When you’re sick, your body burns more energy fighting infection while simultaneously killing your appetite, so the best foods are the ones that deliver fluids, calories, and a handful of useful nutrients without demanding much from your digestive system. That usually means soft, bland, liquid-heavy options like broth-based soups, plain rice, bananas, toast, yogurt, and warm drinks sweetened with honey. But the ideal choices shift depending on whether you’re dealing with nausea, diarrhea, a sore throat, or a head cold, and a few popular sick-day foods have more science behind them than you might expect.
Why Eating Feels So Hard When You’re Sick
Fever alone raises your resting energy expenditure by roughly seven percent for every degree Celsius of temperature increase, and a full-blown acute infection can push that number even higher.1Pediatric Research. Effect of Malaria and Fever on Energy Metabolism in Gambian Children Your body is burning through fuel faster than usual at the exact moment it’s telling you not to eat. That mismatch puts you into a negative energy balance, meaning you’re using more calories than you’re taking in.2PubMed. The metabolic cost of fever Eating something, even a small amount, helps close that gap.
Infections can also slow your stomach’s ability to move food along. Viral illnesses have been linked to delayed gastric emptying, where food sits in the stomach longer than it should, contributing to that bloated, queasy feeling many people get even after eating something mild.3PubMed. Gastroparesis after a presumed viral illness: clinical and laboratory features and natural history This is why small, frequent meals tend to sit better than three regular-sized ones when you’re unwell. If your stomach is working in slow motion, giving it less to process at a time makes the whole experience more tolerable.
Broth, Soup, and Hot Drinks
There’s a reason chicken soup is the universal sick-day food across dozens of cultures. Sipping hot broth or soup does at least three useful things at once. First, it rehydrates you. Fever, sweating, and mouth breathing all pull water out of your body, and broth replaces both fluid and electrolytes like sodium and potassium. Second, hot liquids temporarily improve the speed at which mucus moves through your nasal passages. One study found that sipping hot chicken soup increased nasal mucus velocity from about 6.9 to 9.2 millimeters per minute, a statistically significant improvement over cold water, which actually slowed mucus movement.4PubMed. Effects of drinking hot water, cold water, and chicken soup on nasal mucus velocity and nasal airflow resistance The steam you inhale while sipping plays a role in that effect.5PubMed. Mucociliary transport
Third, chicken soup may have a mild anti-inflammatory effect. Lab testing showed that a traditional chicken soup inhibited the migration of certain white blood cells involved in inflammation, and it did so in a concentration-dependent way. Both the chicken and the vegetables contributed to this activity.6PubMed. Chicken soup inhibits neutrophil chemotaxis in vitro This doesn’t mean soup is medicine in any pharmaceutical sense, but it suggests a real mechanism behind the old advice. When commercial soups were tested, the results varied widely, so homemade versions with actual vegetables and chicken may offer more benefit than canned broth alone.
If you can’t manage solid food at all, plain broth or miso soup is a fine starting point. Warm herbal tea or even just hot water with a squeeze of lemon works too. The temperature of the liquid seems to matter more than the specific liquid when it comes to clearing congestion, though soup has the added advantage of delivering some calories and sodium.
When Nausea Is the Main Problem
Nausea narrows your options considerably. The classic advice is to stick to bland, low-fat, low-fiber foods and avoid strong smells. Dry toast, plain crackers, and simple rice are staples here because they’re unlikely to trigger a wave of queasiness the way something greasy or aromatic might. Eating them at room temperature can help, since hot food releases more odor.
Ginger is the one food with serious evidence behind it as an anti-nausea agent. The active compounds in ginger, called gingerols, have been studied extensively for their ability to reduce nausea and vomiting, particularly in the context of chemotherapy, where they’ve shown real therapeutic effect.7PubMed Central. The Antiemetic Mechanisms of Gingerols against Chemotherapy-Induced Nausea and Vomiting You don’t need a special supplement. Ginger tea made from fresh slices steeped in hot water, flat ginger ale (let it go flat first, since carbonation can worsen nausea), or even candied ginger can help. The key is using products that contain actual ginger rather than artificial ginger flavoring, which is common in commercial ginger ales.
A few practical tips for eating through nausea: sit upright for at least 30 minutes after eating, since lying down can worsen the feeling. Eat slowly. If the sight or smell of food is overwhelming, cold or room-temperature foods tend to be more tolerable than hot ones. And don’t force yourself to eat a full portion. A few bites of plain toast every hour or two is better than pushing through a full meal and losing it.
What to Eat with Diarrhea
Diarrhea creates two urgent problems: you lose fluid and you lose electrolytes. The first priority is replacing both. Oral rehydration solutions work because the combination of sodium and glucose in the right ratio helps your gut absorb water efficiently, even when the intestinal lining is inflamed.8PubMed Central. Potency of Oral Rehydration Solution in Inducing Fluid Absorption is Related to Glucose Concentration Store-bought electrolyte drinks or even a homemade mix of water, salt, and a small amount of sugar can help.
For solid food, bananas are probably the single best option. They’re easy on the stomach, they’re rich in potassium (which diarrhea depletes fast), and they contain pectin, a type of soluble fiber that has real benefits for diarrhea recovery. In a study of children with persistent diarrhea, those given cooked green banana or pectin alongside a rice-based diet saw roughly a 50 percent reduction in stool weight, and the improvement correlated strongly with measurable improvements in intestinal permeability.9PubMed. Green banana and pectin improve small intestinal permeability and reduce fluid loss in Bangladeshi children with persistent diarrhea Ripe bananas work too, though green bananas have higher pectin content.
Plain white rice, applesauce, and toast round out the familiar BRAT diet (bananas, rice, applesauce, toast). These foods are low in fiber, low in fat, and binding, meaning they tend to firm up stool rather than loosen it. There’s no strong evidence that BRAT is better than any other bland diet, but it’s easy to remember and unlikely to make things worse. As you start feeling better, add in simple proteins like boiled eggs or plain chicken rather than staying on the BRAT diet too long, since it’s nutritionally limited.
Yogurt deserves a mention here because of probiotics. Several trials have found that probiotics can reduce the duration of diarrhea, including one that showed diarrhea lasting about a day shorter in children receiving a probiotic compared to placebo.10PubMed Central. Efficacy of the Probiotic Probiotical Confirmed in Acute Gastroenteritis Probiotic-containing foods also appeared to reduce antibiotic-associated diarrhea, with roughly one-third as many cases in the probiotic group.11PubMed Central. Effects of Probiotics in Adults with Gastroenteritis: A Systematic Review and Meta-Analysis of Clinical Trials Plain yogurt with live cultures is the easiest way to get probiotics through food, and it has the bonus of being cool, soft, and relatively easy on an irritated gut. Avoid yogurts loaded with added sugar, which can worsen diarrhea by drawing water into the intestine.
Soothing a Sore Throat
When swallowing hurts, texture matters more than anything else. Smooth, soft foods are the easiest to get down: yogurt, mashed potatoes, scrambled eggs, oatmeal, smoothies, and ice pops. Many people instinctively reach for ice cream, and while there’s nothing wrong with cold foods in general, dairy’s reputation for increasing mucus production deserves a closer look.
The belief that milk makes you more congested is widespread but not well supported. A controlled trial that deliberately infected volunteers with a cold virus and then tracked their dairy intake found no association between milk consumption and nasal secretion weight or congestion symptoms.12PubMed. Relationship between milk intake and mucus production in adult volunteers challenged with rhinovirus-2 A separate hypothesis suggested that a protein fragment from certain types of cow’s milk could stimulate mucus production in the gut and possibly the airways, but this would affect only a subset of people and relates to a specific milk protein type, not dairy as a whole.13PubMed. Does milk increase mucus production? If dairy doesn’t seem to bother you when you’re sick, there’s no good reason to avoid it. If it does feel like it worsens your congestion, trust your own experience, but know that the research doesn’t back this as a universal rule.
Honey is the standout performer for sore throats. It coats the throat, which provides immediate physical relief, and it also has genuine bioactive properties. Research has found that honey can soothe sore throats, reduce cough frequency, support immune function, and shorten symptom duration.14Quality in Sport. The Efficacy and safety of honey as a treatment for pediatric cough and relation to future sport performance: a literature review A spoonful of honey stirred into warm tea or warm water with lemon is the simplest delivery method. One important caveat: honey should never be given to children under one year old due to the risk of botulism.
As for whether cold foods or warm foods are better for throat pain, the evidence is surprisingly neutral. A study comparing cold foods to room-temperature foods after tonsillectomy in children found no significant difference in pain scores between the two groups.15PubMed Central. Effect of Cold Diet and Diet at Room Temperature on Post-Tonsillectomy Pain in Children Eat whichever temperature feels better to you. Some people swear by popsicles; others find warm oatmeal more comforting. Neither is doing any harm.
When Everything Tastes Wrong
Loss of smell and altered taste became a household concern during the COVID-19 pandemic, but many respiratory infections can temporarily dull or distort your sense of taste and smell. When food tastes like cardboard or worse, eating feels pointless. Researchers studying post-viral smell loss found that the flavor changes had major impacts on appetite, enjoyment, and the desire to eat or cook. Some people reported that food tasted or smelled disgusting, and only bland items like yogurt remained tolerable.16PubMed Central. Altered smell and taste: Anosmia, parosmia and the impact of long Covid-19
If you’re in this situation, lean into texture and temperature rather than flavor. Foods with a satisfying crunch, creaminess, or cold sensation can make eating more appealing when taste is unreliable. Smoothies, cold yogurt, and foods with a bit of textural contrast (like granola on top of something soft) give your brain something to register even when your taste buds aren’t cooperating. Some people find that strongly flavored foods (spicy, sour, or very salty) break through the sensory block more than mild ones. Citrus, pickles, and hot sauce are worth trying if your stomach can handle them.
Nutritional shakes and meal-replacement drinks can be useful here as a backup. When nothing appeals to you and eating feels like a chore, a simple protein shake at least delivers calories and prevents the muscle breakdown that happens when your body has no incoming fuel to burn. This phase is temporary for most viral illnesses, but if taste and smell distortion persists beyond a couple of weeks, it’s worth mentioning to a doctor.
Nutrients That May Help You Recover Faster
Food choices during illness aren’t just about comfort. A few specific nutrients have been studied for their ability to shorten how long a cold lasts, and the evidence for two of them is worth knowing about.
Zinc lozenges, when started within 24 hours of symptom onset, appear to reduce cold duration by about a third. A meta-analysis of seven trials found an overall reduction of 33 percent, with zinc acetate lozenges showing around a 40 percent reduction and zinc gluconate around 28 percent.17PubMed Central. Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage A separate systematic review estimated the reduction at about two and a quarter days.18PubMed Central. Zinc Supplementation Reduces Common Cold Duration among Healthy Adults: A Systematic Review of Randomized Controlled Trials with Micronutrients Supplementation The key is the dosage: trials showing benefit used daily doses above 75 milligrams of elemental zinc, delivered as lozenges dissolved in the mouth, not as pills swallowed whole.19PubMed Central. Zinc Lozenges May Shorten the Duration of Colds: A Systematic Review You won’t get this dose from food alone during a cold, so this one does require a supplement if you want the effect. Zinc lozenges can leave a metallic taste and occasionally cause mild nausea, so they’re not for everyone.
Vitamin C is the classic cold remedy, and the evidence is modest but real. Regular vitamin C supplementation doesn’t prevent colds in most people, but once you’re sick, it does appear to shorten them somewhat. A Cochrane review of over 9,700 cold episodes found that adults taking vitamin C regularly had colds that were about 8 percent shorter, while children saw a 14 percent reduction.20Cochrane Database of Systematic Reviews. Vitamin C for preventing and treating the common cold A separate meta-analysis found that the benefit was concentrated on severe symptoms rather than mild ones, meaning vitamin C may be more helpful for the worst days of a cold than for the tail end.21PubMed Central. Vitamin C reduces the severity of common colds: a meta-analysis Citrus fruits, kiwis, strawberries, bell peppers, and broccoli are all rich in vitamin C if you can eat them. If not, a glass of orange juice delivers a solid dose along with fluid and sugar.
Foods That Are Harder to Digest When Sick
Knowing what to avoid is almost as useful as knowing what to eat. A few categories of food are consistently harder on your body during illness:
- High-fat foods: Fried or greasy meals slow gastric emptying further and can worsen nausea. Your pancreas and gallbladder have to work harder to process fat, which is the last thing an already-sluggish digestive system needs.
- High-fiber foods: Raw vegetables, whole grains, and legumes are great when you’re healthy but can cause gas, bloating, and cramping when your gut is inflamed. Save the kale salads for recovery.
- Spicy food: If you have a head cold and no stomach symptoms, spicy food can actually help clear congestion. But if nausea, acid reflux, or diarrhea is part of the picture, capsaicin will irritate an already-unhappy digestive tract.
- Alcohol: It dehydrates you, suppresses immune function, and interacts poorly with most cold and flu medications. There’s no upside during illness.
- Sugary drinks and candy: A moderate amount of sugar helps with fluid absorption, as in oral rehydration solutions, but large amounts of sugar can draw water into the intestine and worsen diarrhea. Sports drinks with high sugar content are a common offender here.
Coffee is a gray area. Caffeine can worsen dehydration if you’re already behind on fluids, and it can aggravate acid reflux, which many people experience during illness. On the other hand, if you normally drink coffee every day, skipping it while sick can trigger withdrawal headaches on top of everything else. A single small cup, especially if you drink water alongside it, is reasonable for regular coffee drinkers. Just don’t count it as your hydration for the day.
Feeding Kids Who Are Sick
Children get dehydrated faster than adults because of their smaller body size, so fluid replacement is even more critical. For young children with diarrhea, a study using locally available semi-solid foods like mashed banana, a rice-lentil mixture, and yogurt alongside standard rehydration therapy showed meaningful weight recovery and correction of electrolyte imbalances within a short treatment period.22Link Medical Journal. Effect of Dietary Intervention on Short-Term Weight Recovery and Electrolyte Correction in Hospitalized Children with Acute Diarrhea The takeaway is that bland, familiar, potassium-rich foods combined with proper rehydration can make a real difference in how quickly a child bounces back.
Children with fever burn through energy even faster proportionally than adults, and their metabolic response to fever correlates with their baseline nutritional status: a well-nourished child may handle the metabolic cost of fever more easily than one who was already underweight.1Pediatric Research. Effect of Malaria and Fever on Energy Metabolism in Gambian Children This is one more reason not to withhold food during illness. The old idea of “starving a fever” has no medical support. Offer small amounts frequently and follow the child’s cues. Popsicles, diluted juice, broth, and applesauce tend to be accepted when almost nothing else is. And again, no honey for babies under twelve months.