Fat Flush Water Recipe: What It Does and Doesn't Do

Fat Flush Water: A Fruit-Infused Recipe, Not a Fat Burner

"Fat flush water" is a jug of water infused with tangerine, grapefruit, cucumber and mint. It is a pleasant, low-calorie way to drink more during the day, and the recipe is below. What it cannot do is flush fat out of your body. No drink can, because that is not how the body gets rid of fat: when fat is burned for energy, most of it leaves through your lungs as carbon dioxide.

That does not make the recipe pointless. If a fruity jug in the fridge helps you swap a fizzy drink or a sweetened juice for water, that is a genuine, if modest, win. This guide gives you the recipe, explains what each ingredient really contributes, clears up where fat goes when you lose weight, and covers one important safety point about grapefruit and medicines.

The fat flush water recipe

You will need:

2 litres (about 64 oz) of water
1 tangerine, peeled and separated into segments
Half a grapefruit, sliced
1 cucumber, sliced
4 peppermint or spearmint leaves, lightly bruised
Ice (optional)

Wash the fruit and cucumber well, place everything in a large jug, top up with water and refrigerate. Many people make it in the evening so the flavour develops overnight, then drink it through the next day. For a stronger taste, squeeze a little of the grapefruit juice into the water; for a milder one, leave the peel out, since citrus pith can turn bitter after several hours.

Keep the jug in the fridge and make a fresh batch rather than topping up the same fruit for days. Cut fruit sitting in water is a good environment for bacteria once it is warm, so it is sensible to finish or discard it within about a day.

What each ingredient actually does

Recipes like this are often sold with a list of near-magical claims. Here is a calmer look at each ingredient.

Tangerine

Tangerines add sweetness and a little vitamin C. A few segments soaking in water release flavour and only a small share of their nutrients, so the drink is not a meaningful vitamin source. Claims that the fruit in a jug of water will raise fat burning during exercise or fix blood sugar are not supported.

Grapefruit

Grapefruit has long been linked with diets, through decades of fad "grapefruit diets", but there is no good evidence that it burns fat. Its real contribution here is a sharp, refreshing taste. It also comes with a caution for anyone on medication, explained below.

Cucumber

Cucumber is mostly water and gives the drink a cool, spa-like flavour. It is sometimes described as a diuretic that reduces bloating. Even if a jug of cucumber water made you pass a little more urine, that would only shift water, not fat, and the weight would return as soon as you drank again.

Mint

Mint makes the water taste fresher, which may simply help you drink more of it. Peppermint has been studied for digestive comfort, mostly as concentrated oil capsules rather than a few leaves in a jug, so expect flavour rather than treatment.

Where fat really goes when you lose weight

When you use more energy than you take in, your body breaks down stored fat. Fat molecules are made of carbon, hydrogen and oxygen, and burning them for energy turns them into carbon dioxide and water.

In a 2014 paper in The BMJ, physicist and science educator Ruben Meerman and lipid researcher Andrew Brown of the University of New South Wales worked out the numbers. To burn 10 kg of fat, the body needs about 29 kg of oxygen, and the process produces about 28 kg of carbon dioxide and 11 kg of water. Around 84% of the lost fat leaves as carbon dioxide that you breathe out, and about 16% leaves as water through urine, sweat, breath and other fluids.

The authors pointed out that many people wrongly believe fat turns into muscle or leaves through the bowels. In reality your lungs do most of the work. That is why no drink can "flush" fat: the only way to lose it is to burn it, which comes down to eating a little less, moving a little more, or both.

How much water you actually need

Staying well hydrated is good for you, even if it is not a fat burner. The NHS Eatwell Guide suggests about 6 to 8 cups or glasses of fluid a day, and stresses that this is only a guide. A practical check is the colour of your urine: a clear, pale yellow usually means you are drinking enough.

Water, lower-fat milk and lower-sugar drinks, including tea and coffee, all count. You will need more in hot weather, during long periods of exercise, during pregnancy or breastfeeding, and when you are unwell. Fruit juice and smoothies are high in sugar, so the NHS recommends keeping them to one small glass, about 150 ml, a day with a meal. Swapping sugary drinks for water or an infused version like this one is one of the easiest changes you can make.

Grapefruit and medicines: an important caution

Grapefruit can interfere with a number of prescription drugs. The US Food and Drug Administration explains that grapefruit juice blocks an enzyme in the small intestine, called CYP3A4, that normally breaks many medicines down. As a result, more of the drug reaches the bloodstream and stays there longer, which can raise the risk of side effects. For a few drugs the effect runs the other way and makes them work less well.

Medicines that may be affected include some statins for cholesterol, some blood-pressure drugs, some drugs used after organ transplants, some anti-anxiety medicines and some heart-rhythm drugs. Seville oranges, pomelos and tangelos can have a similar effect. If you take any regular medication, ask your pharmacist or doctor before adding grapefruit to your daily drink, or simply leave it out of the recipe and use extra tangerine or a slice of lemon instead.

Common myths about detox and "fat flush" drinks

"It melts belly fat." No food or drink burns fat from a particular area. Fat loss happens across the body when energy use exceeds intake.
"The scale dropped, so it works." Quick drops after a few days of diuretic drinks are usually water, not fat.
"It detoxes your body." Your liver and kidneys clear waste continuously. Drinking enough water supports them, but fruit in the water adds no special detox power.
"Drink it at night for best results." Timing makes no difference to fat loss. Drink it whenever suits you.
"More is better." Very large amounts of water in a short time can be harmful. Spread your drinking through the day and let thirst guide you.

Treat fat flush water for what it is: a refreshing, nearly calorie-free drink that can make hydration more enjoyable. Paired with a balanced diet and regular activity, it can be part of a healthy routine. If you are trying to lose weight for a medical reason, talk to a doctor.

Sources: NPR on Meerman and Brown, The BMJ, 2014: where fat goes; NHS: Water, drinks and your health; US FDA: Grapefruit juice and some drugs don't mix. Recipe originally shared by Collective Evolution.

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