Water retention happens when excess fluid builds up in your body’s tissues instead of being filtered out through your kidneys. The good news: most mild cases respond well to changes in diet, movement, and daily habits. The strategies below target the actual mechanisms that cause your body to hold onto fluid, from the hormones that tell your kidneys to keep sodium to the muscle contractions that push fluid back into circulation.
Cut Back on Sodium (and Know Your Limit)
Sodium is the single biggest dietary driver of water retention. When sodium levels in your blood rise, your body holds onto water to dilute it back to a safe concentration. The World Health Organization recommends staying under 2,000 mg of sodium per day, which works out to just under a teaspoon of table salt. Most people consume well over that, largely from processed and restaurant foods rather than the salt shaker at the table.
Bread, deli meats, canned soups, cheese, soy sauce, and frozen meals are some of the worst offenders. Checking nutrition labels for sodium content and cooking more meals at home gives you direct control. You don’t need to go sodium-free. Your body needs some sodium to function. The goal is staying closer to that 2,000 mg ceiling rather than the 3,500+ mg many people consume daily.
Eat More Potassium-Rich Foods
Potassium works as sodium’s counterbalance. It signals your kidneys to release more sodium into your urine, and when sodium leaves, water follows. Bananas get all the credit, but plenty of foods pack more potassium per serving: potatoes, sweet potatoes, spinach, avocados, beans, yogurt, and salmon. Coconut water is another easy source.
Rather than fixating on a specific number, the practical goal is shifting your ratio. If most of your meals are high in sodium and low in potassium, your body stays in fluid-hoarding mode. Swapping processed snacks for whole foods naturally tips the balance in the right direction.
Reduce Refined Carbohydrates
This one surprises people. Refined carbs like white bread, pastries, sugary drinks, and white rice cause rapid spikes in insulin. Insulin doesn’t just manage blood sugar. It also acts directly on your kidneys, stimulating them to reabsorb sodium back into the bloodstream instead of excreting it. Research published in Kidney International confirmed that insulin decreases sodium excretion through a specific signaling pathway in the kidney’s filtering tubes. More sodium retained means more water retained.
This is one reason people often notice dramatic early weight loss on low-carb diets. Much of that initial drop is water that was being held in place by chronically elevated insulin. You don’t need to go low-carb to benefit. Simply replacing refined carbs with whole grains, vegetables, and legumes keeps insulin levels more stable and reduces that kidney signal to hoard sodium.
Drink More Water, Not Less
It sounds counterintuitive, but drinking less water makes retention worse. When your body senses even mild dehydration, it releases an antidiuretic hormone called vasopressin. This hormone tells your kidneys to conserve water by pulling it back from your urine into your bloodstream. Your body’s osmoreceptor cells are remarkably sensitive: a change in blood concentration as small as 1% is enough to trigger vasopressin release. On the flip side, drinking enough water to bring that concentration down by just 1% powerfully suppresses the hormone.
In practical terms, this means consistent, moderate water intake throughout the day keeps vasopressin low and lets your kidneys excrete fluid normally. Chugging a huge amount at once is less effective than sipping steadily. A good baseline for most adults is around 2 to 3 liters per day, adjusted upward if you exercise, live in a hot climate, or eat a high-sodium diet.
Get Enough Protein
Protein in your diet directly affects how well your blood vessels hold onto fluid. A protein called albumin makes up 75 to 80% of the pressure that keeps fluid inside your blood vessels rather than leaking out into surrounding tissues. When blood albumin drops too low, fluid seeps into the spaces between your cells, causing visible puffiness, especially in the legs, ankles, and around the eyes.
Healthy albumin levels sit between 3.5 and 4.5 grams per deciliter of blood. You don’t need to get this tested unless a doctor suspects a problem, but consistently eating too little protein, whether from extreme dieting, very restrictive eating patterns, or poor appetite, can gradually lower albumin and worsen retention. Including a protein source at each meal (eggs, poultry, fish, legumes, dairy, tofu) keeps production steady.
Move Your Body, Especially Your Legs
Your lymphatic system is responsible for draining excess fluid from tissues and returning it to your bloodstream. Unlike your circulatory system, it has no pump. It relies entirely on muscle contractions and body movement to push fluid through its network of vessels. Sitting or standing in one position for hours lets fluid pool in your lower legs and feet.
You don’t need intense exercise to get results. Walking is one of the most effective options because the calf muscles act as a pump with every step. Memorial Sloan Kettering Cancer Center recommends a set of simple movements for people dealing with fluid buildup in the legs: seated marches (lifting your knees alternately while sitting), ankle circles in both directions, heel and toe raises, mini squats, and standing hamstring curls. Doing these twice a day, about 10 repetitions each, can meaningfully improve fluid clearance. Deep diaphragmatic breathing also helps by creating pressure changes in the abdomen that draw lymphatic fluid upward from the lower body.
If you work at a desk, setting a timer to stand and walk for a few minutes every hour makes a noticeable difference over the course of a day.
Try Compression Socks
Compression socks apply graduated pressure to your lower legs, gently squeezing fluid back up toward your heart. For mild, everyday water retention, low-compression socks (under 20 mmHg) are available over the counter and are a good starting point. Medium compression (20 to 30 mmHg) is also available without a prescription and works well for more persistent swelling, long flights, or jobs that require standing all day.
Put them on first thing in the morning before swelling has a chance to build up. They’re most effective when combined with movement rather than worn while sitting still for hours.
Consider Magnesium
Magnesium supplementation has shown specific benefits for premenstrual water retention. A randomized, double-blind, placebo-controlled study published in the Journal of Women’s Health found that 200 mg of magnesium daily reduced symptoms of fluid retention by the second menstrual cycle. The effect wasn’t immediate, so consistency matters more than timing.
Beyond supplementation, magnesium-rich foods like dark chocolate, nuts, seeds, leafy greens, and whole grains contribute to your intake. Many people fall short of the recommended daily amount (around 310 to 420 mg depending on age and sex), so even improving dietary intake can help.
Natural Diuretics That Have Evidence
Dandelion leaf extract is one of the few herbal diuretics tested in human subjects. In a study published in The Journal of Alternative and Complementary Medicine, participants who took 8 mL of dandelion leaf extract three times in a single day showed increased urinary frequency and output. The evidence is limited to small studies, but dandelion tea or supplements are generally well tolerated and may offer mild relief.
Other foods with natural diuretic properties include celery, cucumber, watermelon, asparagus, and parsley. Coffee and tea also increase urine output in the short term, though your body adapts to the caffeine effect over time.
When Swelling Points to Something Bigger
Most water retention is harmless and responds to lifestyle changes. But certain patterns suggest an underlying medical issue. Pitting edema, where pressing your finger into swollen skin leaves a visible dent that takes time to fill back in, can signal heart, kidney, or liver problems. The deeper the dent and the longer it takes to refill, the more concerning it is.
Other warning signs include swelling that develops rapidly or affects only one leg (which could indicate a blood clot), shortness of breath or coughing alongside swelling, unexplained weight gain over days or weeks, and skin over the swollen area that looks shiny or feels tight. Swelling that doesn’t improve after a week of the strategies above, or that gets progressively worse, is worth getting evaluated.