When you’re sick, the best foods are ones that keep you hydrated, reduce inflammation, and give your body the protein and nutrients it needs to fight infection. Broth-based soups, honey, yogurt, fruits, and simple whole foods all earn their place on the list for specific, evidence-backed reasons.
What you eat during an illness matters more than most people realize. Your immune system ramps up energy use, your body loses fluids faster, and your muscles start breaking down protein for fuel if you’re not eating enough. The right foods address all three problems at once.
Chicken Soup Really Does Help
Chicken soup isn’t just comfort food. A well-known study published in the journal CHEST found that chicken soup significantly inhibited the movement of white blood cells called neutrophils in a concentration-dependent manner. Neutrophils are the immune cells that rush to the site of an infection and trigger the inflammation responsible for congestion, sore throat, and that general “sick” feeling. By mildly slowing that inflammatory response, chicken soup can ease upper respiratory symptoms without suppressing the immune system’s ability to fight the virus itself.
The anti-inflammatory activity was found in the liquid portion of the soup, not the solid chunks, which means even sipping the broth alone provides benefit. That said, a soup with vegetables and chicken gives you more: fluid to prevent dehydration, salt to replace lost electrolytes, and protein to support immune cell production. If you only eat one thing while you’re sick, make it this.
Honey for Coughs and Sore Throats
Honey is one of the most effective natural cough suppressants available, especially at night. In a clinical trial of 105 children, a single nighttime dose of honey outperformed dextromethorphan (the active ingredient in most over-the-counter cough syrups), which in turn outperformed no treatment. A separate trial of 139 children confirmed honey was also superior to diphenhydramine, another common cough medicine. A third study using three consecutive nights of honey mixed in warm milk showed similar results.
A spoonful of honey before bed coats the throat, reduces irritation, and suppresses the cough reflex. Stir it into warm water or tea for a soothing drink. One important note: honey should never be given to children under 12 months old due to the risk of botulism.
Staying Hydrated Goes Beyond Water
Fever, sweating, vomiting, and diarrhea all drain your body of water and electrolytes. Plain water helps, but it doesn’t replace the sodium and potassium you’re losing. The World Health Organization’s oral rehydration formula uses a 1:1 ratio of sodium to glucose, which takes advantage of a specific transport system in your gut that pulls water into your bloodstream more efficiently when both are present together.
You don’t need to mix your own solution. Commercial rehydration drinks from the pharmacy work well, even though they use a different sodium-to-glucose ratio (roughly 1:3). Coconut water, diluted fruit juice with a pinch of salt, and broth-based soups also deliver fluid along with electrolytes. Popsicles made from fruit juice are another option if drinking feels difficult, especially for kids.
Protein Prevents Muscle Loss
Most people think of rest and fluids when they’re sick, but protein intake is just as important. Your immune system relies on amino acids to build antibodies and other defense molecules. When you’re not eating enough protein, your body pulls it from your muscles instead, which is why prolonged illness often leaves people feeling weak even after the infection clears.
The standard protein recommendation for healthy adults is about 0.8 grams per kilogram of body weight per day. During serious illness, that need can nearly double. European nutrition guidelines for critically ill patients recommend 1.3 grams per kilogram, and some experts suggest up to 1.5 to 2.0 grams per kilogram per day during recovery. Specific amino acids like glutamine help preserve lung and intestinal function, while arginine and glycine may limit inflammatory damage.
You don’t need to calculate exact grams. Just make sure you’re getting some protein at every meal, even small ones. Scrambled eggs, skinless chicken, fish, yogurt, and smooth nut butters are all easy to eat when your appetite is low.
Probiotic-Rich Foods for Immune Support
Your gut houses a large portion of your immune system, and feeding it beneficial bacteria during illness can make a measurable difference. A randomized trial in children with respiratory infections found that those given a daily probiotic mixture (containing strains of Bifidobacterium and Lactobacillus) had a median fever duration of 3 days compared to 5 days in the placebo group. That’s a 40% faster recovery from fever.
Yogurt with live active cultures is the easiest food source of these beneficial bacteria. Kefir, which is a fermented milk drink, tends to contain even more diverse strains. If dairy bothers your stomach, fermented foods like miso (dissolved into warm broth) or kimchi can work too, though the bacterial content varies. Choose plain, unsweetened yogurt when possible, since added sugar may work against you.
What to Eat With an Upset Stomach
The classic BRAT diet (bananas, rice, applesauce, toast) has been a go-to for decades, but nutritional guidance has evolved. According to Harvard Health, restricting yourself to only those four foods for more than a day or two isn’t necessary and can leave you short on the nutrients your body needs to recover. A broader selection of bland, easy-to-digest foods is now the preferred approach.
Good options during the first day or two of nausea, vomiting, or diarrhea include:
- Brothy soups for hydration and electrolytes
- Oatmeal for gentle, soluble fiber
- Boiled or baked potatoes without heavy toppings
- Crackers and unsweetened dry cereal for easy snacking
- Bananas for potassium and binding
Once your stomach settles, expand to cooked squash, carrots, sweet potatoes without skin, avocado, eggs, and lean poultry. These foods are still gentle on digestion but provide the protein and micronutrients that pure starch does not.
Spicy Foods for Congestion
If your nose is completely blocked and you can handle a little heat, spicy foods offer temporary relief. Capsaicin, the compound that makes hot peppers burn, stimulates mucus membranes and can thin out congestion. Small clinical studies suggest capsaicin eases nasal stuffiness, though it can also cause burning, sneezing, and coughing as side effects.
A bowl of spicy broth, hot sauce stirred into soup, or a curry with chili peppers can get your nose running and help clear your sinuses for a short time. Skip this approach if you have a sensitive stomach or are dealing with nausea, since spicy foods can make gastrointestinal symptoms worse.
Foods Worth Avoiding
Sugary foods and drinks deserve caution when you’re sick. Research from Weill Cornell Medicine shows that excess blood sugar disrupts the function of key immune cells called dendritic cells, which are responsible for marshaling the body’s defense against infections. While this research focused on chronic high blood sugar in diabetes, the underlying mechanism (sugar molecules chemically modifying immune proteins) suggests that flooding your system with refined sugar during an active infection isn’t doing your immune system any favors.
Sugary sodas, candy, pastries, and sweetened juices are the main culprits. Alcohol is another clear skip, since it dehydrates you and impairs immune function. Greasy or heavily fried foods are harder to digest and can worsen nausea. Dairy is fine for most people (yogurt is actively helpful), but if it seems to thicken mucus or upset your stomach, ease off until you’re feeling better.
Putting It Together
You don’t need a complicated meal plan. A practical day of eating while sick might look like yogurt with honey in the morning, chicken soup at lunch, scrambled eggs and toast for dinner, and bananas or crackers for snacks, with rehydration drinks or warm broth between meals. The priorities are simple: fluids with electrolytes, enough protein to support your immune system, and foods gentle enough that you’ll actually eat them. Even small, frequent meals are far better than eating nothing at all.