Topics Food and drink

How is wine made?

Wine is made by letting yeast eat the sugar in grape juice. The yeast turns that sugar into alcohol and carbon dioxide, and the result, after some clearing, aging and bottling, is wine. Grapes are harvested, crushed, fermented, separated from their skins and seeds, settled, and then aged in tanks, barrels or bottles.

What makes it interesting is how much changes from small choices. Red wine gets its color and tannins because the juice ferments with the grape skins. White wine is usually fermented after the skins are removed. Rosé sits in between. Sparkling wine gets its bubbles from a second fermentation that traps the gas. Temperature, grape variety, the yeast used and the type of container all shape the taste. Some of what makes a wine from one place taste different from another is well understood, and some is still debated.

An episode on bre, whose hosts are AI and can be wrong, would walk through the year from vineyard to bottle, explain the chemistry in plain language, and leave room for you to press Talk and ask what you are curious about, like why some wines are sweet and others dry.

What a bre episode would cover

An outline of the episode bre would make for this question. Every episode is written fresh when you ask, so yours will differ.

  1. From vine to harvestGrapes ripen as sugar builds and acid falls. Picking time is a balance between those two, and growers weigh it carefully.
  2. Crushing and pressingThe grapes are broken open to release juice. Whether the skins stay in contact with it is the first big fork in the road.
  3. What yeast actually doesYeast consumes sugar and produces alcohol and carbon dioxide. Some winemakers add a chosen yeast, others rely on yeast already present.
  4. Why red, white and rosé differColor and tannin come from the skins, so time spent with them changes the wine. Rosé gets only a short stay.
  5. Dry, sweet and sparklingStopping fermentation early leaves sugar behind, while a second fermentation in a sealed container creates bubbles.
  6. Aging and bottlingWine is settled, clarified and often rested in barrels or tanks. Oak can add flavor, and not every wine is meant to age.
  7. How much is terroir?Soil, climate and place clearly matter, but how much and why is argued over. The episode says where the evidence is thin.

How the episode might open

A sample exchange between two of bre’s AI hosts, bre and Arlo. Both are AI; this is written by AI, as every bre episode is.

  1. breAI host

    Okay, picture a bunch of grapes sitting in a crate at the end of summer. Nobody has done anything clever yet. So where does the wine come from?

  2. ArloAI host

    Yeast. Sugar in, alcohol out.

  3. breAI host

    Right, but that sounds almost too simple. Grape juice left alone doesn't politely turn into something you'd pour for dinner.

  4. ArloAI host

    Mostly turns into vinegar. Or a mess.

  5. breAI host

    Fair. So the winemaker's job is less making wine and more steering what the yeast does. Controlling temperature, air, timing.

  6. ArloAI host

    Steering, not making. Got it.

  7. breAI host

    And the first big decision is whether the skins stay in the juice. That one choice splits red from white. Do you want to start there?

  8. ArloAI host

    Yeah. Who decided skins matter that much?

Questions people also ask

What are the basic steps of making wine?
Grapes are harvested and crushed, then fermented by yeast so the sugar becomes alcohol. The wine is separated from skins and seeds, clarified, aged in tanks, barrels or bottles, and finally bottled. Details vary a lot by style and winemaker.
What is the difference between red and white wine production?
Red wine ferments with the grape skins, which give it color and tannins. White wine is usually pressed first so the juice ferments without skins. Grape variety matters too, and rosé comes from brief skin contact.
How long does it take to make wine?
It varies widely. Fermentation often takes days to a few weeks, but aging can add months or years. Some light wines are bottled within months of harvest, while others rest much longer before release.
Is wine made only from grapes?
Most wine is made from grapes, and the word usually means that. Fermented drinks made from other fruits, such as apples or plums, are sometimes called fruit wines, and rice wine is made differently, from starch.

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bre’s hosts are AI, and every episode is generated, so they can be wrong: check anything that matters. This page outlines what an episode would cover. It is for interest and learning, not medical, financial or legal advice.