Mise§1 · Frame
Why structure matters before flavor.
When a beginner tries to describe a wine, they reach for flavor first — “blackberry,” “vanilla,” “leather.” Flavor is what most people notice. But flavor is the unreliable layer. It changes between vintages, between producers, between the second and third sip. Structure does not.
Acidity, tannin, and body are the three structural elements that give a wine its shape. They are measurable with practice. They are the same in a $20 bottle and a $200 bottle made from the same grape — what changes is the quality of their integration. If you can read the structure, you can reason about the wine. If you only read flavor, you are guessing.
§2 · Acidity
Acidity is the spine.
Acidity is what makes your mouth water. You feel it on the sides of the tongue and at the back of the cheeks — a tightening, a salivation response. It is the freshness in a wine, the line that runs through it, the reason a glass of Mosel Riesling can taste light and vibrant even with substantial residual sugar.
Acidity · structural scale
A few quick anchors: warm-climate wines tend toward lower acidity because warm weather lowers acid in ripening grapes. Cool-climate wines preserve more. Sparkling wines almost always carry high acidity — the bubbles amplify the perception, but the acid is real. Sweet wines require acidity to keep them from feeling cloying. If a Sauternes or a late-harvest Riesling tastes balanced rather than syrupy, that is acidity doing its job.
Common mistake
§3 · Tannin
Tannin is the grip.
Tannin is the drying, slightly grippy sensation on the gums, the inside of the cheek, and the front of the tongue. It is a tactile sensation — not a flavor. Tannin comes from grape skins, seeds, and stems, plus oak aging. Red wines have tannin in proportion to how much skin contact they had during fermentation. White wines made without skin contact have effectively none.
Tannin · structural scale
The grape variety sets the ceiling. Cabernet Sauvignon and Nebbioloare inherently high-tannin. Pinot Noir and Gamay are inherently low. Winemaking decisions — how long the wine stays on the skins, whether stems are included, what kind of oak — push the wine within that grape's range. Aging softens tannin: a five-year-old Bordeaux feels less astringent than the same wine at one year old, even though the tannin chemistry has only re-arranged, not disappeared.
§4 · Body
Body is the weight.
Body is how heavy the wine feels in the mouth. It is mostly driven by alcohol — alcohol is viscous, and a 14.5% ABV wine will feel weightier than a 12% one made from the same grape. Glycerol (a fermentation byproduct) and dissolved solids contribute. Residual sugar adds weight too.
Useful comparison: a glass of skim milk versus whole milk versus cream. The flavor is similar. The mouthfeel is not. That is body, doing exactly what it does in wine.
Body · structural scale
Knowledge check · mid-lesson
Formative · not gradedA wine you taste is dry, refreshing, with a strong saliva response that keeps building three seconds after swallowing. There is no astringency on the gums and the wine feels weightless on the mid-palate. Which structural elements are you most likely encountering?
- AHigh acidity, low tannin, light body
- BMedium acidity, medium tannin, full body
- CLow acidity, high tannin, medium body
- DHigh acidity, high tannin, full body
Correct: A. Building saliva three seconds after swallowing is acid. No astringency on the gums means low tannin. Weightless on the mid-palate means light body. The combination — high acid, low tannin, light body — fits wines like Mosel Riesling Kabinett or unoaked Muscadet.
§5 · Interaction
The three elements hold each other up.
Each element changes how the others read. Acidity makes tannin feel more pronounced. Tannin makes body feel firmer. Body softens both. A balanced wine has all three in conversation. An unbalanced wine has one of them shouting over the others — high alcohol with no acid feels flabby; high tannin with no body feels harsh; high acid with no body feels thin.
Three frames worth memorizing:
Champagne
High acid, no tannin, light-to-medium body. The acid does all the work — it carries the wine, holds the dosage in check, and creates the perception of length.
Barolo
High acid, high tannin, medium-to-full body. The tannin and acid lock together. The body has to be there to give them somewhere to live, or the wine reads as punishing.
Napa Cabernet
Medium acid, medium-to-high tannin, full body. The body anchors the structure. Drop the body — same acid and tannin in a thinner wine — and the wine collapses.
Service-floor moment
§6 · Pairing
Why this changes how you pair.
Most pairing logic at the foundation level is structural, not flavor-driven. Acid cuts fat — that is why Champagne works with rich appetizers. Tannin clashes with high heat — that is why a young Cabernet fights with chili and finds its match in steak. Body has to meet body — a delicate fish dish disappears under a full-bodied red, and a heavy braise overwhelms a light white.
These rules will be wrong sometimes. They are useful as a first read. The structural framework gives you defensible reasoning when the obvious match is not on the list.
Exam-relevant