a plan and learning to eat healthy the simple way do almost all the work. And do not fall for "healthy" marketing: many products with fitness, protein or "sugar-free" labels are still ultra-processed. Reading the ingredient list is your best filter.

Cutting back on ultra-processed foods starts with seeing how many you actually eat — and that is where most of us fool ourselves. With Renzy you photograph your meals and see at a glance the real pattern of your diet, not the version you think you eat. That honest mirror, without guilt, is what makes it easy to gradually swap ultra-processed for real food, without impossible diets or bans.