The best foods when you’re sick depend on what kind of sick you are. A cold or flu calls for warm liquids, easy-to-digest proteins, and foods rich in vitamin C and zinc. A stomach bug requires a different approach focused on hydration and gentle reintroduction of your normal diet. In both cases, staying hydrated matters more than any single food.
Fluids Come First
Whatever illness you’re dealing with, fluids are the priority. They support immune function, thin mucus, and lessen congestion during respiratory infections. During a stomach bug with vomiting or diarrhea, fluid replacement becomes even more critical because you’re losing water and electrolytes fast.
Water is the obvious starting point, but it doesn’t replace the sodium and potassium you lose through sweat, vomiting, or diarrhea. Oral rehydration solutions (like Pedialyte) are formulated with a specific balance of sodium, potassium, and a small amount of sugar to help your body absorb water more efficiently. Broth-based soups serve a similar purpose in a less clinical package. If you’re mostly dealing with a cold or flu, warm water with lemon, herbal teas, and 100% orange juice with no added sugar all help. Fruit popsicles made from 100% juice can work well too, especially if a sore throat makes drinking uncomfortable.
Best Foods for a Cold or Flu
Chicken soup earns its reputation. A study published in the journal Chest found that chicken soup significantly inhibited the movement of neutrophils, the white blood cells that swarm to infection sites and cause the inflammation behind stuffy noses and sore throats. The effect was concentration-dependent, meaning more soup produced a stronger response. Both the chicken and the vegetables in the soup individually showed anti-inflammatory activity. So this isn’t just warm comfort. The soup appears to gently reduce the inflammatory response that makes upper respiratory infections feel so miserable.
Beyond soup, lean proteins like chicken or turkey in a simple sandwich give your body the building blocks it needs to mount an immune response without taxing your digestion. Bananas provide quick energy and potassium. Apples offer vitamin C and antioxidants. Plain toast and crackers are easy to keep down if your appetite is low.
Garlic can help relieve head congestion and has immune-boosting properties. Ginger deserves special attention: it increases your body’s production of interferons, proteins that are a key part of how your immune system fights viral infections. Fresh ginger in hot water makes a simple tea that can ease both congestion and nausea.
Honey for Coughs
If a cough is keeping you up at night, a spoonful of honey before bed can help. A dose of about half a teaspoon (2.5 mL) has been shown to reduce cough frequency and severity. One important exception: never give honey to children under one year old. Honey can contain dormant spores that are harmless to older children and adults but can cause infant botulism in babies.
Zinc Lozenges to Shorten a Cold
Zinc lozenges, taken early, can cut the duration of a cold by roughly two days. The key is timing: starting zinc within 24 hours of your first symptoms is significantly more effective than waiting longer. Most study protocols used lozenges containing 10 to 23 mg of zinc (typically zinc gluconate or zinc acetate), dissolved in the mouth every two to three hours while awake, up to about six to eight lozenges per day. You don’t need to continue beyond when symptoms resolve.
Best Foods for a Stomach Bug
If you’re dealing with viral gastroenteritis, the old advice to stick strictly to the BRAT diet (bananas, rice, applesauce, toast) is outdated. The National Institute of Diabetes and Digestive and Kidney Diseases states that most experts do not recommend fasting or following a restricted diet during a stomach bug. Once your appetite returns, you can go back to eating your normal diet, even if diarrhea hasn’t fully resolved. For children, the same applies: give them what they usually eat as soon as they’re ready.
That said, some foods will make things worse while your gut is recovering. Avoid caffeine (coffee, tea, cola), which can worsen diarrhea. Skip high-fat foods like fried foods, pizza, and fast food, which are harder to digest. Cut back on drinks with a lot of added sugar, which can pull more water into the intestines and make diarrhea worse. Dairy is worth being cautious about: some people temporarily lose the ability to digest lactose after a stomach virus, and this intolerance can last a month or more.
Ginger for Nausea
Ginger is one of the most effective natural remedies for nausea, backed by clinical evidence across multiple settings. The most commonly studied effective dose is about 1,000 mg per day, which translates to roughly one teaspoon of freshly grated ginger, four cups of prepackaged ginger tea, two teaspoons of ginger syrup, or two small pieces of crystallized ginger. In a large trial of 576 cancer patients, doses of 500 mg and 1,000 mg were the most effective at reducing acute nausea. You can use it in capsule form, as a tea, or simply chew on candied ginger throughout the day.
Foods That Can Make Symptoms Worse
When you’re congested, dairy may genuinely increase mucus production. A randomized, double-blind study found that participants who avoided dairy experienced significant reductions in nasal mucus compared to those who continued eating it. This doesn’t mean dairy is harmful when you’re healthy, but cutting back while you’re stuffed up may help you breathe easier.
Refined sugar is another culprit. Diets high in added sugar can increase inflammation, and some evidence suggests high sugar intake worsens sinus symptoms specifically. Soda, candy, and sweetened baked goods are worth skipping until you’re feeling better.
Alcohol is a poor choice for obvious reasons, but it also falls into a category that may surprise you: high-histamine foods. Histamine is the same compound your body releases during an allergic reaction, causing sneezing, congestion, and a runny nose. Foods naturally high in histamine, including aged cheeses, processed meats like salami and sausage, fermented foods, dried fruits, and chocolate, can add to the histamine load your body is already dealing with during an infection. If you notice that certain foods seem to make your congestion spike, histamine content may be the reason.
Fermented Foods for Recovery
Once you’re past the worst of an illness, fermented foods like yogurt (if you’re tolerating dairy), kefir, miso, and kimchi can help replenish beneficial gut bacteria that may have been disrupted, especially after a stomach bug. Research on multi-strain probiotics has shown positive effects on post-infectious fatigue, the lingering tiredness that can hang on for weeks after an illness clears. You don’t need a specific supplement; regularly including fermented foods in your diet as you recover gives your gut microbiome the reinforcements it needs to bounce back.
If your stomach is still sensitive, start small. A few spoonfuls of yogurt or a small cup of miso soup is enough. These foods are more useful in the recovery phase than during active vomiting or diarrhea, when your gut isn’t ready to process them effectively.