When you’re sick, your body needs fluids, easily digestible calories, and nutrients that support your immune system. The best foods combine all three: chicken soup, honey, broth, bananas, eggs, yogurt, and citrus fruits top the list. What matters most depends on your symptoms, whether you’re dealing with a cold, a sore throat, nausea, or a fever.
Chicken Soup Earns Its Reputation
Chicken soup isn’t just comfort food. A study published in the journal CHEST found that chicken soup significantly slowed the movement of white blood cells called neutrophils in lab tests. That matters because neutrophils drive much of the inflammation behind stuffy noses, sore throats, and congestion. The effect was concentration-dependent, meaning more soup produced a stronger result. Both the chicken and the vegetables in the soup contributed anti-inflammatory activity on their own.
Beyond the immune effects, chicken soup delivers fluid, sodium, and protein in a form that’s easy to get down even when your appetite is gone. The warm broth loosens mucus and soothes irritated airways, and the protein from the chicken helps prevent the muscle breakdown that happens when your body fights infection. Clinical guidelines suggest that during a mild to moderate illness, you need around 0.8 to 1.2 grams of protein per kilogram of body weight each day. A couple of bowls of chicken soup with actual pieces of chicken gets you surprisingly close.
Honey for Coughs and Sore Throats
If a cough is keeping you up at night, honey is one of the most effective things you can swallow. A study of 105 children with upper respiratory infections found that a single dose of buckwheat honey before bed reduced cough severity by 47% and overall symptom scores by nearly 54%, compared to about 25% and 33% improvement with no treatment. Honey performed just as well as dextromethorphan, the active ingredient in most over-the-counter cough syrups.
You can take honey straight off the spoon, stir it into warm water with lemon, or mix it into tea. Its thick texture coats the throat and reduces irritation. One important note: honey should never be given to children under one year old due to the risk of botulism.
Fluids Matter More Than Food
Staying hydrated is the single most important nutritional priority when you’re sick. Fever increases water loss through the skin. Vomiting and diarrhea deplete both water and electrolytes. Even a basic cold leads to fluid loss through mucus production and mouth breathing.
Water is fine, but it doesn’t replace the sodium and potassium you lose when you’re sweating or dealing with stomach issues. Better options include:
- Broth or bouillon: provides sodium and is easy on the stomach
- Coconut water: naturally contains potassium and some sodium
- Diluted fruit juice: offers sugar for energy along with some electrolytes
- Oral rehydration drinks: designed specifically for replacing lost electrolytes
Sip steadily throughout the day rather than trying to drink large amounts at once, especially if nausea is a problem.
Best Foods for an Upset Stomach
The old BRAT diet (bananas, rice, applesauce, toast) has been a go-to recommendation for decades, and those foods are still fine for the first day or two of stomach flu or food poisoning. But Harvard Health notes there’s no need to limit yourself to just those four items. A broader range of bland, easy-to-digest foods will help you recover faster because they provide more of the protein and nutrients your body actually needs.
Good options when your stomach is sensitive include oatmeal, boiled potatoes, crackers, unsweetened dry cereal, and brothy soups. Once you can keep those down, you can add cooked squash, cooked carrots, sweet potatoes without the skin, avocado, skinless chicken or turkey, fish, and eggs. These foods are gentle enough for a recovering digestive system but nutritionally dense enough to fuel healing.
Vitamin C: Helpful but Not a Cure
Vitamin C won’t prevent a cold for most people, but it can shorten one. A large Cochrane review covering over 9,700 cold episodes found that regular vitamin C intake reduced cold duration by 8% in adults and 14% in children. At doses of 1 to 2 grams per day, children saw an 18% reduction. For people under extreme physical stress, like marathon runners and skiers, regular vitamin C cut the risk of catching a cold in half.
You don’t need supplements to hit useful levels. A single orange provides about 70 mg of vitamin C, a cup of strawberries around 90 mg, and a medium bell pepper over 150 mg. Kiwi, broccoli, and tomatoes are also strong sources. The key finding from the research is that vitamin C works best when you take it regularly, not just after symptoms start.
Yogurt and Fermented Foods
Your gut houses a large portion of your immune system, and feeding it well during illness can make a difference. Probiotic-rich foods like yogurt, kefir, and miso soup contain beneficial bacteria that help regulate immune function. Lactobacillus rhamnosus GG, one of the most studied probiotic strains, has been shown to reduce harmful bacteria in the gut while increasing beneficial ones, and it has demonstrated antiviral and antibacterial properties.
Research on the probiotic strain Bacillus coagulans GBI-30 found that it reduced the frequency, duration, and severity of upper respiratory infection symptoms in school-age children. While most of this research involves supplements rather than food, yogurt with live active cultures and other fermented foods deliver many of the same bacterial strains. If you’re dealing with a cold or flu, plain yogurt is also cold, smooth, and easy to swallow with a sore throat.
Foods to Avoid When You’re Sick
Some foods actively make symptoms worse. Dairy can thicken mucus for some people, making congestion feel more oppressive (though it doesn’t actually increase mucus production). Sugary drinks and candy suppress immune function temporarily and provide no useful nutrients. Fried and greasy foods are hard to digest and can worsen nausea. Alcohol dehydrates you and interferes with sleep, both of which slow recovery.
Spicy food is a mixed case. If you have a cold and want to clear your sinuses, a bit of hot sauce or ginger can help. But if your stomach is already irritated, spice will make things worse. Let your symptoms guide you.
Eating When You Have No Appetite
Loss of appetite during illness is normal. Your body redirects energy from digestion toward fighting infection. Forcing yourself to eat full meals isn’t necessary, but going days without calories leads to muscle loss and slower recovery.
The strategy is to eat small amounts of calorie-dense, easy foods throughout the day. A few spoonfuls of peanut butter, half an avocado, a scrambled egg, or a banana with honey can deliver meaningful nutrition without requiring you to sit through a full meal. Smoothies are particularly useful because you can pack fruit, yogurt, and even a handful of spinach into something you drink in a few minutes. Prioritize protein and fluids above all else, and let your appetite return naturally as you heal.