Real food requires intention, and marketing can obscure what's really on the shelf
En los pasillos de los supermercados españoles, la promesa de lo saludable lleva a menudo una máscara. El nutricionista Luis Millares ha señalado cuatro productos habituales de Mercadona —arroz de microondas, yogures proteicos, muesli y pan integral— como ejemplos de ultraprocesados disfrazados de opciones nutritivas, recordándonos que el etiquetado y la realidad no siempre caminan de la mano. Su advertencia no es solo una crítica a una cadena de supermercados, sino una invitación a reconsiderar la confianza que depositamos en el marketing alimentario y a recuperar la mirada crítica ante lo que ponemos en el carrito.
- Millares lanza una alerta directa: productos que millones de familias españolas compran sin cuestionarlos podrían estar comprometiendo su salud hormonal, metabólica e inflamatoria.
- El arroz en envase de plástico calentado en microondas libera microplásticos que actúan como disruptores endocrinos, una amenaza silenciosa oculta bajo la comodidad de lo instantáneo.
- Yogures proteicos, muesli y pan integral —iconos del comer bien— esconden listas de ingredientes largas, azúcares añadidos, edulcorantes y harinas refinadas que contradicen su imagen saludable.
- La controversia se propaga en redes sociales, convirtiendo una crítica nutricional en un debate colectivo sobre la brecha entre el marketing alimentario y la ciencia.
- Millares no se limita a prohibir: propone arroz casero en cristal, yogur natural sin aditivos, huevos con jamón serrano y pan de masa madre como caminos concretos hacia una alimentación real.
Luis Millares, nutricionista especializado en salud digestiva y función metabólica, ha encendido el debate en redes sociales al señalar cuatro productos de Mercadona que, según él, nunca compraría. Su argumento central es que estos artículos —presentados como opciones rápidas o nutritivas— son en realidad ultraprocesados camuflados bajo un etiquetado engañoso.
El primero en su lista es el arroz de microondas. Millares advierte que calentar envases de plástico libera microplásticos que migran al alimento y actúan como disruptores endocrinos, afectando hormonas, metabolismo e incluso fertilidad. Su alternativa es tan sencilla como cocinar arroz en casa y conservarlo en recipientes de cristal. Los yogures proteicos reciben una crítica igualmente contundente: sus largas listas de ingredientes, cargadas de edulcorantes y aditivos, los alejan de cualquier definición honesta de alimento natural. Millares recomienda optar por yogur de vaca, cabra u oveja sin endulzar, y enriquecerlo con frutos secos o fruta fresca.
El muesli y la granola, tercera categoría cuestionada, provocan picos bruscos de glucosa en sangre y acumulan cantidades significativas de azúcar añadido. Como desayuno alternativo, el nutricionista propone huevos con jamón serrano: una combinación que aporta energía sostenida y saciedad real. Finalmente, el pan integral de molde —quizás el más sorprendente de los cuatro— es descrito como ultraprocesado disfrazado: a pesar del sello 'integral', contiene harinas refinadas, azúcares, aceites, aditivos y gluten en cantidades que favorecen la inflamación. La alternativa que defiende es el pan de masa madre o el pan de trigo sarraceno.
Más allá de la lista negra, lo que Millares persigue es un cambio de mirada: enseñar a las personas a leer más allá del envase y a entender que la alimentación real exige intención. En un mercado donde el marketing puede oscurecer lo que verdaderamente hay en el estante, su mensaje es una llamada a recuperar la capacidad crítica frente a lo que comemos cada día.
Luis Millares, a nutritionist who specializes in digestive health and metabolic function, has put Mercadona under scrutiny by naming four everyday products he would never buy—and his reasoning has spread across social media. The Spanish supermarket chain, long a fixture in household shopping routines, finds itself at the center of a conversation about what "healthy" actually means on a nutrition label.
Millares works from an anti-inflammatory framework and uses his social platforms to translate nutrition science into language people can understand. His recent post didn't mince words. He identified four products that many Spanish families buy without thinking twice, products that sit on Mercadona shelves marketed as quick solutions or nutritious choices. His message was blunt: these are ultra-processed foods dressed up in health-conscious packaging, and they deserve scrutiny.
The first target was microwave rice. Millares calls it "extremely dangerous." When plastic containers heat in the microwave, he explains, they release microplastics that migrate into the food. These particles act as endocrine disruptors—interfering with hormones, metabolism, inflammation, and even fertility. His alternative is straightforward: cook rice at home and store it in glass. The second item was protein yogurts. Millares doesn't soften his language here either, describing them as fundamentally flawed. The ingredient list, he points out, is absurdly long. His recommendation: buy plain yogurt from cow, goat, or sheep milk, and if you want added protein, choose an unsweetened version with natural flavoring, then add nuts or fruit yourself.
Muesli and granola were the third category he rejected. Both cause sharp spikes in blood glucose and contain significant amounts of added sugar, he argues. Instead, he suggests eggs with jamón serrano—a breakfast that delivers sustained energy and satiety. The fourth product, integral sandwich bread, drew perhaps his harshest criticism. Despite the "integral" label, he says, it's filled with poor-quality ingredients: refined flours, sugars, additives, oils, and substantial amounts of gluten that triggers inflammation. It's ultra-processed food in disguise. His counter-proposal: sourdough bread or buckwheat bread.
What drives Millares' intervention is a conviction that supermarket shopping decisions matter. The products he named are not fringe items—they're staples in Spanish kitchens, the kind of things people grab without reading labels or questioning marketing claims. His approach is to make visible what's actually in these foods and explain why it matters to the body. He's not simply listing what not to buy; he's teaching people to think differently about the relationship between packaging, labeling, and actual nutritional content. The broader message is clear: real food requires intention, and marketing can obscure what's really on the shelf.
Notable Quotes
These are ultra-processed foods dressed up in health-conscious packaging— Luis Millares, nutritionist
Plastic containers that heat in the microwave release microplastics that migrate into food and act as endocrine disruptors— Luis Millares
The Hearth Conversation Another angle on the story
Why focus on these four products specifically? There are thousands of ultra-processed items in any supermarket.
These four are the ones people think are safe choices. That's the trap. A parent grabbing microwave rice thinks they're being practical. Someone buying protein yogurt thinks they're making a health decision. The marketing works because the label says what people want to hear.
The microplastics claim—how certain is that science?
It's established enough that it matters. When plastic heats, it breaks down. Those particles don't just disappear; they enter the body and behave like foreign substances. For someone concerned about hormones or fertility, it's worth avoiding.
But sourdough and buckwheat bread cost more and take longer to find. Isn't that asking a lot of people?
Yes, it is. That's partly the point. Real food requires more effort. The system is designed to make the cheap option the convenient option. But if you understand what's actually happening in your body, the trade-off becomes clearer.
Do you think Mercadona should reformulate these products, or is it on the consumer?
Both. Consumers need to vote with their wallets, but companies also know exactly what they're doing. They're not ignorant about ingredients. They choose them because they're cheap and they extend shelf life. Change happens when enough people stop buying.
What's the one thing someone should change first if they're eating all four of these products?
Probably the bread. It's in almost every meal. Switch that, and you'll feel the difference in energy and digestion within weeks.