Reducing water retention comes down to a handful of strategies that work together: adjusting what you eat, staying well hydrated, moving your body, and using a few targeted supplements. Most fluid retention is temporary and tied to diet, hormones, or inactivity. Here’s what actually helps and why.
How Your Body Holds Onto Water
About 60% of your body weight is water, and roughly a third of that sits outside your cells in what’s called extracellular fluid. The volume of this fluid is directly tied to how much sodium your body is holding. When sodium levels rise, your body retains water to keep concentrations balanced. When sodium drops, the kidneys release both salt and water. This is the core mechanism behind most everyday bloating and puffiness.
Potassium plays the opposite role. It’s the dominant mineral inside your cells, and it counterbalances sodium’s effect on fluid outside your cells. A cellular pump constantly shuffles sodium out and potassium in, and the ratio between the two minerals largely determines how much water you’re carrying around.
Cut Sodium, Add Potassium
The World Health Organization recommends staying under 2,000 mg of sodium per day, which is just under a teaspoon of salt. The typical Western diet delivers 2,300 to 4,600 mg daily, so most people are well over the line. The excess triggers your body to hold water to dilute the sodium, and you feel it as swollen fingers, tight rings, puffy ankles, or a number on the scale that jumped overnight.
Processed and packaged foods are the biggest culprits: deli meats, canned soups, frozen meals, sauces, and restaurant food. Cooking at home with whole ingredients is the single most effective way to slash sodium intake. Season with herbs, citrus, vinegar, and spices instead of reaching for the salt shaker.
At the same time, eating more potassium-rich foods helps your kidneys flush excess sodium. Bananas get all the credit, but sweet potatoes, spinach, avocados, beans, and yogurt are all excellent sources. The goal isn’t a specific ratio so much as tipping the balance: less sodium in, more potassium in, and your kidneys will handle the rest.
Drink More Water, Not Less
It sounds counterintuitive, but drinking more water helps reduce water retention. When you’re dehydrated, your body senses rising blood concentration and responds by releasing a hormone called vasopressin, which tells your kidneys to hold onto water. Your urine gets concentrated, and fluid stays locked in your tissues.
When you drink enough, plasma concentration drops, vasopressin secretion falls, and your kidneys produce dilute urine, flushing out both water and excess sodium. Staying consistently hydrated throughout the day keeps this system running smoothly. You don’t need to force gallons. Aim for pale yellow urine as a practical signal that you’re on track.
Move Your Body and Elevate Your Legs
Sitting or standing in one position for hours lets gravity pool fluid in your lower legs and feet. Walking, even briefly, activates your calf muscles, which act as pumps pushing fluid back up through your veins. Any form of exercise works: a 20-minute walk, cycling, swimming, or simply getting up from your desk every hour.
When you’re resting, elevating your legs above heart level for about 15 minutes is one of the simplest ways to reduce lower-leg swelling. Doing this three to four times a day makes a noticeable difference, especially if your job involves long periods of sitting or standing. Prop your legs on pillows while lying down, or rest them against a wall.
Compression Stockings for Persistent Swelling
If your legs or ankles swell regularly, graduated compression stockings apply gentle pressure that prevents fluid from pooling. They’re tightest at the ankle and gradually loosen toward the knee or thigh, encouraging blood and fluid to move upward. Medical compression stockings come in four pressure classes, ranging from 18 to 21 mmHg for mild support up to 49 mmHg or higher for severe swelling. The lightest class is available over the counter and works well for everyday fluid retention from sitting, travel, or mild puffiness. Higher classes require a fitting and are typically prescribed for more significant vein or lymph issues.
Magnesium and Vitamin B6
Magnesium is involved in hundreds of processes that regulate fluid balance, and many people don’t get enough of it. A clinical study found that 200 mg of supplemental magnesium daily improved water retention linked to PMS. Good food sources include dark chocolate, nuts, seeds, leafy greens, and whole grains, but a supplement can fill the gap if your diet falls short.
Vitamin B6 has also shown promise for hormonal water retention. In a randomized controlled trial of 94 women, 80 mg of B6 taken daily over three menstrual cycles significantly reduced bloating along with other PMS symptoms like irritability and anxiety. A broader meta-analysis of nine trials involving nearly 1,000 women confirmed that B6 outperformed placebo for PMS symptoms overall, though many of the individual studies were small. Both of these nutrients are generally well tolerated at these levels, but staying within recommended upper limits is important because high-dose B6 over long periods can cause nerve issues.
Natural Diuretics
Dandelion leaf extract is the most studied herbal option for water retention. In a human trial, 17 subjects who took dandelion leaf extract three times in a single day saw a significant increase in urination frequency, jumping from an average of 8 times per day to 9 times. Urine output also increased in the hours following each dose. It’s a mild effect, not dramatic, but it may help take the edge off bloating when combined with other strategies.
Other foods with mild natural diuretic properties include celery, cucumber, watermelon, asparagus, and parsley. Coffee and tea also increase urine output in the short term. None of these are powerful enough to treat medical edema, but they can nudge your body toward releasing a bit of extra fluid on bloated days.
Hormonal Water Retention
Many women notice a predictable pattern of water retention in the days before their period. Rising and falling estrogen and progesterone shift how the kidneys handle sodium, and the result is often 2 to 5 pounds of temporary water weight along with breast tenderness, abdominal bloating, and swollen hands or feet. This type of retention resolves on its own once menstruation begins.
The strategies above, particularly reducing sodium, supplementing with magnesium and B6, staying active, and keeping hydration consistent, are especially effective for cyclical bloating. Tracking your cycle can help you anticipate the worst days and start adjusting your diet a few days before symptoms typically peak.
When Swelling Signals Something Bigger
Most water retention is harmless and temporary. But persistent or worsening swelling, especially when it appears on both sides of the body, can point to heart, kidney, or liver problems. Pitting edema, where pressing a finger into swollen skin leaves a visible dent that takes time to spring back, suggests excess fluid with low protein content and is associated with conditions like heart failure or deep vein thrombosis.
Swelling that comes with shortness of breath, rapid weight gain over a few days, reduced urine output, yellowing skin, or chest discomfort warrants prompt medical evaluation. These signs suggest the fluid retention is a symptom of an underlying condition rather than a dietary or hormonal issue you can manage on your own.