Alcohol as a Structural Element

Alcohol is detected mainly through the sense of touch. Alcohol is less dense than water but more viscous, so higher alcohol tends to make a wine seem heavier in the mouth. Low alcohol can make a wine seem watery, although grape extract and sweetness can compensate. Alcohol also contributes warmth and weight and can enhance the perception of sweetness, while glycerol, also produced during fermentation, may add slightly to texture and fullness.

• Warmth: wines with higher levels of alcohol may feel warm on the palate
• Weight: for most wines, alcohol is the main factor contributing to body; sugar and grape extract add to body, while high acidity makes a wine feel lighter
• Sweetness: alcohol and glycerol can add a perception of sweetness, even though sweetness is mainly the taste of sugar
• Serving temperature: warmer temperatures highlight alcohol and body, and serving a red slightly chilled can reduce the prominence of alcohol

At high levels alcohol can trigger pain receptors, giving a hot, burning sensation, especially after spitting or swallowing. That burn can be confused with the tingling sensation caused by acidity. To tell them apart, ask whether the wine is also mouth-watering, which points to acidity, or feels thick and viscous, which points to alcohol; a wine may be high in both. The glass offers a clue as well. All wines show legs or tears, the streams of liquid that cling to the glass after swirling, and wines that contain sugar or high alcohol are more viscous, with thicker, more persistent tears. These appearance observations are rarely conclusive, and the WSET examinations award no marks for them.

• A hot, burning sensation after spitting or swallowing suggests high alcohol
• Mouth-watering points to acidity; thick and viscous points to alcohol
• Thicker, more persistent tears suggest sugar or high alcohol, but appearance clues are rarely conclusive
• At WSET Level 3, alcohol is judged on a three-level scale, so writing medium(+) or medium(-) for alcohol is a common exam mistake

Most wines have alcohol levels of around 8% to 15% abv, and fortified wines, where additional alcohol has been added, can range from 15% to 22% abv. The WSET Diploma tasting scale maps these numbers onto levels: below 11% abv is low, 11% to 13.9% abv is medium, and 14% abv or above is high, with the medium band split into medium(-), medium, and medium(+) one percentage point at a time. Fortified wines use their own scale, starting at 15% abv, with the medium level at 17% to 19% abv. The OIV sets a minimum actual alcohol content of 8.5% vol for wine, which regional legislation may reduce to 7% vol, and defines liqueur wine at 15% to 22%, with a state allowed up to 24% for its domestic market. On US labels, a wine at 14 percent alcohol by volume or less may carry a stated figure with a tolerance of 1.5 percent above or below, and a wine above 14 percent a tolerance of 1 percent, so the actual content may differ from the stated figure within those limits.

• Low: below 11% abv
• Medium(-): 11% to 11.9% abv; medium: 12% to 12.9% abv; medium(+): 13% to 13.9% abv
• High: 14% abv or above
• Fortified wines: alcohol starts at 15% abv, with medium at 17% to 19% abv
• A southern Rhône red with quite high alcohol and full body sits at the opposite end from a classic Vinho Verde with low alcohol and high acidity

A wine with full body and warming high alcohol can still be balanced when the high tannins, full body, and concentration support the alcohol, which is integrated despite being high. The opposite case is a wine where the alcohol dominates, resulting in a hot, burning finish, a negative attribute in a quality assessment. In the WSET examinations, balance must be explained with reference to the structural components, and words such as warming or spirity can describe alcohol at the extremes. For the causes of excess alcohol and how winemakers manage it, see the dedicated Hot / Alcoholic Wine article; for how alcohol fits alongside sweetness, acidity, tannin, body, and finish, see Wine Structure.

• Integrated: high alcohol supported by tannin, body, and concentration
• Dominant: alcohol overwhelms the wine and leaves a hot, burning finish
• Descriptive words such as warming or spirity can help explain alcohol when judging quality

Every figure and definition in this article is drawn from the primary sources below. Last verified 2026-10-05.

• https://www.wsetglobal.com/media/3119/wset_l3_wines_sat_en_jun-2016.pdf
• https://www.wsetglobal.com/media/6714/wset_l4diploma_cag_tasting_en_aug2018.pdf
• https://www.wsetglobal.com/knowledge-centre/blog/2026/the-secret-language-of-wine-what-is-mouthfeel
• https://www.wsetglobal.com/knowledge-centre/blog/2021/december/14/what-is-wine
• https://www.wsetglobal.com/knowledge-centre/blog/2022/september/27/busting-wine-industry-jargon
• https://www.wsetglobal.com/knowledge-centre/blog/2024/how-to-ace-the-wset-level-3-award-in-wines-tasting-exam
• https://www.oiv.int/standards/international-code-of-oenological-practices/part-i-definitions/wines/basic-definition
• https://www.oiv.int/standards/international-code-of-oenological-practices/part-i-definitions/special-wines
• https://www.ecfr.gov/current/title-27/chapter-I/subchapter-A/part-4/subpart-D/section-4.36