Juice vs Smoothie: What Each One Does With the Fibre

The fibre stays or it goes

One step separates these two drinks and there is no second step worth arguing about. Juicing removes the solid matter and keeps the liquid.

Blending keeps everything and breaks it small enough to pour.

Put the same board of fruit and vegetables in front of a juicer and a blender and you get two glasses that share their ingredients and nothing else. One is a thin liquid you can see through.

The other is a suspension that will hold a spoon upright if the ratio was generous.

Everything below is downstream of that one decision. Yield, waste, texture, sweetness, colour, keeping, equipment and cost all follow from whether the pulp went into the glass or into a bin, and nothing else about either process matters nearly as much.

Neither is a better version of the other. They are two different drinks made from the same shopping, and the choice between them is decided by what is on the board and what is in the cupboard.

How much produce each glass takes

This is where the gap is widest, and it is a matter of arithmetic rather than of taste.

A glass of juice takes a great deal of produce, because most of what goes into a juicer leaves as dry pulp. The detail, including the yields of individual vegetables and what a daily glass costs in shopping, is set out under green juice, which is the hardest case in the category.

A glass of blended drink takes far less, because nothing is thrown away. Two handfuls of leaves and a banana give a full green smoothie, and the same two handfuls would barely register in a juicer.

How far a given quantity of produce goes

FurthestLeast far

1. Blended, with liquid addedEverything reaches the glass, and the liquid extends it further
2. Blended, no added liquidEverything reaches the glass, thick and small in volume
3. Juiced, watery produceCucumber and citrus give up most of their weight as liquid
4. Juiced, firm produceApple and carrot give a fair yield and a wet pulp
5. Juiced, leavesThe worst case by a wide margin, which is why recipes hide it

The shopping list is the honest difference between these two habits, and it is why a blender stays on the counter in more kitchens than a juicer does. Neither machine changes the produce, and only one of them asks you to buy several times as much of it.

Which fruits and vegetables suit each

Not every ingredient can go both ways, and the list of things that refuse one route is longer than most people expect.

Juicing needs something that will give up liquid under pressure. Cucumber, celery, apple, citrus, carrot and pineapple all do, and the drink is built on those whatever else goes in for flavour.

Blending needs nothing of the kind. Banana, avocado, mango and frozen berries carry very little free liquid and behave beautifully in a jug, and a banana in a juicer produces a smear on the auger and almost nothing in the glass.

That asymmetry is worth stating plainly because it decides recipes before anyone has thought about flavour. A smoothie can contain anything a blade will break down, and a juice can only contain what was willing to give up its liquid.

Why one is thin and the other can stand a spoon up

Texture is the difference people notice first, and the two drinks arrive at it by different physics.

Juice is a solution. Sugars, acids and dissolved colour are in the water and the solids have gone, so it pours like water, it sits clear or lightly cloudy, and nothing in it will settle out except a fine sediment.

A smoothie is a suspension. Particles of fruit and leaf are held in the liquid rather than dissolved in it, and how small those particles are is entirely a matter of the blade, the speed and the time.

What the blender is actually doing

1. 1ChopLarge pieces are broken down first, and the jug sounds rough
2. 2SuspendThe mixture starts to circulate rather than jumping around the blade
3. 3RefineParticle size falls, and grittiness gives way to smoothness
4. 4AerateAir is worked in, which lightens the colour and the body
5. 5Over-blendHeat from the motor warms the drink, and it thins and dulls

Under-blending is the commonest fault in a smoothie and it has no equivalent on the other side. Thirty more seconds fixes a gritty glass, whereas nothing added to a juice will thicken it, since the material that would have done so was removed on purpose.

What each glass does to the sweetness

Same fruit, two glasses, and the sweetness reads very differently, which is worth setting out carefully because the reason is arithmetic rather than anything mysterious.

A 250 ml glass of juice holds the liquid of a great deal of fruit. Nothing was discarded except the solids, so the sugars from all of that fruit are concentrated into a small volume, and the drink reads intensely sweet as a result.

A 250 ml smoothie holds far less fruit and usually some added water. The solids take up volume the juice does not carry, so the same glass is built from a fraction of the produce and tastes less concentrated even when it tastes sweeter.

Both drinks can be pushed too sweet and both are usually pushed there by the same two habits: too much fruit and a sweet liquid. Using orange juice as the liquid in a smoothie is the classic version, and topping a vegetable juice with apple until it stops tasting of vegetables is the other.

Water or coconut water leaves the fruit to do the work on its own.

Both go dull, and for different reasons

Neither drink keeps well, and the two mechanisms behind that are different enough to change what you do about it.

Juice separates and browns. The fine sediment drops out within minutes, so the glass wants a stir, and cut fruit surfaces oxidise in the machine, which is why a centrifugal juice dulls faster than a slowly pressed one.

A smoothie goes khaki. Blending drives a lot of air into the mixture, and green pigment fades towards olive within an hour or two, which is cosmetic rather than a sign that anything has gone wrong.

The honest advice is identical on both sides, which makes this one of the axes where neither drink has an advantage. Both are at their best within a few minutes of being made, and both are worth making in the quantity you will actually finish.

The waste runs one way only

Empty a juicer and you are holding most of the shopping. Empty a blender and you are holding a jug that needs rinsing.

Juicing produces a pulp container of dry shredded fibre after every glass, and there is very little to be done with it. It is dry, it has lost most of its flavour to the juice, and the usual suggestions for using it are worth less than the effort of following them.

Blending produces nothing at all.

Every gram bought reaches the glass, which for anyone who has emptied a pulp container every morning is the argument that quietly decides the whole question.

• Juice leaves roughly the majority of the produce weight behind as pulp.
• Smoothies leave nothing, so the shopping and the drink are the same quantity.
• Juicer pulp is dry and largely flavourless, since the flavour went into the glass.
• Composting it is the realistic answer, where that is available.
• A juicer takes several minutes to strip down and wash after each use.
• A blender jug rinses in seconds if it is done before the drink is finished.

Cleaning belongs in the same accounting and it is not a small item. The washing up is part of the recipe on the juice side, and it is the single reason most home juicers end up in a cupboard within a year.

Which machine each one needs

A blender can make both drinks. A juicer can make only one, and that asymmetry decides what to buy far more cleanly than any comparison of models does.

Blend in a jug blender and strain through a cloth and you have juice, made slowly and with a fair yield on soft produce. It is messy and it is limited, and it works, which is why it is the standard advice for anyone unwilling to commit to a second machine.

No juicer will ever make a smoothie. There is no strainer to remove and no setting to change, since the machine is built around separating solids from liquid, and taking the pulp out is the whole of what it does.

The second machine only earns its place if you want juice specifically. Anyone who mostly wants fruit and vegetables in a glass has already bought the right appliance, and the cloth-and-blender route covers the occasional glass of juice well enough to defer the decision indefinitely.

How long each keeps, and what the shop does about it

Both are fresh drinks with short windows, and the commercial versions solve that in ways that change what is in the bottle.

Fresh juice is at its best within twenty minutes and drinkable for a day if it is kept cold and sealed. Shop-bought juice is either pasteurised, which changes the flavour towards cooked, or treated under high pressure, which keeps more of the fresh character and costs more.

Fresh smoothies hold their texture longer than their colour. Separation is slow because the fibre suspends the solids, so a bottle from yesterday looks worse than it tastes, and the reverse is true of juice.

How long each holds up once made

LongestShortest

1. Pasteurised bottled juiceMonths unopened, with a cooked note in exchange
2. Pressure-treated bottled juiceWeeks refrigerated, and closer to fresh
3. Bottled smoothieDays to weeks, depending on the treatment
4. Home smoothie, sealed and coldA day, and khaki by then
5. Home juice, sealed and coldA day at a push, and dull well before that
6. Either, on the counterMinutes at their best

Freezing works on one side and not the other. Frozen fruit blended straight from the bag makes a better smoothie than fresh fruit does, which is the trick behind keeping a smoothie habit going, and frozen and thawed juice separates and tastes flat.

Where the two are the same drink

Several of the things people expect to separate these glasses do not separate them at all, and the pair reads more honestly once those are set aside.

Both are made from fruit and vegetables and both can be built badly. A juice made mostly of apple and a smoothie made mostly of banana are both sweet drinks with a vegetable in them somewhere, whatever the colour suggests.

Both cost more than the produce when bought ready-made, and for the same two reasons: short shelf life and the handling that comes with it.

The sweetener question is a draw as well. A spoon of honey or cane sugar does the same thing in both glasses, as does a knob of ginger, and the fruit was already the sweetener in almost every recipe worth making.

Which to make, and what each is good at

Two questions settle this at the counter, and neither of them is about which drink is better.

Ask what is on the board. If it is bananas, avocado, frozen berries or a bag of leaves, the blender is the only machine that will do anything useful with it.

If it is cucumber, celery, citrus and apple, either route works and they give genuinely different drinks.

Ask second how much shopping and washing up you are willing to do. That question decides more juice habits than flavour ever has, and answering it honestly at the start saves a machine from a cupboard.

Whichever way it goes, the drinks either side of this pair follow the same rule. A berry smoothie and a protein smoothie sit on the blending side with everything kept in, cold-pressed juice and celery juice sit on the other with the pulp discarded, and a smoothie bowl is only a smoothie with less liquid in it.