We know we are made up of mostly water, and that drinking plenty of it keeps us vibrant, flowing, and glowing. But there’s one key factor missing from the hydration conversation: temperature.
That ice water you’ve been sipping all day while convinced you’re doing something good for your body? It might actually be working against you.
In reality, hot water may be the simplest upgrade you’re not making.
Say hello to your inner biome.
You already know good gut health is key for your skin, energy, mood, and digestion. But Dr. Ellie Byun, a licensed acupuncturist and celebrity facialist, takes it a step further with a concept she calls the inner biome.
“The inner biome is the foundation of my entire approach to health, beauty, and longevity,” she says.
Dr. Ellie defines it as the body’s internal ecosystem, regulated through the balance of temperature, energy, and organ function, and it goes well beyond the gut. It’s a full-body system where temperature, energy, and flow all have to work together.
In Korean medicine, that balance is understood through the relationship of yin and yang within the body’s organs. And when it’s off? You feel it everywhere.
In Dr. Ellie’s approach, she argues that many of the common imbalances people struggle with—like sluggish digestion, low energy, skin issues, and poor circulation—trace back to disrupted temperature regulation inside the body.
“When the system becomes too cold or too heat-driven internally, it can affect digestion, metabolism, circulation, and even skin health,” she explains.
That’s where our water habits come in.
“Drinking cold water on an empty stomach in the morning,” she says, “can disrupt digestive activation and throw the system off before your day has even started. Warm or hot water, on the other hand, helps support circulation and gently activates the system, working with your body instead of against it.”
There’s more: the skin connection.
This is where things get really interesting because the inner biome isn’t just about digestion. When your internal temperature balance is restored, the body can regulate itself more efficiently, and that efficiency shows up in your skin.
Better circulation means better delivery of nutrients. A more balanced internal environment means less inflammation trying to work its way out.
Dr. Ellie puts it simply. “By restoring proper temperature balance within the inner biome, the body can regulate itself more efficiently, supporting better energy, digestion, and skin health from within.”
One thing she is clear about: There’s no universal fix.
“True balance comes from personalization.”
Each person has a unique internal temperature profile and metabolic rhythm, which means the adjustments that work for you might look different than what works for someone else. That said, swapping cold water for hot—especially first thing in the morning—is one of the most universally transformative shifts you can make to get all systems going in the a.m.
Considering that morning hydration is vital, this small habit change carries real impact. And if we’re being honest, doesn’t a warm mug in the morning sound a lot better than a cold glass?
The content provided in this article is provided for information purposes only and is not a substitute for professional advice and consultation, including professional medical advice and consultation; it is provided with the understanding that Poosh, LLC (“Poosh”) is not engaged in the provision or rendering of medical advice or services. You understand and agree that Poosh shall not be liable for any claim, loss, or damage arising out of the use of, or reliance upon any content or information in the article.
