A bottle feels like action. A diet is invisible work.
En cada temporada respiratoria, los padres buscan el alimento o suplemento que proteja a sus hijos de los virus que circulan. Los nutricionistas responden con una verdad más sencilla y más exigente a la vez: no existe ese ingrediente mágico, pero sí existe una forma de alimentar al cuerpo para que sepa defenderse. La inmunidad infantil no se construye en la farmacia, sino en la diversidad y constancia de lo que se sirve en la mesa a lo largo del tiempo.
- Rhinovirus e influenza circulan ampliamente, y la preocupación de los padres por proteger a sus hijos impulsa una búsqueda desesperada de soluciones rápidas.
- El mercado de suplementos y 'superalimentos' capitaliza esa angustia, pero los nutricionistas advierten que ningún producto aislado actúa como escudo contra el contagio.
- La evidencia científica señala que la diversidad dietética —frutas, verduras, legumbres, pescado graso, huevos, lácteos y frutos secos— reduce las brechas nutricionales que debilitan la respuesta inmune.
- La suplementación con vitamina D, zinc o B12 solo está justificada en casos específicos evaluados por un profesional, no como rutina para niños sanos que se alimentan bien.
- El camino hacia una inmunidad robusta pasa por la constancia en la alimentación, el sueño, la actividad física y la vacunación —no por atajos que prometen más de lo que la ciencia respalda.
Cada temporada de virus respiratorios despierta en los padres el mismo impulso: encontrar el alimento o suplemento que mantenga a sus hijos a salvo. La nutricionista Isidora Selman, de Clínica MEDS, ofrece una respuesta que no es la que muchos esperan: ningún alimento individual previene la infección. Lo que sí importa es lo que el niño ha comido a lo largo del tiempo, porque la capacidad del cuerpo para responder a una infección depende de los nutrientes que construyen y activan las células inmunes.
Los alimentos que más contribuyen son los que la mayoría de los padres ya conoce: frutas y verduras coloridas por su vitamina C y polifenoles, legumbres por proteína y zinc, pescado graso por omega-3 y vitamina D, huevos y lácteos por proteína de calidad y B12, frutos secos en porciones adecuadas a la edad. Lo que marca la diferencia no es un superalimento en particular, sino la diversidad y la consistencia de la dieta en su conjunto.
Donde muchos padres se desvían es en el pasillo de suplementos. Selman advierte que los multivitamínicos no deben reemplazar la comida real, y que las necesidades de un niño de cinco años difieren mucho de las de uno de diez. La suplementación debe evaluarse caso a caso: la vitamina D tiene sentido ante exposición solar limitada o deficiencia confirmada; el zinc es relevante cuando su ausencia compromete la respuesta inmune; la B12 es prioritaria en niños con dietas vegetarianas estrictas o deficiencias persistentes. Ninguno de estos es una recomendación universal.
Cuando el niño ya está enfermo, las prioridades cambian: hidratación, energía suficiente, alimentos cálidos y lo que el estómago tolere. No hay evidencia sólida de alimentos milagrosos en esta etapa tampoco. Productos como el saúco negro tienen algunos estudios que sugieren que podrían acortar ciertos síntomas respiratorios, pero la evidencia es limitada y no los convierte en suplementos esenciales.
El cuerpo infantil sabe cómo combatir una infección. Solo necesita estar bien alimentado, bien descansado, activo y vacunado. La inmunidad no se improvisa en la farmacia; se construye, con paciencia, en cada comida.
Right now, as rhinovirus and influenza spread across the country, parents are doing what parents always do in respiratory season: searching for the formula that will keep their children safe. The instinct is understandable. The viruses are real. The worry is real. But according to nutritionists working with children, there is no single food that will prevent infection—and that's actually the point worth understanding.
Isidora Selman, a nutritionist at Clínica MEDS, explains that while no individual food acts as a shield against contagion, the body's ability to mount a strong response to infection depends heavily on what a child has been eating over time. During childhood, the body is growing rapidly and demanding nutrients at high rates. These nutrients—the ones that build and activate immune cells—come from a varied, quality diet, not from a miracle ingredient or a bottle of supplements.
The foods that matter are the ones most parents already know about, though the emphasis matters: colorful fruits and vegetables for their vitamin C, carotenoids, and polyphenols; legumes for protein, iron, and zinc; fatty fish for omega-3 and vitamin D; eggs and dairy for high-quality protein and B12; nuts and seeds in age-appropriate portions. The real work is in the diversity and consistency of the diet itself, not in hunting for a single superstar ingredient. Scientific evidence shows that this kind of varied, nutrient-dense eating reduces the risk of nutritional gaps that can weaken immune function.
Where many parents go astray is in the supplement aisle. Selman cautions against the routine use of vitamin supplements in healthy children who eat well. Multivitamins should not become a substitute for actual food, and the nutritional needs of a five-year-old differ substantially from those of a ten-year-old. Supplementation, she argues, should be evaluated case by case. Vitamin D matters for children with limited sun exposure or confirmed deficiency. Zinc plays multiple roles in immune function and its absence can compromise response. B12 becomes particularly important for children following strict vegetarian or vegan diets, or those with persistent deficiencies. But these are specific situations requiring professional assessment, not blanket recommendations.
There are signs that a child may not be getting enough nutrients: slowed growth, persistent fatigue, loss of appetite, difficulty recovering from illness, skin or mouth problems, poor physical performance, or frequent infections. These signals are not specific to any single deficiency, though, and they require a doctor's evaluation rather than a parent's guess.
When a child is already sick with a respiratory infection, the priorities shift. Hydration becomes central. Adequate energy and protein intake matter. Warm foods, fruits, vegetables, broths, and whatever the child's stomach will tolerate can support recovery and help meet nutritional needs. There is no solid evidence for miracle foods at this stage either. The body needs fuel and fluids, not folklore.
There has been growing attention in recent years to the connection between gut health and immune function. The intestinal microbiota plays a fundamental role in how a child's immune system develops. Prebiotics feed beneficial bacteria; probiotics are live microorganisms that may offer health benefits when given in appropriate amounts. But even here, the foundation is a good diet, not a supplement.
Products marketed for immune support—like those made from black elderberry—have some studies suggesting they might shorten the duration of certain respiratory symptoms, but the evidence remains limited. Selman's conclusion is direct: these cannot be considered essential supplements, and they should not replace the measures with stronger scientific backing: a balanced diet, adequate vitamin D when indicated, vaccination, physical activity, and good sleep. The body knows how to fight infection. It just needs to be properly fed.
Notable Quotes
Nutrition is one of the fundamental pillars for proper immune system function, especially during childhood when growth is rapid and nutrient demand is high.— Isidora Selman, nutritionist at Clínica MEDS
Multivitamins should not be used as a substitute for healthy eating, and nutritional requirements differ considerably between a five-year-old and a ten-year-old.— Isidora Selman, nutritionist at Clínica MEDS
The Hearth Conversation Another angle on the story
Why do parents reach for supplements when a balanced diet is what actually matters?
Because a bottle feels like action. A diet is invisible work—it's what you do every day, and there's no moment where you can point and say, "I did that." A supplement is concrete. You buy it, you give it, you feel like you've done something specific to protect your child.
But the nutritionist says supplements aren't necessary for healthy kids eating well. So what's the harm in giving them anyway?
The harm is subtle. You're spending money on something that doesn't help, yes, but you're also potentially replacing the habit of thinking about actual food. If a parent believes the multivitamin is handling immunity, they might relax their attention to what's on the plate.
What about vitamin D? That seems like a real gap for many children.
It is. Vitamin D is one of the few where supplementation makes sense—especially in winter, or for kids who don't spend much time outside. But that's a specific situation, not a general rule. The point is to evaluate each child individually, not to assume every child needs the same thing.
The article mentions gut health and microbiota. Is that where the real immunity work happens?
It's part of it. The gut does play a fundamental role in immune development. But again, you don't need a probiotic supplement to support that. You need fiber, variety, whole foods. The bacteria in a healthy gut are fed by what you eat, not by a capsule.
So when a child is actually sick, what should a parent do nutritionally?
Keep them hydrated. Make sure they're eating enough calories and protein. Warm soup, fruit, whatever they can tolerate. There's no magic food that speeds recovery. The body needs fuel to fight the infection. That's it.
What would surprise most parents about this?
Probably that the answer is so ordinary. They want to know about superfoods or secret nutrients. The answer is: eat a variety of real food, mostly plants, some fish and eggs, stay active, sleep well. It's not exciting, but it works.