Eating for Fluid Retention (Edema): Foods to Choose and Foods to Limit

October 18, 2026

Sometimes a health question sends us looking for answers — and reminds us how much our everyday food choices matter. That is the idea behind Eating for Your Body: use food to support what your body needs, without pretending food replaces medical care.

What is fluid retention?

Edema is swelling caused by excess fluid trapped in the body's tissues. It often shows up in the feet, ankles and legs, but it can occur elsewhere too. Edema has many possible causes, including high sodium intake, chronic venous insufficiency, heart failure, kidney disease, cirrhosis, pregnancy and certain medications. According to Mayo Clinic, reducing salt can help some forms of edema, but when an underlying disease is responsible, that condition needs treatment too.

The food change with the strongest evidence: lower sodium

Sodium pulls water with it. The American Heart Association notes that excess sodium can increase water retention and contribute to puffiness, bloating and fluid-related weight gain. It also reports that most sodium in the American diet comes from packaged, prepared and restaurant foods rather than the salt shaker.

For most adults, the American Heart Association recommends no more than 2,300 mg of sodium a day, with an ideal goal of 1,500 mg for many adults. That does not mean everyone with swelling should automatically aim for the same number. Medical conditions and medications can change what is appropriate. For example, the American Association for the Study of Liver Diseases (AASLD) says sodium restriction below 2,000 mg per day may be considered for people with cirrhosis and ascites, while also noting that this target must be balanced against the risk of malnutrition.

Foods to choose more often

The goal is not to find a magical “water-removing” food. It is to build meals that are naturally lower in sodium and rich in whole-food ingredients.

Fresh or plain frozen vegetables and fruit: spinach, broccoli, berries, citrus, cucumbers, tomatoes, sweet potatoes, avocados and similar foods are naturally low in sodium unless salty sauces or seasonings are added.
Beans and lentils: choose dried or no-salt-added versions when possible. If using regular canned beans, draining and rinsing them can reduce some of the sodium.
Fish and lean poultry: buy plain, unbrined versions and season them yourself rather than relying on heavily salted marinades.
Whole grains: oats, brown rice, quinoa, barley and other grains can be good choices when they are not packaged with high-sodium seasoning mixes.
Unsalted nuts and seeds: they add crunch, healthy fats and protein without the sodium load of many packaged snacks.
Flavor builders: lemon, lime, garlic, onion, vinegar, herbs, pepper, paprika, cumin, turmeric and other seasonings can make lower-sodium food taste satisfying.

What about potassium-rich foods?

Potassium and sodium work together in fluid and blood-pressure regulation. The American Heart Association notes that potassium-rich foods can help blunt some of sodium's effects. Foods such as potatoes, spinach, beans, fruit, yogurt and fish can contribute potassium as part of a balanced diet.

But more potassium is not automatically better for everyone. The National Institutes of Health Office of Dietary Supplements warns that people with kidney disease, heart failure, liver disease or certain medications — including potassium-sparing diuretics such as spironolactone — may need individualized potassium guidance. Potassium supplements and potassium-based salt substitutes should not be treated like harmless pantry items if you have one of those conditions.

Foods and substances to limit

Processed meats: deli meat, bacon, sausage, hot dogs and cured meats are often high in sodium.
Canned soups and instant meals: many soups, noodles, boxed mixes and frozen meals can contain a large share of a day's sodium in one serving.
Fast food and restaurant meals: sodium can add up quickly because it is used in seasoning, sauces, marinades and prepared ingredients.
Salty snacks: chips, crackers, salted nuts and similar foods can make it easy to overshoot sodium without noticing.
High-sodium sauces and condiments: soy sauce, bottled dressings, seasoning packets, gravies and some jarred sauces can be surprisingly concentrated sources.
Refined sweets and sugary drinks: they are not the main cause of edema, but the American Heart Association recommends minimizing added sugars from foods and beverages as part of an overall heart-healthy eating pattern. Think of this as a health-supporting swap, not a stand-alone edema treatment.
Alcohol when liver disease is involved: Mayo Clinic advises people with liver disease and ascites to avoid alcohol because it can worsen liver damage and complications.

Do “natural diuretics” really work?

Foods such as cucumber, watermelon, asparagus and citrus can absolutely fit into a healthy eating pattern. But no ordinary food reliably drains medically significant edema. Herbal teas and supplements marketed as “natural water pills” are a different story. Mayo Clinic says a healthy diet, reducing salt and regular activity are generally better approaches for ordinary fluid retention than taking herbs or supplements, and recommends talking with a healthcare professional before using an herbal product as a diuretic.

The Old2New way: make the meal work better for you

This is where small swaps can make a big difference without turning dinner into “diet food.”

Instead of canned cream soup, build a homemade creamy soup with a lower-sodium broth base.
Instead of deli turkey, roast or grill plain chicken or turkey and slice it yourself.
Instead of a seasoning packet, use garlic, onion, herbs, citrus and spices.
Instead of salted chips, try unsalted nuts, vegetables with dip or homemade roasted chickpeas.
Instead of a heavily salted jarred sauce, start with no-salt-added tomatoes and build your own flavor.
Instead of relying on takeout, keep a few simple proteins, vegetables and whole grains ready for quick bowls and skillet meals.

That is what Old2New is about: eat in a way that supports what your body needs while keeping the food familiar and enjoyable.

A quick note about fluids

Do not assume that drinking dramatically more water — or dramatically less — is always the answer. Fluid recommendations depend on the cause of swelling and on conditions such as heart, kidney and liver disease. In cirrhosis with ascites, for example, AASLD notes that fluid restriction is generally not necessary unless low blood sodium (hyponatremia) is present. Follow the fluid plan given by your own healthcare team.

When food is not enough

Persistent or unexplained swelling deserves medical evaluation because edema can come from problems involving the veins, heart, kidneys, liver, lymphatic system, medications and other causes. MedlinePlus lists limiting salt as one possible part of treatment, along with measures such as leg elevation, support stockings or prescribed diuretics depending on the cause.

Seek prompt medical care for swelling accompanied by shortness of breath, chest pain or an irregular heartbeat, or for sudden painful swelling in one leg, because these can signal more serious conditions. Mayo Clinic specifically identifies those symptoms as reasons for urgent evaluation.

Sources & references

Last updated: October 18, 2026.

Medical disclaimer: This article is for general educational purposes only. It is not intended to diagnose, treat, cure or prevent any medical condition and is not a substitute for care from a physician or other qualified healthcare professional. Edema can have many causes, and appropriate sodium, potassium and fluid intake can differ based on medical conditions, laboratory results and medications. If you have persistent swelling, heart, kidney or liver disease, or take a diuretic or other medication that affects fluid or electrolytes, follow the individualized guidance of your healthcare team.

Want to make everyday meals work better for your goals? Browse Old2New Cookbooks or use the Old2New app to transform familiar comfort food with better-for-you ingredients.