I scientifically investigated why people who can't drink alcohol can only drink fukurozuri sake.

Many people who dislike alcohol feel a complex discomfort associated with alcohol, rather than the alcohol itself.

In pressing methods that apply pressure, the following components can mix into the sake:

• Lipid components from rice (such as higher fatty acids derived from cell membranes)
• Protein decomposition products (causes of astringency and bitterness)
• Polysaccharides derived from cell walls (causes of stickiness and heaviness)
• Easily oxidized trace components (precursors to off-flavors)

These are called "unpleasant flavors" and are strongly perceived by sensitive individuals as "off-putting aroma," "harshness," or "bad aftertaste" in sake.

With fukuro-tsuri, no external pressure is applied, so these components are not squeezed out at all.

What drips out of the bag is only the pure liquid portion that naturally liquefies within the moromi.

As a result, sake with virtually zero negative taste stimuli caused by unpleasant flavors is produced.

Scientific Reason ②: Water molecules and alcohol molecules are in a "perfectly blended state"

The "sharp sting" or "muddled feeling" experienced when drinking alcohol.

This phenomenon occurs when alcohol (ethanol) volatilizes on its own.

Chemically speaking, water (H₂O) and ethanol (C₂H₅OH) are linked by hydrogen bonds, but when external stress (mechanical vibration, pressure, temperature change) is applied, these bonds are disturbed, and ethanol tends to become "unbound" from water.

Unbound ethanol is highly volatile and directly irritates the oral cavity, nasal mucosa, and esophagus. This is what is known as the "sharpness of alcohol."

Fukuro-tsuri applies no mechanical stress at all, so the hydrogen bonds between water and alcohol that naturally formed during fermentation remain almost completely intact.

By maintaining a state where water molecules and alcohol molecules are intricately bonded within the liquid, the amount of volatile unbound ethanol is significantly reduced.

This is the scientific reason why fukuro-tsuri sake is perceived as "smooth on the throat" and "lacking the harshness of alcohol."

Reference: BUNSEKI KAGAKU Vol. 57, No. 3 The Role of Solutes in the Hydrogen Bonding of Water-Ethanol Mixed Solvents by Shoji Hojo and Akina Nose

Reference:ResearchGate Interaction between water and ethanol via hydrogen bonding in alcoholic beverages

Scientific Reason ③: The "silky texture" arises from the absence of physical friction

The "drinkability" of a liquid is determined by its viscosity, surface tension, and the amount of fine particles (colloids).

In pressure pressing, strong pressure crushes cell walls, and fine solid particles mix into the sake.

This gives the liquid a "roughness," "catch," and "heaviness."

Taste buds and tactile receptors on the tongue sensitively detect this physical stimulus and transmit it to the brain as "difficulty in drinking."

In fukuro-tsuri, cell crushing does not occur, so there are virtually no solid particles mixed into the liquid.

The colloidal state is very stable, resulting in a smooth liquid with uniformly maintained surface tension.

This is why many people describe it as "like water" when they drink it.

In reality, a rich umami flavor is present.

However, there is no physical catch on the tongue or throat, and it does not give the "heaviness" characteristic of alcoholic beverages.

Scientific Reason ④: Why is it "less burdensome on the body"? From the perspective of the liver and alcohol metabolism

Alcohol is broken down into acetaldehyde by alcohol dehydrogenase (ADH) in the body, and further metabolized into acetic acid by aldehyde dehydrogenase (ALDH).

What's important here is that components ingested with alcohol affect metabolic efficiency.

Some of the unpleasant components, especially lipid peroxides and certain amines, are suggested by research to interfere with metabolic pathways in the liver, inhibiting alcohol metabolism or prolonging the retention time of acetaldehyde.

Sake made with the fukuro-tsuri method has fewer unpleasant components, which is thought to create an environment where the liver can focus on alcohol metabolism.

The many testimonials of "feeling good the next day after drinking a lot" or "a milder intoxication" may be influenced by these differences in metabolic efficiency

(※individual differences apply).

Reference:PMC Chronic consumption of Japanese sake mediates radiation-induced metabolic changes in mouse liver

Summary: The reason why fukuro-tsuri is "gentle on the body" lies in the beauty of subtraction

Scientifically organizing the characteristics of fukuro-tsuri, its essence lies in "adding nothing, destroying nothing."

Without applying pressure, just hanging and waiting.

This act of "doing nothing" brings out the true, pure essence of sake.

For those who have come to dislike alcohol, or those who "just want to try a sip," we confidently recommend fukuro-tsuri sake.

Behind the mysterious experience of "I can't drink, but for some reason, I can drink this" lies sound science.

Please try a drop of fukuro-tsuri sake once.