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Science · Tasting

Body and mouthfeel

How coffee feels in the mouth – thickness, oiliness, smoothness, grit and the drying sensation of astringency – what in the cup causes it, how brew method and filter change it, and how cuppers and laboratories measure it.

Across the chain: Science

Source-checkedby Coffearium verification pass· Last source-checked 15 Oct 2026· Prepared with AI assistance· 15 sources (7 tier A)· 2 contested· Updated 20 Oct 2026
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Contents
  • Mouthfeel is touch, not taste or smell. The SCA defines it as the brew’s thickness (viscosity), texture and other tactile properties such as astringency.1
  • The SCA’s Coffee Value Assessment (CVA) widened the older term “body”, which covered weight and texture, to “mouthfeel”, so that astringency and a metallic feel are included.2
  • In a nine-method comparison, the more total solids a brew held, the more body the panel gave it; espressos scored highest and filter coffee among the lowest.9
  • According to a coffee science textbook, paper filters absorb oil very efficiently, while a metal mesh lets fines through and leaves more sediment in the cup.4
  • A 2025 study isolated a phenolic-rich melanoidin fraction from drip coffee that made water and a low-body coffee more astringent – by its authors’ account, the first such evidence.12

What body and mouthfeel are#

Mouthfeel is how a coffee feels in the mouth. The Specialty Coffee Association (SCA) defines it as the tactile perception of the brew while it is in the mouth, leaving out temperature.1 It covers the brew’s thickness (viscosity), its texture, and other tactile properties such as astringency, a mouth-drying sensation.1 Mouthfeel is therefore touch – not taste, which belongs to the taste buds, and not smell.1

“Body” is the older word. According to the SCA, body meant the brew’s weight in the mouth together with its texture.2 The SCA’s 2024 Coffee Value Assessment (CVA) widened it to “mouthfeel” so that astringency and a metallic feel are included as well.2 A cupping textbook chapter describes the same two parts. Weight is the heft on the tongue, and texture the slipperiness, both compared with pure water.5 It places the sensation mainly between the tongue and the roof of the mouth.5

Astringency is usually classed as a feeling, not a taste. A review of wine research traces this view to a 1954 proposal that astringency is a feeling rather than a taste.13 In coffee, the SCA describes mouth-drying as a drying, puckering or tingling sensation on the tongue and in the mouth.1

What in the cup gives body#

A cup of coffee is mostly water, but what is carried in that water is not all dissolved. Four kinds of material contribute to how it feels.

  • Dissolved solids. According to a brewing chapter, stronger coffee at the same extraction yield contains more solids and feels thicker in the mouth.4 In a comparison of nine brew methods, the more total solids a brew held, the higher the panel rated its body.9
  • Colloids. These are large molecules dispersed in the brew. According to a roasting-chemistry chapter, polysaccharides – long chains of sugars from the bean’s cell walls – give the brew viscosity and mouthfeel.6 One 2025 study found that a melanoidin-rich fraction adds astringency.12
  • Suspended particles. Very small coffee particles, called fines, pass some filters and float in the cup. According to the brewing chapter, mouthfeel depends partly on them, particularly in French press and espresso.4
  • Oil droplets. Especially in espresso, coffee oil reaches the cup as tiny droplets spread through the water, an emulsion.7 A cupping chapter describes “brew colloids” in which extracted oils gather around microscopic bean fibres.5
A · What a drop of brew carries1234B · What the filter lets through56

A · What a drop of brew carries

  1. Dissolved solids. Acids, sugars, caffeine and other small molecules. More solids at the same yield means a stronger, thicker-feeling cup.4,9
  2. Colloids. Large molecules such as polysaccharides, linked to viscosity6, and melanoidins, linked to astringency.12
  3. Suspended particles. Fines and microfine bean fibres; felt as grit when there are many, as in cezve coffee.1,4,5
  4. Oil droplets. Coffee oil dispersed as an emulsion, most of all in espresso and pressed coffee.4,7

B · What the filter lets through

  1. Paper filter. Absorbs oil very efficiently, so the brew is low in fat; less sediment reaches the cup than through a metal mesh.4
  2. Metal mesh. A less efficient barrier: fines pass and leave sediment, and pressing squeezes oil into the brew.4
The four kinds of material in brewed coffee that the sources link to body and mouthfeel, and how the filter changes the mix. Schematic; particle and droplet sizes are not drawn to scale.

How brew method and filter change it#

Strength comes first. In a study of nine brew methods, the espressos clearly had the most body. The Karlsbad pot and filter coffee had the least.9 Total solids followed the same pattern: above 4% for the espressos, 1.43% for the French press and 1.03% for filter coffee, measured by oven drying.9 A 2019 study of eight methods measured dissolved solids from 1.35% in French press coffee to 8.44% in a specialty espresso.10 More on brewing principles is in Pour-over and immersion.

0246810% TDSEspresso, specialty (18 g)8.44 ± 0.38%10 Espresso, classic (14 g)5.20 ± 0.35%10 Moka pot3.40 ± 0.15%10 Caffè Firenze (20 bar)3.32 ± 0.40%10 V60 (paper)1.55 ± 0.04%10 Cold brew1.54 ± 0.06%10 AeroPress (paper)1.52 ± 0.06%10 French press (metal mesh)1.35 ± 0.03%10
Data table
% TDSSource
Espresso, specialty (18 g)8.44 ± 0.38%10
Espresso, classic (14 g)5.20 ± 0.35%10
Moka pot3.40 ± 0.15%10
Caffè Firenze (20 bar)3.32 ± 0.40%10
V60 (paper)1.55 ± 0.04%10
Cold brew1.54 ± 0.06%10
AeroPress (paper)1.52 ± 0.06%10
French press (metal mesh)1.35 ± 0.03%10
Total dissolved solids (TDS, refractometer) of eight brews made from the same coffee in one study, mean ± standard deviation. The three espressos and the moka pot were far stronger than the filter and immersion brews, which did not differ significantly from each other.10

The filter decides the rest. According to a brewing chapter, paper absorbs oil very efficiently, so paper-filtered brews are low in fat and are rated rather low in body.4 In a French press, fines and the relatively inefficient metal mesh leave more sediment than a drip filter does. Pressing also squeezes oil from the bed into the brew.4 In the nine-method study, the French press brew carried the most fat per cup. It also had more body than the Karlsbad pot and the filter machine.9

The diterpenes cafestol and kahweol show how much a filter can hold back. In a 2025 study, paper-filtered home brews contained about 12 mg/L cafestol (range 4–24 mg/L), and one French press brew 86.8 mg/L.14 Whether the type of paper matters is not settled. In a 2018 study, micro-perforated papers let the most diterpenes through.15 In the 2025 study, perforated and ordinary papers did not differ significantly.14 Why fines form, and how a pour moves them in the bed, is explained in Particle size and fines and Pour-over technique.

Oil is not the whole story. French press coffee is high in oil. Yet a brewing textbook notes that it is not generally perceived as fuller. The likely reason is that it is drunk as a long, weaker cup.4

Grit. Very small particles feel rough. The SCA names cezve (ibrik) coffee as the example of a rough, gritty, chalky or sandy mouthfeel.1

How cuppers describe mouthfeel#

In the CVA descriptive assessment, the cupper rates the total intensity of mouthfeel on a 15-point scale.1 Intensity here means the amount of body or thickness.2 The cupper then ticks up to two terms from a check-all-that-apply (CATA) list to say what kind of mouthfeel it is.2 The SCA’s list has five terms:1,2

  • Rough (gritty, chalky, sandy) – the feel of very small particles.
  • Oily – the feel of the brew’s oils.
  • Smooth (velvety, silky, syrupy) – a smooth texture.
  • Mouth-drying – the drying, puckering sensation of astringency.
  • Metallic – an aroma and mouthfeel the SCA links with tin cans or aluminium foil.

Each term has a sensory example in the standard, such as alum solution for mouth-drying.1 In the affective assessment, the cupper rates how good the mouthfeel is, not how strong.2 A note such as “lacks body” or “the silky body is its best quality” belongs there.2 How the two assessments fit together is set out in the cupping entry.

The Coffee Taster’s Flavor Wheel is built on the World Coffee Research (WCR) Sensory Lexicon.2 The lexicon has its own mouthfeel group: mouth drying, thickness, metallic and oily.3 It lists body (fullness) separately, in a group of overall attributes it calls amplitude.3 For each attribute it gives references that serve as the standard for that attribute.3 The CVA document notes that the lexicon does not fully cover mouthfeel, which is why the SCA added terms of its own.2 Our flavour wheel shows the CVA descriptor families.

Reference values#

Measured values for body-related properties from the studies opened for this entry. Values come from different coffees, recipes and methods; compare within a row group, not across studies.

Parameter Value Conditions Source
Total solids, French press 1.43 ± 0.01% Oven-dried at 105 °C to constant weight; one coffee, 27.5 g in 500 mL, 240 s Gloess et al.9
Total solids, filter machine 1.03 ± 0.01% Same method; 100 g in 1,800 mL, 348 s Gloess et al.9
Total solids, moka pot 2.13 ± 0.01% Same method Gloess et al.9
Total solids vs rated body r² = 0.69 Nine methods, trained panel Gloess et al.9
Esterified fatty acids Below 0.2% (by weight) in every brew; maximum 0.19 ± 0.03 g per cup in the French press Transesterification, nine methods Gloess et al.9
TDS, specialty espresso / classic espresso 8.44 ± 0.38% / 5.20 ± 0.35% Refractometer; 18 g and 14 g doses, 9 bar Angeloni et al.10
TDS, moka pot / Caffè Firenze 3.40 ± 0.15% / 3.32 ± 0.40% Refractometer; Caffè Firenze is an espresso variant brewed at 20 bar with pressurised air Angeloni et al.10
TDS, V60 / AeroPress / cold brew / French press 1.55 ± 0.04% / 1.52 ± 0.06% / 1.54 ± 0.06% / 1.35 ± 0.03% Refractometer; not significantly different from each other Angeloni et al.10
Viscosity, specialty espresso / classic espresso 151.59 ± 7.01 / 123.13 ± 2.70 Ostwald capillary viscometer at 20 °C; unit as printed, mN·s/m² Angeloni et al.10
Viscosity, moka pot / Caffè Firenze 111.61 ± 2.56 / 115.15 ± 3.29 Same method; not significantly different from each other Angeloni et al.10
Viscosity, V60 / AeroPress / cold brew / French press 99.76 ± 3.44 / 101.74 ± 2.62 / 100.83 ± 2.40 / 98.25 ± 3.97 Same method; not significantly different from each other Angeloni et al.10
Density 1.01–1.07 g/mL; no significant difference between methods Eight methods, 20 °C Angeloni et al.10
Cafestol, paper-filtered / French press ≈12 mg/L (range 4–24) / 86.8 mg/L Home brews of five coffee brands through two kinds of paper filter (10 samples); one French press brew, mean of duplicate analyses; liquid chromatography–mass spectrometry Orrje et al.14
Melanoidin-rich astringent fraction ≈15.7 mg/L in a high-body drip coffee; ≈7.9 mg/L in a low-body one LC-MS/MS standard addition; gravimetric estimate for the low-body coffee Linne et al.12

Notes. Gloess et al. measured oven-dried total solids, Angeloni et al. refractometric dissolved solids; the two are not interchangeable. The viscosity values of Angeloni et al. are given as printed. The paper reports no pure-water reference, so we use them only to compare methods within the study. The same paper lists the French press dose as 15 g in its table and 25 g in its text.10

The physics of thickness#

Strength and viscosity. In the eight-method study, viscosity grouped the brews much as strength did. The espressos were the most viscous, the moka pot and a high-pressure espresso variant came next, and the four filter and immersion brews did not differ significantly from each other.10 Density did not differ between methods.10 The authors note that dissolved solids are known to affect the sensory property called body, citing the nine-method study.10 In that study, total solids explained much of the variation in rated texture and body (r² = 0.69).9 One capsule espresso stood out, scoring higher for body than its total solids would suggest.9

Pressure and temperature. According to a brewing chapter, an earlier study found that raising espresso pressure gave a more viscous brew with more intense body.4 The same chapter notes that hotter water extracts more lipids from the bed, which it links to body and mouthfeel.4 Without heat, fewer low-polarity compounds such as coffee oil are extracted.4

Espresso as a multi-phase liquid. A crema chapter describes espresso as an emulsion of oil droplets, a suspension of solid particles and a foam of gas bubbles, all in one cup.7 The same chapter reports a consumer study that grouped espresso mouthfeel terms into thick, rich, round, lingering, mouth-coating and smooth.7 The chapter suggests that preparations of different concentration need a mouthfeel vocabulary of their own.7

Time in immersion. In a 2024 descriptive study of full immersion brews, astringency and a viscous mouthfeel generally increased with brew time at 4 °C and 22 °C, whatever the roast.11 Brews of 8, 12 and 24 h at both temperatures were significantly more astringent than 4-h brews.11 Across samples, astringency was positively correlated with TDS.11 More on cold brewing is in the cold brew entry.

The chemistry: polysaccharides, melanoidins and phenolics#

Polysaccharides. Cell-wall polysaccharides do not seem to contribute to aroma, but according to a roasting-chemistry chapter they give the brew viscosity and mouthfeel.6 Roasting breaks down part of them, mainly the side chains of the arabinogalactans; cellulose and mannans stay largely intact.6 No study opened for this entry measured how much of the viscosity of brewed coffee is due to polysaccharides.

Melanoidins and astringency. A 2025 study traced astringency in a high-body drip coffee by splitting the brew into fractions and tasting each.12 The astringency sat in the fraction below 5 kDa; the larger molecules tasted like water.12 After three rounds of separation, the strongest signals in the final fraction came from condensed polyphenolic compounds, and its light absorbance pointed to melanoidins.12 Added to water, or to a low-body coffee to match the high-body one, it was perceived as drying or astringent.12 Some of its molecules matched products of roasted chlorogenic acids in a model system.12

Chlorogenic acids and over-extraction. A brewing chapter counts chlorogenic acid lactones among the bitter or astringent compounds that dissolve only after the early, easily soluble acids and sugars.4 As extraction continues, the profile moves from sweet and acidic towards bitter, harsh and astringent.4 Green coffee itself is described as tasting sweet and astringent.6 The chemistry of these acids is covered in Acids in coffee.

How astringency works. Research on wine gives the mechanism most often discussed. Phenolic compounds bind with proteins, including those in saliva.13 Some researchers argue that the resulting loss of lubrication drives the drying sensation; others found evidence against this link, and the review calls the mechanism undefined.13 The coffee study tested perception, not this mechanism, for its melanoidin fraction.12

Roast. A roasting chapter describes body as rising with roast degree to a point and then falling, so that over-roasted coffee may taste thin.8 For a study that rated body across roast colours, see Carbohydrates and body; how the timing of roast phases relates to body is discussed in the Maillard reaction entry.

Measuring mouthfeel#

Sensory panels. Trained panels rate mouthfeel attributes against references. The WCR lexicon gives a reference for each attribute, including thickness, oily and mouth drying.3 The 2024 immersion study used “astringent” and “viscous” as its mouthfeel attributes.11 In the CVA, the descriptive form records intensity and CATA terms, and the affective form a separate judgement of quality.1,2

Instruments. Total solids can be measured by drying a weighed sample to constant weight9 or, as dissolved solids, with a refractometer.10 Viscosity was measured with an Ostwald-type capillary viscometer at 20 °C in one study.10 Lipids were measured as esterified fatty acids after transesterification.9 No peer-reviewed measurement of turbidity in brewed coffee, by filter type, was opened for this entry; figures that circulate for it are left out.

Practical comparison. You can compare filters by brewing the same coffee, dose and water through paper and through a metal mesh, then tasting both side by side for thickness and grit. Keep the strength the same, for example by checking both with a refractometer, because stronger coffee feels thicker on its own.4,9

Open questions#

  • Oil versus strength. No study opened for this entry varied oil content while keeping strength constant. Whether oil itself adds body in filter-strength coffee is therefore not established.4,9
  • Turbidity and fines. The textbook link between fines and mouthfeel4 lacks a peer-reviewed measurement of suspended particles by filter type among the sources opened here.
  • Polysaccharides. Their contribution to the viscosity of brewed coffee is stated in a textbook6 but was not quantified in any study opened for this entry.
  • Astringency compounds. The melanoidin fraction was shown to add astringency; whether it acts through salivary proteins, as wine phenolics are thought to, was not tested.12,13
  • Shared vocabulary. The CVA added mouthfeel terms because the lexicon does not fully cover them.2 How consistently cuppers use these new terms has not been tested in a study opened here.

Key studies#

Gloess et al., 2013 – Nine methods side by side. One coffee was brewed by nine methods, from espresso to filter machine, and analysed for total solids, fatty acids, aroma and sensory profile. Rated body rose with total solids; espressos had the most body, the Karlsbad pot and filter coffee the least, and the French press the most fat per cup.

European Food Research and Technology 236, 607–627 · doi:10.1007/s00217-013-1917-x

Angeloni et al., 2019 – Eight methods, viscosity and strength. Eight brew methods were compared for dissolved solids, density, pH, viscosity and chemical composition. Espressos were the strongest and most viscous; V60, AeroPress, cold brew and French press did not differ significantly in viscosity.

Food Research International, 1327–1335 · doi:10.1016/j.foodres.2018.10.022

Linne et al., 2025 – Melanoidins and astringency. A high-body drip coffee was separated step by step, and each fraction was tasted against the coffee. A polyphenol-rich melanoidin fraction made water and a low-body coffee perceptibly more astringent; the authors present this as the first evidence that melanoidins contribute to coffee’s tactile profile.

Food & Function 16, 2870–2880 · doi:10.1039/d4fo04934a

Liang et al., 2024 – Immersion brews over time. A trained panel profiled full immersion brews made at 4, 22 and 92 °C and sampled over time. At the two cooler temperatures, astringency and viscous mouthfeel generally increased with brew time, and astringency rose with dissolved solids.

Scientific Reports 14, 19298 · doi:10.1038/s41598-024-69867-6

Contested
  • Oil and body. A coffee science textbook calls the role of extracted oil in body “not fully clear”: French press coffee is high in oil yet is not generally perceived as fuller, probably because it is drunk as a long, weaker cup4. In a nine-method comparison, the French press had the most esterified fatty acids per cup and more body than the Karlsbad pot and the filter machine – but it also held more total solids.9 Oil and strength have not been separated in the studies opened for this entry.
  • Perforated paper filters and diterpenes. In a 2018 study, paper filters with micro-perforations gave the highest cafestol and kahweol concentrations among the papers tested.15 In a 2025 study, perforated “aroma” filters averaged 13.2 mg/L cafestol against 9.7 mg/L for ordinary filters, a difference that was not significant.14
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Sources

  1. A/BSpecialty Coffee Association (2024). SCA Standard 103-2024 Coffee Value Assessment: Descriptive Assessment. Specialty Coffee Association.
  2. A/BSpecialty Coffee Association (writing team Fernández-Alduenda, M.; Ionescu, K. E.; Giuliano, P.; Rugolo, J.; Delrue, R.) (2024). A System to Assess Coffee Value: Understanding the Specialty Coffee Association’s Coffee Value Assessment (June 2024). Specialty Coffee Association.
  3. BWorld Coffee Research (2017). World Coffee Research Sensory Lexicon: Unabridged Definition and References, Version 2.0. World Coffee Research.
  4. BMestdagh, F.; Glabasnia, A.; Giuliano, P. (2017). The Brew – Extracting for Excellence. In: Folmer, B. (ed.), The Craft and Science of Coffee, Academic Press, ch. 15, pp. 355–380. doi:10.1016/B978-0-12-803520-7.00015-3 · other copies
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  7. BFolmer, B.; Blank, I.; Hofmann, T. (2017). Crema – Formation, Stabilization, and Sensation. In: Folmer, B. (ed.), The Craft and Science of Coffee, Academic Press, ch. 17, pp. 399–417. doi:10.1016/B978-0-12-803520-7.00017-7 · other copies
  8. BSchenker, S.; Rothgeb, T. (2017). The Roast – Creating the Beans' Signature. In: Folmer, B. (ed.), The Craft and Science of Coffee, Academic Press, ch. 11, pp. 245–271. doi:10.1016/B978-0-12-803520-7.00011-6 · other copies
  9. AGloess, A. N.; Schönbächler, B.; Klopprogge, B.; D’Ambrosio, L.; Chatelain, K.; Bongartz, A.; Strittmatter, A.; Rast, M.; Yeretzian, C. (2013). Comparison of nine common coffee extraction methods: instrumental and sensory analysis. European Food Research and Technology 236, 607–627. doi:10.1007/s00217-013-1917-x · other copies
  10. AAngeloni, G.; Guerrini, L.; Masella, P.; Bellumori, M.; Daluiso, S.; Parenti, A.; Innocenti, M. (2019). What kind of coffee do you drink? An investigation on effects of eight different extraction methods. Food Research International, pp. 1327–1335 (volume not confirmed in the copies opened). doi:10.1016/j.foodres.2018.10.022 · other copies
  11. ALiang, J.; Batali, M. E.; Routt, C.; Ristenpart, W. D.; Guinard, J.-X. (2024). Sensory analysis of the flavor profile of full immersion hot, room temperature, and cold brewed coffee over time. Scientific Reports 14, 19298. doi:10.1038/s41598-024-69867-6 · other copies
  12. ALinne, B. M.; Tello, E.; Simons, C. T.; Peterson, D. G. (2025). Chemical characterization and sensory evaluation of a phenolic-rich melanoidin isolate contributing to coffee astringency. Food & Function 16(7), 2870–2880 (Royal Society of Chemistry). doi:10.1039/d4fo04934a · other copies
  13. AKuhlman, B. A.; Aleixandre-Tudo, J. L.; Moore, J. P.; du Toit, W. (2024). Astringency Perception in a Red Wine Context – A Review. OENO One 58(1). doi:10.20870/oeno-one.2024.58.1.7774 · other copies
  14. AOrrje, E.; Fristedt, R.; Rosqvist, F.; Landberg, R.; Iggman, D. (2025). Cafestol and kahweol concentrations in workplace machine coffee compared with conventional brewing methods. Nutrition, Metabolism and Cardiovascular Diseases 35, 103933. doi:10.1016/j.numecd.2025.103933 · other copies
  15. ARendón, M. Y.; dos Santos Scholz, M. B.; Bragagnolo, N. (2018). Physical characteristics of the paper filter and low cafestol content filter coffee brews. Food Research International 108, 280–285. doi:10.1016/j.foodres.2018.03.041 · other copies

Tier A · authoritative · B · trade and expert · C · general. Supporting quotes for every source are in the data version of this entry. If a publisher’s site refuses access, try the doi link or “other copies”.

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