When you’re sick, your body needs more calories and fluids than usual, not less. Fever alone raises your metabolic rate, burning through energy faster with every degree your temperature climbs. The best foods to eat are ones that deliver hydration, easy-to-digest energy, and the nutrients your immune system needs to do its job. What that looks like depends on your symptoms.
Fluids Come First
Staying hydrated is the single most important thing you can do when you’re sick, regardless of what’s wrong. Baseline recommendations are about 15 cups of fluid a day for men and 11 cups for women, and illness increases that need. Fever, sweating, vomiting, and diarrhea all pull water out of your body faster than normal. Dehydration during illness can strain your kidneys, drop your blood pressure, and in severe cases become dangerous on its own.
Water is fine, but drinks that contain some salt and sugar help your body absorb fluid more efficiently. Broth-based soups, electrolyte drinks, and even diluted fruit juice all work. If you’re vomiting, don’t try to drink a full glass at once. Small sips of about an ounce every three to five minutes are easier to keep down and still add up over the course of an hour.
Best Foods for Cold and Flu Symptoms
When you have a respiratory illness like a cold or the flu, warm liquids do double duty. Chicken soup, for instance, delivers hydration, sodium, protein from the meat, and some carbohydrates if it includes noodles or rice. The warm steam also helps loosen nasal congestion. Broth on its own is a good fallback if you don’t have much appetite.
Beyond soup, focus on foods that pack nutrition without requiring much effort to eat. Scrambled eggs, oatmeal, yogurt, and soft fruits like bananas or applesauce are all solid choices. These give your body the protein and energy it needs to fuel an immune response. Your metabolism is running hotter than normal during a fever, so eating even when you don’t feel hungry helps your body keep up with that increased energy demand.
Citrus fruits, bell peppers, and strawberries are all rich in vitamin C. The effect isn’t dramatic, but consistent vitamin C intake during a cold can help you feel better roughly half a day sooner over a typical week-long illness. Zinc, found in meat, shellfish, legumes, and seeds, may shorten cold symptoms by a few days when taken early. Getting these nutrients from food is a practical way to support recovery without overthinking supplements.
What to Eat With an Upset Stomach
If you’re dealing with nausea, vomiting, or diarrhea, you’ve probably heard of the BRAT diet: bananas, rice, applesauce, and toast. These foods are gentle on the stomach, and they’re fine to eat. But following a strict BRAT-only diet is no longer recommended by organizations like the American Academy of Pediatrics. It’s too low in protein, fat, and several key nutrients. In children, sticking to BRAT for more than 24 hours may actually slow recovery.
Think of those foods as a starting point, not a complete plan. Other bland, soft options work just as well: plain crackers, boiled potatoes, steamed white fish, cooked carrots, or plain pasta. As soon as you feel able to eat more variety, do it. Your gut needs adequate nutrition to repair itself, and restricting your diet longer than necessary delays that process.
Ginger is one of the most reliable natural options for nausea. Research on ginger supplements suggests that taking the equivalent of about 1 gram per day for at least three days can meaningfully reduce vomiting. You don’t need capsules to get there. Fresh ginger steeped in hot water as tea, or even ginger chews, can help settle your stomach enough to get other food down.
Protein Supports Your Immune System
Your immune system runs on protein. Antibodies, the molecules that target and neutralize viruses and bacteria, are built from amino acids. When you’re sick and not eating enough protein, your body has fewer building blocks to mount a strong defense.
You don’t need to calculate exact grams, but aim to include some protein at every meal or snack. Eggs, Greek yogurt, cheese, nut butter, chicken, fish, and beans are all easy options that don’t require heavy cooking. If your appetite is low, even a glass of milk or a handful of almonds adds meaningful protein. People who are immunocompromised or fighting a serious illness may need significantly more protein than usual, sometimes up to double the standard recommendation.
Foods and Drinks to Limit
High-sugar foods and drinks aren’t doing you any favors when you’re fighting an infection. Elevated blood sugar puts extra stress on your body and forces your immune system to work harder. It can also trigger inflammation, which diverts immune resources away from fighting the actual illness. This doesn’t mean you need to avoid all sugar, but relying on soda, candy, or sweetened juices as your main source of calories is counterproductive.
Alcohol is dehydrating and suppresses immune function, so skip it entirely while you’re sick. Very greasy or heavily spiced foods can worsen nausea and are harder to digest when your gut is already irritated. Caffeine in moderate amounts is fine if you tolerate it, but large quantities can contribute to dehydration, so balance coffee or tea with water or electrolyte drinks.
Dairy is worth mentioning because many people believe it worsens mucus production during a cold. There’s no strong evidence for this. If milk, yogurt, or cheese feel comfortable and help you get calories and protein in, go ahead and eat them.
How to Eat When You Have No Appetite
Loss of appetite is one of the most common symptoms across nearly every type of illness. Your body releases signaling molecules during infection that suppress hunger, which is a normal part of the immune response. But skipping meals entirely leaves your body short on fuel at the exact moment it needs more.
Instead of forcing three full meals, eat small amounts frequently. A few spoonfuls of yogurt, half a banana, a cup of broth, a piece of toast with peanut butter. Spacing these out every couple of hours keeps energy and nutrients trickling in without overwhelming a sensitive stomach. Calorie-dense liquids like smoothies, milk, or drinkable yogurt are especially useful when chewing and swallowing feel like too much effort.
As your symptoms improve and your appetite returns, gradually reintroduce your normal diet. There’s no need for a slow, staged reintroduction unless you’re recovering from significant vomiting or diarrhea. Your body will tell you when it’s ready for more substantial food, and eating well during recovery helps you regain strength faster.