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Water retention, or oedema, means extra fluid is sitting in the body's tissues. You notice it as puffy ankles by evening, sock marks on the shins, a ring that will not come off or a puffy face on waking. It can also put a kilo or two on the scale overnight. The usual triggers are a big rice-and-roti meal, salty food, long hours of sitting or standing, and hot weather.
Day-to-day swelling that is gone by the next morning usually needs only movement, raised legs and less packaged salt. Swelling in one leg, swelling with breathlessness, or swelling that is still there when you wake up needs a doctor.
What is water retention, and how can you tell?
Your blood vessels leak a little fluid into the tissues all the time. Normally the lymph vessels and veins carry it back, and the kidneys pass any extra as urine. Water retention is what happens when more leaks out than gets collected. Gravity then decides where it settles: around the ankles after a day upright, around the eyes after a night lying flat.
Most people spot it before they have a name for it. The elastic of your socks leaves a ridge that is still there an hour later. Chappals that fitted in the morning pinch by six. Your wedding ring has to be soaped off. Pressing a thumb into the shin for a few seconds often leaves a small dip, which doctors call pitting.
A dip is a useful sign, though not a perfect one. Some long-standing swelling, such as lymphoedema or the puffiness of an underactive thyroid, does not pit at all. So if the swelling is new, stays for days or affects one side more than the other, let a doctor examine it rather than relying on the thumb test.
Why does the scale jump after a big meal?
Mostly because of glycogen, the carbohydrate your body keeps in the liver and muscles for quick energy. Kreitzman and colleagues described how each gram of it is stored with three to four grams of water. An adult carries several hundred grams of glycogen, so filling or draining that store can move the scale by a kilo or more in a day.
Think of a Sunday lunch of biryani, naan and kheer at a cousin's place. The carbohydrate tops up glycogen, the glycogen pulls water in with it, and Monday's reading is up by a kilo. By Wednesday, on ordinary meals, most of it has gone again. Nothing about your fat changed in those three days.
The same arithmetic explains the first week of a crash diet. Cut carbohydrate hard and glycogen empties, taking its water with it, so the scale drops quickly. Eat normally again and it comes straight back. If you weigh yourself, do it on waking, after the toilet and before tea, and look at the average of the week.
Sources: [1]
Does salt really cause water retention?
Indians eat a lot of it. Johnson and colleagues pooled 21 Indian studies and put average intake at about 11 g of salt a day. A newer review by Patil and colleagues found about 9 g, and put 61% of those studied above the limit. Both figures sit well over the WHO maximum of 5 g, about one level teaspoon.
The link to puffiness is less simple than it sounds. Heer and colleagues kept 32 healthy young men on a metabolic ward and raised their salt step by step. Blood volume rose, but total body water and body weight did not. In healthy kidneys, much of a salt load seems to be handled without visible swelling.
So why do people swell after a salty takeaway? Such meals tend to be large, rich in refined carbohydrate and eaten late, and the glycogen effect adds to whatever salt does. In people with high blood pressure, heart, kidney or liver disease, salt matters a great deal more, and cutting it is part of treatment.
For everyone, the easiest salt to cut is the hidden kind. Pickle, papad, namkeen, chips, instant noodles, sauces, processed cheese and restaurant gravies carry far more than the pinch you add at home. Cutting these few foods usually trims more salt than trying to cook without any.
Why do your feet swell when you sit or stand all day?
Your calf muscles act as a second heart for the legs. Each time they contract they squeeze blood and fluid back upwards. Sit still and the pump stops. Stranden measured calf volume in people sitting in an office chair locked in place. Over half an hour it grew by an average of 1.2%. When the chair let them rock and shift, calf volume shrank instead.
Standing still is no better. Kim and colleagues studied 39 workers who stood for more than eight hours a day. By the end of the shift their legs were bigger and more painful. Compression stockings worn during work, or a compression device after it, brought the swelling and pain down.
For a desk job, the fix is to keep the pump working. Get up for two or three minutes every half hour, even just to refill your water bottle. Under the desk, point and flex your feet twenty times every so often. In the evening, rest your legs on a cushion above the level of your heart for fifteen minutes. On long flights or bus journeys, walk the aisle when you can.
Shop staff, teachers, security guards and nurses who stand all day can ask a doctor about light compression stockings. They need to fit properly. People with poor circulation in the legs, or diabetes with numb feet, should have a doctor check first.
Which health problems cause water retention?
Lasting swelling, the kind that is still there in the morning, usually has a reason a doctor can find. Doctors usually check the heart first. When it pumps less strongly, fluid backs up into the legs and later the lungs, so swollen ankles come with breathlessness on stairs or when lying flat.
The kidneys are next. If they cannot clear salt and water, fluid builds up everywhere. Some kidney conditions leak protein into the urine, which turns it frothy and lowers the protein in the blood that holds fluid inside the vessels. The face and eyes often swell first. Liver disease lowers that same blood protein and can fill the belly with fluid.
An underactive thyroid makes the face and eyelids look full and the skin feel thick, along with tiredness, feeling cold and slow weight gain. Weak valves in the leg veins, often with visible varicose veins, let blood pool at the ankles. Some treatments for blood pressure, sugar, pain and hormones can also cause ankle swelling, so a doctor will ask what you take.
What does a day that keeps fluid moving look like?
Take Kavita, 41, who works in accounts in Indore and sits for most of her nine-hour day. She is an illustration, not a patient. By evening her sandals leave red marks and her rings are tight. Her morning ankles are slim, so this is the everyday kind of swelling.
Her fixes are small. A phone reminder gets her up every 30 minutes to fill her bottle or walk to a colleague's desk. Under the desk she circles her ankles while on calls. Lunch is home food rather than the canteen's gravy and papad, and the four o'clock namkeen becomes roasted chana or a fruit.
In the evening she walks for twenty minutes after dinner, which also helps her blood sugar, and then rests her legs on two pillows while she watches television. Dinner is earlier and lighter on rice. After a couple of weeks her sandals no longer leave marks. If they had not, or if one ankle had swelled more than the other, she would have gone for a check.
Sources: [5]
Can potassium-rich foods help with water retention?
Potassium works alongside sodium in the kidneys, and diets rich in it are linked with lower blood pressure. Aburto and colleagues reviewed 22 trials for the World Health Organization. Higher potassium intake lowered systolic pressure by about 3.5 points in adults, with the benefit seen in people who already had high blood pressure.
Direct trials on puffiness are lacking, so think of potassium as part of a sensible plate rather than a remedy. Good Indian sources are dal, rajma, chana, leafy greens such as palak and methi, potatoes and sweet potatoes cooked in their skins, bananas, oranges, tender coconut water and curd.
One caution matters. People with kidney disease, and some people on treatment for blood pressure or heart conditions, need to limit potassium rather than raise it. Check with your doctor before using salt substitutes, which are often potassium-based, or before adding large amounts of coconut water every day.
Sources: [7]
Is it water retention or fat on your legs?
Swelling from fluid shifts through the day. It is worst in the evening, better after sleep, and the skin over it often feels tight and shiny. Fat stays the same size from morning to night and feels soft. If your ankles are slim when you wake up and puffy by dinner, fluid is the likely reason.
At very high body weights the two can mix. Lymph vessels drain fluid from the legs, and heavy fat tissue around them can overload them. Greene and colleagues reported lymphoedema in the legs once body mass index passes roughly 50. In the woman whose case they followed, the swelling stayed even after she lost a great deal of weight.
That is a single case report, so it cannot say how often this happens. It does argue for starting weight loss well before swelling sets in for good. Leg swelling often has more than one cause, so the heart, kidneys, liver and thyroid deserve a look first. A doctor-led plan that starts with a home blood test and a doctor's review covers those. It then aims to lose up to 20% of body weight while keeping the leg muscles that pump fluid home.
Sources: [8]
Why are your face and eyes puffy in the morning?
When you lie flat for seven or eight hours, fluid no longer drains down to your feet. Some of it settles in the loose skin under the eyes and along the cheeks. A late, salty dinner, a couple of drinks, too little sleep, crying before bed or a dust allergy all add to it. For most people it eases within an hour or two of getting up.
A cold, damp cloth over the eyes for a few minutes helps, and so does sleeping with an extra pillow. Eating dinner earlier, with less pickle and papad, often makes the next morning look different. If your eyes itch and water, an allergy check is worth doing.
Puffiness that is still there at lunchtime, that is getting worse week by week, or that affects only one eye deserves a doctor's look. Kidney conditions that leak protein into the urine often show first around the eyes, and an underactive thyroid can make the whole face look full and heavy.