liver
ingredient / ingredient-liver
レバー / liver (mammal/poultry, as food)
Liver is a general term for edible mammalian and avian livers. Culinary sources in several languages describe removing the accompanying bile-containing gallbladder (fiele/Galle/gallbladder, etc.) without rupturing it as preparation to avoid bitterness. Fish livers are treated separately.
On this page (7 sections)
Reading the bitterness
Edible mammalian and avian liver secretes bile. A German-language food encyclopedia says "Außerdem sondert sie die zur Fettverdauung notwendige Galle ab, welche auch für den leicht bitteren Geschmack der Leber verantwortlich ist" (in translation: "It also secretes bile needed for fat digestion, which is also responsible for the liver's slightly bitter taste").
The same article describes beef liver as "Die Leber des Rindes ist rotbräunlich und schmeckt kräftig, bisweilen etwas bitter" (in translation: "Beef liver is reddish brown and tastes strong, sometimes slightly bitter"). The article has no footnotes, however; it presents general culinary and food knowledge without identifying its sources.
On bile itself, a 2023 paper states "the body fluid bile containing the endogenously produced compound class of bile acids tastes extremely bitter" and treats bile acids as bitter substances. This is a general statement in the paper's introduction, not a direct sensory measurement of bitterness when liver is eaten as food.
A 2026 review cites an experiment in which pork liver was hydrolyzed with the protease Alcalase for 30 minutes and reports that bitter amino acids increased along with umami and sweet amino acids. Bitter amino acid content rose from 2.563 to 22.627 mg amino acid/g liver. These are values from an earlier study cited by the review.
In a chicken-liver fermentation experiment cited by the same review, the umami free amino acids glutamate and aspartate increased by 14.6% and 32.3%, respectively, while the bitter free amino acids valine and leucine decreased by 37.9% and 41.4%, respectively. These too are values from a prior study cited by the review.
Sources for this overview
Checked for this overview: Used the statement that bile is one cause of liver's slight bitterness. / Used the verbatim description that beef liver is sometimes bitter.
Physiological activation of human and mouse bitter taste receptors by bile acids
Checked for this overview: Used the introductory passage in which bile acids are described as bitter substances.
Checked for this overview: The quantitative increase in bitter amino acids after Alcalase hydrolysis. / The decrease in bitter free amino acids after fermentation.
Other names: Leber (de)
Structured claims — open a section to read each claim's confidence, evidence and limits
Sensory (1)
Scope: The German-language Wikipedia article "Leber (Lebensmittel)"
Note: Presented as general culinary/food knowledge, without a footnote.
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ingredient-liver —has_perceived_bitterness_associated_with→ "Bile (Galle), needed for fat digestion. Beef liver in particular is described as "robust, sometimes somewhat bitter.""How processing and cooking change it (2)
Scope: Layer: literature (second-hand citation). Data from a pork-liver Alcalase hydrolysis experiment by López-Martínez et al. cited in a review (original study not read).
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ingredient-liver —has_composition→ "Enzymatic hydrolysis with the protease Alcalase generates and increases bitter amino acids along with umami and sweet amino acids. In an experiment treating pork liver with Alcalase for 30 minutes, bitter amino acid content increased from 2.563 to 22.627 mg amino acid/g liver."Scope: Layer: literature (second-hand citation). Data from a chicken-liver fermentation experiment by Wang, Lan, Yang, Yang, Ma, Cheng, Xia, Xu, Wang, Zou, and colleagues cited in a review (original study not read).
Note: The primary study was not read; the claim is second-hand through a review. The review summarizes that enzymatic hydrolysis tends to produce bitter peptides, whereas fermentation tends to suppress bitterness while preserving umami.
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ingredient-liver —has_perceived_bitterness_suppressed_by→ "Fermentation treatment. In conventionally fermented chicken liver, the umami free amino acids Glu and Asp increased by 14.6% and 32.3%, respectively, while the bitter free amino acids Val and Leu decreased by 37.9% and 41.4%, respectively."