Reducing water retention comes down to a handful of straightforward strategies: adjusting your sodium and potassium intake, staying well hydrated, moving your body regularly, and in some cases adding specific minerals or herbs. Most fluid retention is temporary and responds well to dietary and lifestyle changes, though persistent or severe swelling can signal something that needs medical attention.
Why Your Body Holds Onto Water
Your kidneys constantly fine-tune how much water stays in your body versus how much leaves as urine. The main controller is a hormone called vasopressin (also known as antidiuretic hormone). When your body senses it needs to conserve fluid, whether from dehydration, high sodium intake, or low blood pressure, vasopressin tells your kidneys to reabsorb more water instead of sending it to your bladder.
A second system kicks in when blood pressure drops. Your kidneys trigger a hormonal chain reaction that ultimately produces aldosterone, a hormone that tells the kidneys to hold onto sodium. Since water follows sodium, the net effect is your body retaining fluid that’s roughly the same concentration as your other bodily fluids. This is why salty meals so reliably cause puffiness the next morning: extra sodium pulls extra water along with it.
Cut Back on Sodium
Sodium is the single biggest dietary driver of water retention. The World Health Organization recommends less than 2,000 mg of sodium per day, equivalent to just under a teaspoon of table salt. Most people consume well above that, largely from processed and restaurant foods rather than the salt shaker on the table.
Bread, deli meats, canned soups, frozen meals, cheese, and condiments like soy sauce are common culprits. Reading nutrition labels is the most effective first step. Swapping processed foods for home-cooked meals gives you direct control over how much salt goes in, and many people notice a visible difference in bloating within a few days of reducing their intake.
Eat More Potassium-Rich Foods
Potassium works as a counterbalance to sodium. It helps your kidneys excrete more sodium in urine, which in turn releases the water that was tagging along. Foods high in potassium include bananas, avocados, tomatoes, sweet potatoes, spinach, and beans. Most people don’t get enough potassium from their diet, so simply eating more fruits and vegetables can shift the sodium-potassium balance in a direction that reduces fluid buildup.
Drink More Water, Not Less
It sounds counterintuitive, but drinking more water can actually reduce water retention. When you’re consistently under-hydrated, your body ramps up vasopressin production to hold onto every drop it can. Research published in Annals of Nutrition and Metabolism found that people drinking less than 1.2 liters per day had significantly higher vasopressin levels compared to those drinking over 2 liters per day. In a six-week study of 54 adults, increasing water intake measurably lowered vasopressin levels, essentially telling the kidneys they could relax and let more fluid pass through.
The practical takeaway: if you’re prone to bloating and you’re also a light drinker of water, gradually increasing your intake to around 2 liters a day may help your body stop hoarding fluid.
Magnesium and Vitamin B6
Magnesium plays a role in hundreds of cellular processes, including fluid balance. Good sources include nuts, whole grains, dark chocolate, and leafy greens like spinach. Many people, especially women, fall short of their daily magnesium needs, and low magnesium status has been linked to worsened premenstrual bloating.
Vitamin B6 has more direct evidence for period-related water retention specifically. A randomized controlled trial in 94 women found that taking 80 mg of B6 daily over three menstrual cycles significantly reduced bloating along with other PMS symptoms like anxiety and irritability. You can get B6 from bananas, potatoes, chickpeas, walnuts, and tuna, though the amounts used in that trial are higher than what diet alone typically provides.
Move Your Body, Especially Your Legs
Physical activity is one of the most effective ways to reduce lower-body swelling. Your lymphatic system, which drains excess fluid from tissues, doesn’t have its own pump. It relies on muscle contractions to push fluid along. This is why sitting on a long flight or at a desk all day often leaves your ankles puffy by evening.
You don’t need intense exercise. Walking is excellent. Memorial Sloan Kettering recommends a series of simple movements for people dealing with leg swelling: seated marches (lifting one knee at a time), ankle circles in both directions, heel and toe raises while seated, mini squats, and standing side kicks. Doing these twice a day, about 10 repetitions each, can meaningfully improve fluid drainage. Deep belly breathing also helps by creating pressure changes in your abdomen that encourage lymph flow upward toward your chest.
If you have a desk job, even standing up and walking for two minutes every hour makes a difference. Elevating your legs above heart level when resting is another simple way to let gravity assist drainage.
Natural Diuretic Foods and Herbs
Dandelion leaf is one of the few herbal diuretics with human trial data behind it. A study in The Journal of Alternative and Complementary Medicine found that dandelion leaf extract significantly increased urination frequency within five hours of the first dose in 17 subjects. Dandelion contains at least nine compounds that may contribute to this effect, including potassium, magnesium, and several plant antioxidants, potentially working through multiple pathways rather than a single mechanism.
Other herbs traditionally used for water retention include parsley, hibiscus, fennel, corn silk, and nettle. These are generally consumed as teas. While they have less clinical trial data than dandelion, they have long histories of use and are considered safe in food-level amounts. Hibiscus tea in particular is widely available and pleasant to drink cold.
Choose Whole Grains Over Refined Carbs
Refined carbohydrates like white bread, pastries, and sugary snacks cause rapid spikes in insulin, which signals your kidneys to retain sodium. Fiber-rich whole grains like oats, brown rice, and whole wheat bread produce a slower, more gradual insulin response. Swapping refined carbs for whole grains won’t produce dramatic overnight results, but it contributes to a steadier fluid balance over time and pairs well with the other strategies here.
Compression Stockings for Leg Swelling
If your water retention shows up primarily in your legs and ankles, compression stockings apply gentle pressure that helps push fluid back up toward your heart. Low-compression stockings (under 20 mmHg) are available over the counter and work well for people who stand or sit for long periods, or during pregnancy. Medium-compression stockings (20 to 30 mmHg) and higher require a prescription and are used for more persistent swelling.
For best results, put them on in the morning before swelling builds up during the day. They’re most effective when combined with regular movement rather than used as a substitute for it.
When Swelling Signals Something Serious
Most water retention is harmless and responds to the strategies above. But certain patterns warrant prompt medical attention. Skin that looks stretched or shiny, or that holds a visible dimple after you press it with your finger, should be evaluated by a provider. Swelling paired with shortness of breath, chest pain, or an irregular heartbeat needs immediate care, as these can indicate heart or kidney problems.
Swelling in one leg only, especially after a long period of sitting like a flight, combined with pain that doesn’t go away, can be a sign of a deep vein blood clot. This is a medical emergency. Swelling that develops gradually over weeks or months without an obvious cause, such as a high-sodium diet or prolonged sitting, also deserves investigation to rule out underlying conditions affecting your heart, kidneys, liver, or thyroid.