The Art of the Japanese Gut Reset: Everything You Need to Know About Enzyme Fasting

If you have been looking for a sustainable way to refresh your system and give your digestion a proper break, it is worth looking towards an old East Asian ritual that is having a modern moment: enzyme fasting, known in Japan as Koso fasting (酵素ファスティング).

Unlike a strict water fast, which can leave you feeling depleted and foggy, this tradition uses a fermented drink to take the edge off a break from solid food, rather than making you white-knuckle through it. Here is the thinking behind how it works, and how a half-day pour of JIN JIN fits into a gentler version of the ritual.

The science of a break from food

In 2016, the biologist Yoshinori Ohsumi won the Nobel Prize in Physiology or Medicine for his work mapping out autophagy: the process by which cells break down and recycle their own damaged components. His research is part of why periods without food have drawn serious scientific interest, not just wellness interest.

A small 2019 study from the Okinawa Institute of Science and Technology and Kyoto University looked at blood metabolites in four people during a 58-hour fast and found a rise in several antioxidant-related compounds, alongside markers the researchers linked to cellular energy production. It is a genuinely interesting early finding, though worth being honest that it was four people over one fast, not a verdict on what fasting does for everybody. We are not aware of research on JIN JIN itself and autophagy, so we would not want to suggest otherwise: the drink is not a trigger for cellular repair, it is simply a traditional way to make a food-free stretch easier to sit with.

Koso: easing a fast rather than enduring one

The idea behind Koso is that it is not a starvation exercise. Rather than drinking only water, the tradition uses a fermented botanical drink, sipped slowly through the hours you would normally be eating.

JIN JIN is a naturally fermented concentrate (enzymatic cordial) made from 30 plus plants, which is exactly the kind of drink this tradition is built around: something with enough flavour and body to make a break from solid food feel considered rather than like deprivation. It will not do your digesting for you, but it gives you something proper to sip on while your gut gets a rest.

A simple half-day ritual with JIN JIN

You do not need a multi-day fast to borrow from this idea. The most common everyday version in Japan is a half-day reset, and this is where a bottle of JIN JIN earns its place.

• The morning break: skip a heavy breakfast. Instead, mix 20ml of JIN JIN into 200ml of still or sparkling water and sip it slowly through the morning.
• The clean lunch: break the half-day fast with something light. Vegetables, healthy fats, or a fermented soup like miso are a gentle way to wake your digestion back up.
• Stay hydrated: plenty of water or warm herbal tea through the day alongside your JIN JIN.

Give your digestion a short break this week, and let a considered drink carry you through the morning instead of a heavy breakfast. Read more about the fermentation behind JIN JIN on our story page, and stock up on your bottle at the JIN JIN shop.