When you’re sick, your body needs more fluids than usual and enough calories to fuel your immune system, even if eating feels like the last thing you want to do. The best choices are easy to digest, keep you hydrated, and deliver nutrients that support recovery. Here’s what actually helps and what you can skip.
Fluids Come First
Dehydration is the fastest way to make any illness feel worse. Fever, sweating, vomiting, and diarrhea all pull water and electrolytes out of your body faster than normal. Women generally need about 9 cups of fluid per day and men about 12 cups under normal conditions, so during illness you’ll likely need more than that to keep up.
Water is fine for mild illnesses like a head cold. But if you’re losing fluids through vomiting or diarrhea, plain water isn’t enough. You also need electrolytes like sodium, potassium, and chloride to help your cells actually absorb and hold onto the water you’re drinking. Oral rehydration solutions (like Pedialyte) contain a precise balance of electrolytes and sugar designed for this purpose. Sports drinks work in a pinch, though they contain more sugar and less sodium than ideal. Coconut water is another option that’s naturally high in potassium.
Sip small amounts frequently rather than gulping large volumes, especially if your stomach is uneasy. A few ounces every 15 to 20 minutes is easier for your body to handle than a full glass at once.
Why Chicken Soup Actually Works
Chicken soup isn’t just comfort food. A well-known lab study published in the journal CHEST found that chicken soup significantly inhibited the movement of neutrophils, a type of white blood cell involved in inflammation. This effect was concentration-dependent, meaning even diluted soup had measurable anti-inflammatory activity. That mild anti-inflammatory action may be one reason soup helps ease the congestion, sore throat, and general misery of upper respiratory infections.
Beyond the immune effects, soup checks several practical boxes at once. The warm broth delivers fluids and sodium. Chicken provides protein, which your body needs to build and repair immune cells. Vegetables add vitamins. And the steam from a hot bowl can temporarily open congested nasal passages. If you’re too tired to cook, even a simple store-bought broth is a solid starting point.
Best Foods When Your Appetite Is Low
You don’t need to force a full meal when you’re sick, but your immune system does need fuel. Protein is especially important because it supplies amino acids like glutamine that are critical for immune cell growth and function. Good options when your stomach can handle them include eggs, yogurt, soft fish, and shredded chicken. These are all easy to chew and digest without requiring much energy.
For carbohydrates, reach for foods that are bland and gentle: oatmeal, toast, rice, crackers, or mashed potatoes. You may have heard of the BRAT diet (bananas, rice, applesauce, toast) as the go-to for stomach illness. It’s no longer recommended as a strict protocol. The American Academy of Pediatrics considers it too restrictive for children, and Cleveland Clinic notes it lacks calcium, vitamin B12, protein, and fiber. Following it for more than a day or two can actually slow recovery. Those foods are fine as part of your diet, but broaden your choices as soon as you feel up to it.
Fruits like bananas and applesauce are still useful because they’re gentle on the stomach and provide potassium, which you lose during vomiting and diarrhea. Avocado offers healthy fats and potassium in a soft, easy-to-eat form.
Warm Drinks for Sore Throats and Congestion
Warm liquids soothe irritated throat tissue and help loosen mucus. Herbal teas are a good vehicle for this, and some offer specific benefits.
Peppermint tea contains menthol, which activates cold-sensing receptors in the throat and nasal passages, creating a cooling sensation that numbs irritation. Menthol also modulates pain signals by affecting certain nerve channels, which is why it shows up in cough drops and throat lozenges. Drinking it as a warm tea gives you the throat-soothing effect plus hydration.
Ginger tea can help with nausea. Ginger appears to work by blocking serotonin receptors in the gut and central nervous system, reducing the signals that trigger the urge to vomit. Most clinical research has used between 250 mg and 1 g of powdered ginger root per dose, taken one to four times daily. A thumb-sized piece of fresh ginger steeped in hot water for 10 minutes gives you a roughly equivalent amount.
Warm water with honey is one of the simplest and most effective remedies for a cough. Honey coats and soothes the throat, and it’s safe for anyone over the age of one. For children ages 1 and older, half a teaspoon to one teaspoon is the typical amount. Adults can use a tablespoon stirred into tea or taken straight. Never give honey to a baby under 12 months due to the risk of infant botulism.
Key Nutrients That Support Your Immune System
Several specific nutrients play outsized roles in immune function, and illness is the worst time to fall short on them. Vitamin C helps white blood cells work properly and is found in citrus fruits, strawberries, bell peppers, and kiwi. You don’t need megadoses; a couple of servings of fruit throughout the day covers it. Vitamin D supports immune defenses and is harder to get from food alone, though fortified milk, eggs, and fatty fish contribute. Zinc is involved in the development of immune cells and is found in meat, shellfish, legumes, and seeds.
You may have seen claims about zinc lozenges shortening colds. Some studies suggest a modest benefit, but even the Mayo Clinic notes there’s no consensus on the best form, dose, or timing. If you want to try them, starting within 24 hours of symptom onset appears to matter most, but don’t expect dramatic results.
Milk, Dairy, and the Mucus Myth
Many people avoid dairy when sick because they believe it increases mucus production. It doesn’t. When milk mixes with saliva in your mouth, it creates a slightly thick coating that can briefly linger on the tongue and throat. That sensation gets mistaken for extra phlegm, but your body isn’t actually producing more mucus. A study in children with asthma found no difference in symptoms whether they drank dairy milk or soy milk. If yogurt, milk, or cheese sounds appealing and your stomach tolerates it, go ahead. Yogurt in particular provides protein, probiotics, and calories in an easy-to-eat form.
What to Avoid
Some foods and drinks make symptoms worse or slow recovery. Alcohol is a diuretic that accelerates dehydration and suppresses immune function. Coffee in large amounts can also dehydrate you, though a small cup is unlikely to cause problems if you’re drinking plenty of other fluids alongside it.
Greasy, fried, and heavily spiced foods are harder to digest and can worsen nausea or diarrhea. Sugary drinks like soda provide fluid but little nutritional value, and high sugar concentrations can actually pull water into the intestines and make diarrhea worse. Crunchy or acidic foods like chips, crackers with sharp edges, and citrus juice can irritate a raw, sore throat.
If you’re congested, very hot or very spicy foods might temporarily open your sinuses, but they can also trigger a runny nose and stomach discomfort. Use your own tolerance as a guide.
A Simple Sick-Day Eating Plan
When illness hits, the practical challenge is often just knowing what to reach for. In the first hours when you feel worst, focus purely on fluids: water, broth, oral rehydration drinks, and herbal tea with honey. Sip constantly in small amounts.
Once you can tolerate food, start with something bland and soft. A bowl of oatmeal, a few bites of banana, some plain toast. As your appetite returns, add protein: scrambled eggs, yogurt, or a bowl of chicken soup. Don’t worry about eating “perfectly.” Your body can catch up on a balanced diet once you’re feeling better. The priority while sick is staying hydrated, getting enough protein and calories to support your immune system, and choosing foods that don’t make your symptoms worse.