What to Eat When Sick: Feed a Cold or Starve a Fever?
Most of our kids are back in school, the weather is shifting colder, and that means... cold season is upon us. Between school germs, busy schedules, changing temperatures, and everything else this time of year brings, it is only a matter of time before someone in the house starts feeling under the weather. And when that happens, one question we hear often is, "What should I eat when I'm sick?" You have probably heard the old saying, "Feed a cold, starve a fever." But is that actually good advice? Not necessarily. When it comes to what to eat when sick, there is more nuance than simply eating when you have a cold and avoiding food when you have a fever.
This topic was inspired in part by key insights from Precision Nutrition's article on eating when sick, which explores the relationship between nutrition, immunity, appetite, and recovery. Lately, we have had several clients navigating the challenge of being sick while also trying to stay consistent with their nutrition and fitness goals. And we get it. Being sick can throw everything off. Your appetite may disappear, your energy is low, your normal meals sound terrible, and suddenly tracking your food feels like the last thing you want to do. But here is the important part: getting sick does not mean you have failed or lost your progress. Sometimes the best thing you can do for your goals is step back, rest, and give your body what it needs to recover.
What to Eat When Sick: Start With Your Body's Needs
Your immune system is constantly working to protect you from bacteria, viruses, and other potential threats. Nutrition plays an important role because immune cells require energy and a variety of nutrients to function properly. Protein, vitamins, minerals, essential fatty acids, and adequate overall energy all contribute to normal immune function.
This is one reason we do not recommend viewing food only through the lens of calories, macros, or weight loss. Those things can absolutely be useful tools, but there are times when the bigger picture matters more. When you are sick, your priorities may need to shift temporarily. Instead of asking, "How can I hit my calories perfectly?" you might ask, "What can I eat and drink that will help me stay nourished and hydrated while my body recovers?" That could mean eating smaller meals, choosing easier-to-digest foods, drinking more fluids, or temporarily being less concerned about hitting your exact macro targets. One or two days of imperfect tracking will not erase months of consistency.
Listen to Your Appetite When You're Sick
So, should you eat or fast when you are sick? The answer is not as simple as the old "feed a cold, starve a fever" saying suggests. Research has not established a universal rule that everyone should follow, and appetite can naturally change during illness. If you are hungry, eat. If you have very little appetite, do not force yourself to eat a large meal simply because you normally would. At the same time, prolonged periods of very low food intake can make it harder to meet your body's nutritional needs, so it is important to pay attention to hydration and nourishment as you recover.
Think about eating as an opportunity to support your body, not another box you have to check perfectly. If a full meal sounds awful, try something smaller. A smoothie, yogurt, toast with eggs, oatmeal, soup, fruit, rice, potatoes, or another simple food may be much more appealing than your normal meal. The goal is not perfection. The goal is to give your body something it can tolerate and use while it is working to recover.
Protein Still Matters During Illness
One nutrient we especially want to keep on your radar is protein. Your body relies on protein and amino acids for many important functions, including maintaining and repairing tissues and supporting immune function. That does not mean you need to force down a giant chicken breast when you have the flu. Instead, look for easy ways to include protein throughout the day. Eggs, Greek yogurt, cottage cheese, chicken soup, milk or a milk alternative with protein, smoothies with protein powder, beans, tofu, and other soft or easy-to-eat foods can all be options depending on what sounds good.
If you cannot hit your normal protein goal for a day or two, that is okay. Again, recovery comes first. Your nutrition does not have to look exactly the same when you are sick as it does when you are feeling your best.
Don't Forget Fluids and Electrolytes
When you are sick, hydration becomes especially important. Fever, sweating, vomiting, diarrhea, and simply not eating and drinking normally can all contribute to fluid loss. Water is a great place to start, but you can also get fluids from broth, soup, tea, fruit, smoothies, and other foods with high water content. If you are losing a significant amount of fluid through vomiting, diarrhea, or heavy sweating, an electrolyte drink may also be useful.
And yes, chicken soup can absolutely have a place here. It is warm, comforting, provides fluid, and can also provide protein, sodium, and other nutrients depending on how it is prepared. Sometimes the most helpful food is simply the one you can actually tolerate. When you are sick, there is no prize for forcing yourself to eat the foods you normally consider "healthy" if they sound completely unappealing.
Support Your Gut, Support Your Health
Your gut and immune system are closely connected, which is another reason your everyday eating habits matter. A diet that regularly includes a variety of whole foods, fiber-rich foods, fruits, vegetables, legumes, whole grains, nuts, seeds, and fermented foods can help support a healthy gut environment. Precision Nutrition highlights both prebiotic foods, which provide fuel for beneficial gut bacteria, and probiotic foods, which contain beneficial microorganisms.
Foods such as bananas, oats, beans, asparagus, onions, garlic, berries, and potatoes can provide prebiotic fibers. Yogurt with live cultures, kefir, sauerkraut, kimchi, and other fermented foods can provide probiotics. You do not need to turn this into another complicated nutrition project. Simply eating a variety of minimally processed foods on a regular basis is a great place to start, both when you are feeling well and when you are working your way back to feeling better.
Simple Foods Can Be the Best Foods When You're Sick
When you are sick, you do not need a pantry full of "immune-boosting" products. You need food that provides nourishment and that you actually want to eat. Warm soups, fruit, vegetables, oatmeal, rice, potatoes, eggs, yogurt, chicken, smoothies, tea, and other simple foods can make it easier to get some nutrition in when your appetite is low. Honey may also be soothing for a cough for adults and children over age one, while foods such as garlic, green tea, and berries can contribute helpful nutrients and plant compounds to your overall diet.
Supplements such as vitamin C, zinc, vitamin D, probiotics, or elderberry are sometimes used for immune support, but more is not always better. Supplements should not be viewed as a replacement for a balanced diet, adequate sleep, hydration, and other foundational habits. And if you have a medical condition, take medications, are pregnant, or have a weakened immune system, talk with your healthcare provider before adding supplements.
Your Macros Can Wait
This is probably the biggest takeaway we want our clients to remember: you do not have to perfectly hit your macros while you are sick. If tracking feels easy and helps you stay connected to your normal routine, great. But if you are exhausted, have no appetite, or are spending the day caring for sick kids, give yourself some flexibility. Your progress is not determined by one sick day, one missed workout, or a few meals that look different than usual. Your progress comes from what you consistently do over time.
So, if you are sick, give yourself permission to prioritize recovery. Drink your fluids. Eat what sounds good and what your body can tolerate. Include protein when you can. Get some fruits and vegetables in when they sound appealing. Rest. Sleep. And do not feel guilty for taking a break from your normal routine.
Even with great nutrition, regular exercise, adequate sleep, and healthy habits, illness happens. That is normal. The goal is not to avoid every cold that comes through your house. The goal is to build healthy habits that support your body most of the time, and then know how to adjust when life throws you a curveball.
Because sometimes what to eat when sick is not about finding the perfect food. It is about listening to your body, staying hydrated, getting enough nourishment to support recovery, and giving yourself permission to rest. And when you finally start feeling better, ease back into your normal routine. You do not need to "make up" for the days you missed. Just get back to the habits that have been working for you.
Your health is the goal. The macros, workouts, and everything else are tools to help you get there.
THIS POST AND IMAGES WERE INSPIRED BY KEY INSIGHTS BY PRECISION NUTRITION ON WHAT TO EAT WHEN YOU'RE SICK.
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Coach Jessica and Coach Laura are the co-founders of Designed For You Fitness. With more than 25 years of combined experience in fitness, nutrition, macro coaching, and women's health, they help women, especially moms, build sustainable habits that support long-term strength, confidence, and health.
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