Why Does Coffee Taste Bitter? Chemistry, Brewing, and the Psychology of Bitterness
Author: Ukrainian Psychological Hub · Published: September 28, 2026 · Editorial Policy
Coffee tastes bitter because roasted coffee contains a mixture of bitter-tasting compounds, and brewing determines how strongly those compounds are expressed in the cup. Caffeine contributes bitterness, but it is only one part of the chemistry. Chlorogenic-acid derivatives formed during roasting, including chlorogenic acid lactones, and strongly roasted compounds such as phenylindane-type products also contribute. Controlled sensory research shows that roast level, brew strength and extraction yield interact, so the familiar rule “bitter coffee means over-extraction” is useful only as a troubleshooting clue, not as a complete explanation. A 2020 trained-panel study found that bitterness changed systematically with both total dissolved solids and extraction yield across light, medium and dark roasts.
If your coffee tastes unpleasantly bitter, the most useful first question is not simply “Did I extract too much?” Ask what kind of sensation you mean. True bitterness is a taste. Sourness is an acid-related taste. Astringency is a drying or rough tactile sensation. Burnt, smoky and ashy are flavor or aroma qualities. A very concentrated cup can also feel “strong” without containing unusually high total caffeine. Separating these experiences makes brewing corrections far more reliable.
For a quick practical fix, change one variable at a time. If a filter brew is bitter, drying and running much slower than usual, try a slightly coarser grind. If it is simply too intense, dilute a small portion with hot water before changing the recipe; if dilution improves it, concentration was part of the problem. If the bitterness is smoky or ashy in every brew, the roast profile may be the dominant cause. If the cup is both sour and bitter, suspect uneven extraction rather than assuming that the entire brew is uniformly over-extracted.
Is coffee supposed to taste bitter?
Yes. Some bitterness is a normal part of coffee. Coffee is not a neutral liquid that becomes bitter only when something goes wrong. Roasting creates and transforms many compounds that contribute bitterness, while caffeine is itself a bitter molecule. The practical distinction is between bitterness as one component of a balanced flavor profile and bitterness that dominates sweetness, acidity, aroma and mouthfeel.
Professional sensory evaluation treats coffee as a multidimensional sensory object rather than reducing quality to one taste. The Specialty Coffee Association’s current Coffee Value Assessment separates descriptive assessment from affective judgment and records characteristics such as aroma, flavor, aftertaste, acidity, sweetness and mouthfeel. That framework matters because intensity and liking are different questions: two people can agree that a coffee is intensely bitter and still disagree about whether they enjoy it.
This also explains why “good coffee should never be bitter” is too absolute. A pleasant bitter edge can add structure, much as bitterness does in dark chocolate or some beers. What usually signals a problem is harshness, a persistent mouth-drying finish, overwhelming roast character, or a level of bitterness that suppresses the rest of the cup.
What bitterness actually is — and what it is often confused with
Bitterness
Bitterness is a gustatory sensation detected through bitter-taste receptor pathways. In coffee it comes from multiple compounds rather than a single chemical switch. Because those compounds differ in concentration, sensory threshold and interactions with the coffee matrix, perceived bitterness does not map cleanly onto one laboratory number such as caffeine concentration.
Sourness and acidity
Sourness is not the opposite end of one simple bitter-to-sour scale. Organic acids, roast chemistry and extraction all influence acidity-related sensations. A brew can be sour and bitter at the same time, especially when extraction is uneven. Calling every sharp taste “sour” and every unpleasant finish “bitter” makes troubleshooting harder.
Astringency
Astringency is primarily a tactile, mouth-drying or rough sensation rather than a basic taste. Coffee drinkers often label it “bitter” because the experiences can occur together. The SCA’s newer sensory framework explicitly places mouth-drying sensations within mouthfeel. That distinction is useful at home: a drying finish points you toward extraction uniformity, fines, roast and water interactions rather than treating the experience as pure bitterness alone.
Burnt, smoky and ashy flavor
Burnt, smoky and ashy notes are not synonyms for bitterness. They arise largely from aroma and flavor chemistry associated with stronger roasting and, in some cases, stale residues or contaminated brewing equipment. A dark roast can therefore taste “more bitter” partly because roast-associated aroma, bitterness and astringency reinforce one another perceptually.
The chemistry: what makes roasted coffee bitter?
The chemistry of coffee bitterness is layered. Green coffee contains chlorogenic acids and caffeine among many other compounds. Roasting transforms the bean through dehydration, Maillard reactions, thermal degradation and structural change. Some precursor molecules decline, others are formed, and the balance of volatile and nonvolatile compounds shifts with roast degree. A review of coffee extraction emphasizes that the cup ultimately reflects both roast-generated chemistry and the selective transfer of compounds during brewing.
Chlorogenic acid lactones
Chlorogenic acid lactones are among the best-established contributors to coffee bitterness. They form during roasting from chlorogenic-acid precursors. Their abundance does not simply rise forever as roast gets darker; formation and degradation follow roast-dependent trajectories. Work on roast chemistry identified several chlorogenic acid lactones and showed that their levels change systematically during roasting.
Their sensory role has also been tested directly. Selective enzymatic hydrolysis of chlorogenic acid lactones in coffee extract reduced bitterness, supporting a causal contribution of these compounds rather than a mere correlation with roast level.
Phenylindanes and strongly roasted bitter compounds
As roasting progresses, additional bitter compounds can emerge from thermal reactions. Sensory-guided chemical work identified multiply hydroxylated phenylindanes and related 4-vinylcatechol oligomers in roasted coffee, with low recognition thresholds and a bitterness reminiscent of strongly roasted espresso-style coffee. These compounds were verified in brewed coffee by LC-MS/MS, giving a chemical basis for the pronounced bitterness associated with some darker roasts.
Caffeine is bitter, but caffeine is not the whole explanation
Caffeine is intrinsically bitter, so it belongs in any account of coffee bitterness. The mistake is to assume that more bitter coffee must contain more caffeine, or that caffeine concentration alone determines how bitter a cup tastes. Coffee is a complex matrix in which other bitter compounds and interactions matter.
Recent evidence makes that point especially clearly. A 2026 sensory and NMR study found that interactions between caffeine, chlorogenic acid and coffee melanoidins reduced the perceived bitter intensity of caffeine substantially compared with an aqueous caffeine reference at comparable concentration. The result does not make caffeine non-bitter; it shows that bitterness in a real coffee matrix cannot be predicted from caffeine concentration alone.
A separate 2025 Food Chemistry study comparing roasted and brewed Arabica samples likewise reported that roast process explained bitter attributes more strongly than caffeine content in its experimental system. Its chemometric correlation between measured caffeine and bitterness was near zero, reinforcing the point that roast and matrix effects can dominate the sensory experience.
How roast level changes bitterness
Roast degree changes both the chemistry and the sensory profile of coffee. Lighter roasts tend to preserve more origin-linked acidity, fruit and floral expression; darker roasting increasingly emphasizes roasted, dark-chocolate, smoky, burnt and bitter dimensions. This is a broad tendency, not a rule that every dark roast is unpleasantly bitter or every light roast is low in bitterness.
Controlled drip-brewing experiments make the interaction visible. Frost and colleagues varied roast level, brew strength and percent extraction and found significant response surfaces for bitterness, sourness, sweetness, burnt wood/ash, thickness and flavor persistence. The same brewing coordinates did not produce one universal sensory outcome independent of roast.
For the broader roast-level framework — including what light, medium and dark roast mean, how roast affects density, solubility, acidity, aroma and caffeine interpretation — see Coffee Roast Levels: Light, Medium, Dark, and How Roast Changes Flavor. For a deeper treatment of the particular sensory logic of dark roast, see Dark Roast Coffee: Taste, Caffeine, Bitterness, and the Psychology of Strong Coffee.
Does bitter coffee mean it was over-extracted?
Sometimes, but bitterness by itself does not prove over-extraction. “Extraction” is the transfer of soluble material from ground coffee into water. “Strength” is how concentrated the dissolved material is in the beverage. Those variables are related through the brew recipe, yet they are not identical. A cup can be highly concentrated without an unusually high extraction yield, and a more dilute cup can reach a high extraction yield.
This distinction matters because classic brewing advice often treats a single region of the brewing chart as “bitter” and another as “ideal.” Modern sensory work shows a richer pattern. In a 2023 synthesis of trained-panel and consumer data, high brew strength combined with high percent extraction was associated with stronger bitterness, astringency and roasted notes, while other regions expressed different combinations such as acid/sour and citrus.
So “over-extraction causes bitterness” is directionally useful in many real brewing situations, especially when a brew is simultaneously harsh, drying and extracted more strongly than intended. It becomes misleading when used as a universal diagnosis. Roast chemistry, brew strength, uneven extraction, grinder particle distribution, water and individual perception can all produce a bitter experience without a single simple mechanism.
Grind size: why too fine can taste bitter — and why it is not automatic
Grinding changes particle size, surface area, permeability and the path water takes through the coffee bed. In drip and pour-over brewing, a finer grind commonly increases extraction rate and can also slow flow. If your brew time has lengthened and the cup has become bitter and drying, moving slightly coarser is one of the most practical first tests.
Yet “finer equals bitter” is too simple. A grinder produces a distribution of particle sizes, including fines. In percolation methods, very fine particles can alter resistance and flow; in espresso, puck preparation and channeling can create locally over-extracted and under-extracted regions at the same time. The cup can therefore taste both sharp and bitter. The coffee-extraction literature treats particle size together with pressure, contact time, water quality, temperature and coffee-to-water ratio because these variables interact rather than operating independently.
Brew time and flow: longer is not automatically worse
More contact time generally creates more opportunity for extraction, but the sensory effect depends on the brewing method and on how rapidly mass transfer is still occurring. A French press is designed around several minutes of immersion; espresso is designed around a short pressurized extraction; cold brew may run for hours. Comparing those clock times directly tells you little.
Use time as a diagnostic relative to your own method and recipe. If a pour-over that normally drains cleanly becomes much slower after a grind change and bitterness rises, the flow change is informative. If an immersion brew tastes fine at a longer steep, the clock alone is not evidence of a brewing fault. Consistency within the method is more useful than a universal time cutoff.
Water temperature: hot water changes extraction, but it does not simply “burn” the grounds
Higher water temperature generally accelerates extraction kinetics and changes volatility, which is why temperature is a powerful brewing lever. But the common claim that near-boiling water automatically “scorches” already-roasted coffee grounds is a poor explanation. Water temperature affects how quickly and how much material is transferred; it is not re-roasting the beans.
A controlled Scientific Reports experiment separated temperature from brew strength and extraction. Researchers brewed at 87, 90 and 93°C while adjusting grind and flow so that total dissolved solids and extraction yield were held at target values. Once those variables were matched, brew temperature had little appreciable effect on the trained-panel sensory profile across that temperature range.
The practical lesson is precise: lowering temperature can reduce bitterness in a real recipe because it can reduce or slow extraction when other variables remain unchanged, and it can be particularly useful with highly soluble dark roasts. Temperature is therefore a useful control, but “too hot equals bitter” is not an independent law.
Coffee-to-water ratio and brew strength: when “bitter” really means “too concentrated”
Drinkers often use “bitter,” “strong” and “intense” interchangeably. That can hide an easy fix. If the beverage contains a high concentration of dissolved coffee solids, many sensory attributes become more intense and the cup may feel heavy, persistent or harsh even when its extraction yield is not extreme.
To test whether concentration is the problem, take a small portion of the finished coffee and add a measured amount of hot water. If the flavor becomes clearer and the objectionable bitterness falls while the underlying flavor remains pleasant, the brew may simply be stronger than you prefer. This is especially useful because it changes concentration after brewing without altering what was extracted from the grounds.
Water composition and equipment cleanliness can change the result
Brewing water is the solvent, so mineral composition affects extraction and sensory expression. The effect is more complicated than “hard water is bitter” or “soft water is better.” Different dissolved ions interact with acids and other compounds, and water chemistry can alter extraction behavior. A major review identifies water quality as one of the core parameters, alongside temperature, particle size, pressure, time and brew ratio, that influences coffee chemistry and flavor.
Equipment cleanliness is simpler. Old coffee oils and residues oxidize and accumulate on grinders, brewers, carafes, portafilters and screens. If bitterness or rancid harshness appears suddenly across several coffees, cleaning the equipment is a low-cost diagnostic before changing the beans or rebuilding the entire recipe.
Why uneven extraction can taste both sour and bitter
A coffee bed does not always extract uniformly. Water can preferentially follow channels, while fines, clumps or poorly wetted regions create different local extraction conditions. One part of the dose can contribute sharp, underdeveloped sensations while another contributes bitter, drying or heavily extracted sensations. The final cup is the mixture.
This is why a cup that is simultaneously sour and bitter is not a contradiction. In pour-over, look for uneven pouring, bed collapse, clogging or an unexpectedly broad grind distribution. In espresso, puck preparation, channeling and grind distribution deserve attention. The goal is not merely to lower or raise “extraction” in the abstract but to make extraction more even.
How to make coffee less bitter: a practical troubleshooting sequence
1. Name the sensation before you change the recipe
Taste again when the coffee is warm rather than scalding. Ask whether the dominant problem is true bitterness, sourness, a drying astringent finish, burnt or smoky aroma, or simple concentration. This single step prevents you from correcting the wrong variable.
2. Test dilution
Dilute a small sample with hot water. If the coffee becomes pleasant, concentration was contributing. You can then adjust the coffee-to-water ratio or beverage yield in the next brew without immediately changing grind, roast or temperature.
3. If the brew is slow and drying, move slightly coarser
A small grind change is more informative than a dramatic jump. Keep dose, water and technique stable. If flow improves and bitterness falls without turning the cup thin or sour, the previous setting was likely extracting too aggressively for that coffee and method.
4. Control time and flow rather than chasing a universal stopwatch number
Compare the brew with your own successful baseline. Shorten excessive contact or correct unusually slow percolation, but remember that immersion, espresso, drip and cold brew have different extraction dynamics. A method-specific baseline is more useful than one time target for every brewer.
5. Use temperature as a controlled lever
If a dark or highly soluble roast remains harsh, lower brew temperature modestly while keeping the rest of the recipe stable. If the coffee then becomes dull or sour, move back upward or change grind instead. Temperature works through extraction dynamics; use it experimentally, not as a superstition.
6. Check the roast
If every recipe produces smoky, charred, ashy or persistent roast bitterness, the bean may simply be roasted darker than you enjoy. Brewing can change expression, but it cannot restore delicate origin character that was transformed by a very dark roast. Choosing a medium or lighter roast may solve the sensory problem more directly.
7. Clean the brewing path and retest with known water
Clean the grinder chute, brewer, carafe and any surfaces that contact coffee oils. If water quality is uncertain, make one controlled brew with a reliable brewing water or clean filtered water. The point is diagnosis: change one factor, taste, and keep the change only if it improves the cup.
Method-specific clues
Pour-over and drip coffee
When pour-over or drip coffee becomes bitter and the brew is running slowly, grind size and bed resistance are good first suspects. Coarsen slightly and keep the rest of the technique stable. If the brew time is normal but the cup is simply intense, test dilution before changing extraction. If bitterness is roast-driven, recipe changes will have limited power.
French press and other immersion methods
Immersion extraction behaves differently from percolation because water and grounds remain together. A longer steep does not automatically produce catastrophic over-extraction. If the cup is muddy, drying or harsh, grind distribution, fines, roast and serving technique may matter as much as an extra minute on the clock. Decanting after brewing can also reduce continued contact and sediment in the cup.
Espresso
Espresso magnifies concentration, flow and puck-uniformity effects. A slow shot with a fine grind can taste bitter and drying, but a channeled shot can combine bitter and sour sensations. Change one variable at a time, and distinguish shot concentration from total caffeine per serving. Espresso’s intense flavor does not automatically mean that it contains more total caffeine than every larger brewed coffee.
Cold brew
Cold brew uses low temperature and long contact time, so its extraction path differs from hot brewing. It can still taste bitter, especially with dark roasts, very strong concentrate, excessive fines or a recipe that emphasizes roast-derived bitterness. Dilution is especially informative when tasting concentrate because concentration itself can dominate the experience.
Why bitterness feels different from person to person
The same coffee does not produce an identical experience in every mouth. Taste sensitivity varies, as do learned preferences, prior exposure, expectations and the way aroma and mouthfeel are integrated with taste. These differences are real without implying that one person is tasting “correctly” and another is not.
Laboratory work with PROP taste sensitivity illustrates part of this variability. In one coffee study, PROP supertasters rated sourness, bitterness and astringency more strongly than non-tasters, although coffee liking did not reduce to PROP status in a simple way. The study also found differences in sugar use, showing why sensory sensitivity and preference should be treated as related but distinct variables.
Genetic studies add another layer but do not justify personality-style claims about coffee drinkers. A large analysis of coffee and other bitter foods found that genetically inferred caffeine sensitivity related to coffee taste preferences more strongly than genetically inferred bitter-taste perception. The authors interpreted this as consistent with an interaction between physiological caffeine effects and conditioned taste preference, not a simple “bitter-gene determines coffee liking” story.
How people can learn to like bitter coffee
Acquired taste is a useful everyday phrase, but several mechanisms can sit underneath it. Repeated exposure can make a once-unfamiliar flavor more predictable. Social context can change what a drink signifies. Sweeteners or milk can provide a bridge while a person learns the aroma profile. And caffeine itself can act as a reinforcing post-ingestive consequence for habitual consumers.
Controlled human experiments demonstrate the reinforcement route. When a novel flavor was repeatedly paired with caffeine, pleasantness for the caffeine-paired flavor increased relative to a placebo-paired flavor in moderate caffeine consumers. These experiments support conditioned flavor learning, although they do not show that every coffee drinker will learn to enjoy bitterness or that caffeine is the only reason coffee preferences develop.
That boundary matters for CF28. This article explains why coffee tastes bitter and how bitterness is produced and perceived. The broader question of why people learn to enjoy bitter coffee — including exposure, reward, habit and acquired preference — belongs to Why Do People Learn to Like Bitter Coffee? Acquired Taste, Exposure, and Reward.
Expectation changes perception without changing the coffee’s chemistry
A label cannot change the chlorogenic acid lactones already dissolved in the cup, but it can change what a person expects and therefore how sensory information is interpreted. Coffee is a strong example of the broader principle that perception combines incoming sensory signals with prior information.
In a study of professional coffee tasters, origin information and storytelling altered ratings of attributes such as acidity and overall flavor even though the sensory sample itself was the object being evaluated. The result shows that expertise does not make perception context-free; information can still bias or direct attention toward particular dimensions of the cup.
Consumer work points in the same direction. In an experiment comparing subjective sensory descriptions, objective production information and no information, subjective tasting information increased taste ratings and preference, with effects also analyzed in relation to PROP taste sensitivity.
This does not mean bitterness is imaginary. The chemical stimulus is real, and trained sensory research can measure systematic effects of roast and extraction. It means the final experience of “how bitter this coffee tastes to me” includes both stimulus properties and perceptual interpretation.
Common myths about bitter coffee
Myth: caffeine is the reason coffee is bitter
Caffeine is one bitter component, yet coffee bitterness also depends on roast-derived compounds, chlorogenic-acid chemistry, brew concentration and matrix interactions. Recent sensory chemistry shows that the coffee matrix can even reduce caffeine’s bitter impact relative to caffeine in water.
Myth: darker coffee is bitter because it has more caffeine
Roast color and caffeine dose are separate variables. Dark roast can taste more bitter because roasting changes chemistry and sensory profile. Total caffeine in a serving depends on species, dose, mass or volume measurement, brewing method, extraction and serving size. Bitter flavor is not a caffeine meter.
Myth: boiling water burns coffee grounds
Coffee beans have already been roasted at temperatures far above brewing-water temperatures. Hotter water can accelerate extraction and can produce a different result in a fixed recipe, but “the water burned the grounds” is not the useful mechanism. Controlled work shows that when brew strength and extraction are held constant, modest differences within common hot-brewing temperatures can have little sensory effect.
Myth: any bitterness proves over-extraction
Coffee contains inherent bitter compounds, and roast degree strongly affects bitterness. High extraction can intensify bitter, astringent and roasted attributes in many conditions, but bitterness alone is not a diagnostic measurement. Use brew time, flow, strength, roast, uniformity and sensory quality together.
Myth: bitterness tells you whether coffee is high quality
Bitterness intensity and quality judgment are different dimensions. A bitter component can be pleasant in one sensory profile and overwhelming in another. Modern professional evaluation explicitly separates descriptive sensory assessment from affective or quality judgment. Preference also varies among consumers.
When a coffee suddenly starts tasting bitter
A sudden change is often easier to diagnose than a long-standing preference. Ask what changed immediately before the problem appeared: a new bag, a different roast date, a grinder adjustment, a descaling or cleaning cycle, a new water source, a changed filter, altered dose, machine temperature, or a slower drawdown.
If several unrelated coffees all become bitter at once, look first at the shared system: grinder, water, brewing equipment and technique. If only one coffee remains bitter while others brew normally, roast profile, bean composition and the recipe match for that specific coffee become more likely explanations.
A scientific way to troubleshoot: treat brewing like a small experiment
The fastest route out of random brewing changes is to control variables. Record coffee dose, water mass, grind setting, brew time, water temperature and the sensory result. Change one factor in the next brew. This converts “my coffee is bitter” into a testable question such as “Does one step coarser reduce the drying finish while preserving sweetness?”
This method also prevents a common cognitive trap: changing three variables, getting a better cup, and then assigning the improvement to whichever change you expected to work. Coffee science is complicated enough that disciplined comparison beats intuition alone.
What the evidence supports — and what it does not
The evidence strongly supports several conclusions. Coffee has intrinsic bitterness from multiple compounds. Roasting creates and transforms bitter tastants. Brew strength and extraction yield jointly affect bitterness and other sensory attributes. Particle size, time, temperature, water and brew ratio alter extraction dynamics. Individual sensory sensitivity varies. Expectation and learned associations can influence perception and preference.
The evidence does not support reducing every bitter cup to one cause, using bitterness as a direct caffeine measure, inferring a person’s personality from a preference for black or bitter coffee, or assuming that one universal recipe produces the same optimum for every coffee and every drinker. The 2023 Brewing Control Chart work is especially important here: consumer liking formed more than one preference cluster rather than one universally preferred point. The practical goal is therefore a reproducible sensory profile you actually prefer, not obedience to a single mythical coordinate.
FAQ
Why does my coffee taste bitter?
The most common possibilities are roast-derived bitterness, a brew that is too concentrated for your preference, extraction that is too aggressive or uneven, a grind that is too fine for the method, excessive contact for that recipe, unsuitable water, dirty equipment, or a combination of these. Bitterness is natural in coffee, so the goal is balance rather than zero bitterness.
Is bitter coffee always over-extracted?
No. High extraction can increase bitterness, astringency and roasted notes, but roast chemistry and strength also matter. Uneven extraction can produce bitter and sour sensations in the same cup. Use bitterness as one clue, not as a laboratory measurement of extraction.
How do I make coffee less bitter?
First identify whether the problem is bitterness, astringency, burnt flavor or concentration. Then change one variable at a time. For a slow, drying filter brew, try a slightly coarser grind. Test dilution if the cup is simply intense. Moderate temperature or contact time when appropriate, clean the equipment, and consider a lighter roast if roast-driven bitterness dominates every recipe.
Does a finer grind make coffee more bitter?
It can. Finer grinding usually increases extraction rate and can slow percolation, both of which may raise bitterness in a given recipe. But very fine or uneven grinding can also cause channeling and uneven extraction, so the result is not always a simple monotonic increase in bitterness.
Does hotter water make coffee bitter?
Hotter water accelerates extraction in a fixed setup, so lowering temperature can be a useful practical lever. However, when brew strength and extraction yield were experimentally matched, drip coffee brewed at 87, 90 and 93°C showed little sensory difference. Temperature matters mainly as part of the extraction system, not as an isolated “burning” switch.
Is dark roast more bitter than light roast?
Dark roasting generally shifts the profile toward more pronounced roasted, burnt, ashy and bitter dimensions, while lighter roasting often preserves more acidity and origin expression. Individual coffees and brew conditions vary, so roast degree changes the probability and character of bitterness rather than guaranteeing one fixed intensity.
Is caffeine what makes coffee bitter?
Caffeine is bitter, but it is not the only bitter compound and it is not a reliable predictor of perceived bitterness in brewed coffee. Chlorogenic acid lactones, phenylindane-type roast products and coffee-matrix interactions all contribute.
Why can coffee taste sour and bitter at the same time?
Because a brew is a mixture of many extracted regions and compounds. Uneven flow or particle distribution can leave some material lightly extracted and other material heavily extracted. Sourness and bitterness are separate sensations, so they can coexist.
Why does my coffee taste bitter even when the grind is coarse?
The roast may be inherently bitter, the beverage may be very concentrated, the water or equipment may be contributing, or the grind distribution may still contain many fines. A coarse setting does not guarantee low extraction or low bitterness across every brewing method.
Do people learn to like coffee bitterness?
Some people do. Repeated exposure, familiarity, social context, aroma learning and caffeine-associated reinforcement can all contribute. Human conditioning studies show that pairing a flavor with caffeine can increase its pleasantness in moderate caffeine consumers, but this does not mean every person will learn to enjoy strongly bitter coffee.
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