When you’re sick, your body needs easy-to-digest foods that provide energy, fluids, and nutrients without making symptoms worse. What you should reach for depends on the type of illness you’re dealing with, but a few principles apply across the board: stay hydrated, eat what you can tolerate, and prioritize foods that actively help rather than just fill your stomach.
Fluids Come First
Whatever kind of sick you are, hydration is the single most important thing. Fever, vomiting, diarrhea, and even heavy mouth breathing from congestion all drain fluid faster than normal. A good baseline is roughly 1 milliliter of fluid per calorie you need in a day, which works out to about 8 cups for most adults. When you’re losing fluids through sweat or stomach symptoms, you need more than that.
Plain water works, but it doesn’t replace the sodium and potassium you lose through sweat, vomiting, or diarrhea. Broth-based soups, oral rehydration drinks, or even diluted sports drinks help replenish those electrolytes. Sip steadily throughout the day rather than trying to drink a large amount at once, especially if your stomach is sensitive.
Why Chicken Soup Actually Works
Chicken soup isn’t just comfort food folklore. A well-known lab study published in the journal Chest found that chicken soup significantly inhibited the movement of white blood cells called neutrophils, which are responsible for the inflammation that causes congestion, sore throat, and that general “stuffed up” misery during a cold. The effect was concentration-dependent, meaning the more soup, the stronger the anti-inflammatory response. Both the chicken and the vegetables in the soup contributed to this effect individually.
Beyond the lab findings, chicken soup delivers a practical trifecta: warm broth soothes a sore throat, the salt replaces lost electrolytes, and the chicken provides protein your immune system needs to build antibodies. Throw in soft-cooked carrots, celery, and noodles, and you have a meal that’s nutritious without being hard to digest. If you don’t have the energy to cook from scratch, store-bought versions still provide the basics.
Best Foods for a Cold or Flu
When you’re dealing with upper respiratory symptoms like congestion, coughing, sore throat, and fatigue, your body’s metabolic rate climbs roughly 5 to 13 percent for every degree Celsius your temperature rises. That means a moderate fever can push your calorie needs up significantly even while your appetite drops. You don’t need to force large meals, but try to eat calorie-dense, nutrient-rich foods in small portions throughout the day.
Good options include:
- Oatmeal: soft, warm, easy to swallow, and provides sustained energy from complex carbohydrates
- Scrambled eggs: one of the easiest ways to get protein when chewing feels like a chore
- Mashed sweet potatoes or squash: packed with vitamin A, which supports the lining of your respiratory tract
- Bananas: gentle on the stomach, rich in potassium, and require zero preparation
- Warm tea with honey: the honey coats the throat and genuinely suppresses coughs (more on that below)
If you’ve heard that dairy products make congestion worse, you can relax. According to the Mayo Clinic, drinking milk does not cause your body to produce more mucus. What happens is that milk and saliva mix to create a slightly thick coating in the mouth and throat that feels like phlegm but isn’t. Studies comparing dairy milk and soy milk in children with asthma found no difference in respiratory symptoms.
Honey for Coughs
Honey is one of the few home remedies with solid clinical evidence behind it. In a randomized study of 105 children with upper respiratory infections, buckwheat honey performed just as well as dextromethorphan (the active ingredient in most over-the-counter cough syrups) at reducing nighttime coughing and improving sleep. The honey group actually reported the greatest overall improvement of any group in the study.
A spoonful of honey in warm water or tea about 30 minutes before bed is a simple approach. One critical exception: never give honey to a child under 12 months old due to the risk of infant botulism.
What to Eat With an Upset Stomach
If your illness centers on nausea, vomiting, or diarrhea, the goal shifts from nutrition to tolerance. You’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. Harvard Health confirms it’s reasonable to follow for a day or two when you have stomach flu, food poisoning, or traveler’s diarrhea, but notes there’s no need to restrict yourself to just those four foods. Brothy soups, boiled potatoes, crackers, oatmeal, and unsweetened dry cereal are equally gentle on the stomach.
Once things settle down, start adding more nutritious options: cooked carrots, butternut squash, skinless chicken or turkey, fish, avocado, and eggs. These are bland enough to avoid triggering symptoms but contain the protein and micronutrients your body needs to recover. The key is graduating from “just keeping food down” to “actually nourishing yourself” as quickly as your stomach allows.
During stomach illness, avoid fried foods, dairy, caffeine, alcohol, spicy foods, acidic items like citrus and tomato sauce, and high-fiber foods like raw vegetables, nuts, seeds, and beans. These can all irritate the gut lining or speed up digestion in ways that make diarrhea worse.
Ginger for Nausea
Ginger has genuine anti-nausea properties. A large clinical trial of 644 patients found that ginger supplements at doses of 0.5 to 1.0 grams per day significantly reduced nausea. You don’t need supplements to get this benefit. Grating fresh ginger into hot water for tea, or sipping flat ginger ale made with real ginger, can help settle your stomach. Candied ginger pieces are another option that’s easy to keep in the house.
Eating While on Antibiotics
If your illness led to a course of antibiotics, your gut bacteria are taking collateral damage. Antibiotics don’t distinguish between harmful bacteria and the beneficial ones that keep your digestion running smoothly, which is why diarrhea is such a common side effect.
Probiotics can help. The strains with the strongest evidence for preventing antibiotic-associated diarrhea are Lactobacillus rhamnosus GG and Saccharomyces boulardii (a yeast related to brewer’s yeast). Look for products providing at least 5 billion colony-forming units per day, though lower doses still offer some protection. You can find these strains in specific yogurt brands and in supplement form at most pharmacies. Take them at least two hours apart from your antibiotic dose so the medication doesn’t immediately kill off the probiotics.
Fermented foods like plain yogurt, kefir, sauerkraut, and kimchi also introduce beneficial bacteria, though in less standardized amounts than supplements. Continue eating probiotic-rich foods for at least a week after finishing your antibiotics to help your gut flora bounce back.
Foods That Support Your Immune System
While no single food will cure an illness, certain nutrients keep your immune system functioning at its best while it fights off infection. Vitamin C is the most studied. Most clinical research on colds uses a daily dose of about 200 mg, which you can easily get from a single orange, a cup of strawberries, or a bell pepper. Megadoses beyond the tolerable upper limit of 2,000 mg per day offer no extra benefit and can cause digestive upset.
Protein matters more than people realize during illness. Your immune system builds antibodies from protein, and your body breaks down muscle tissue faster when fighting an infection. Even small servings of eggs, chicken, fish, beans, or Greek yogurt help keep that supply chain running. If your appetite is minimal, blending a simple smoothie with yogurt, banana, and a handful of frozen berries can pack protein, vitamin C, and fluids into something that goes down easy.