Jenna Greenfield MD, Medical science writing, rigorously accurate, yet clear and engaging writing on medical and health science topics.

Science-Informed Health Content

 Consumer-facing health content requires a careful balance: clarity without oversimplification, engagement without hype, and scientific accuracy without unnecessary technical detail. I write accurate content grounded in clinical knowledge, with an ease and tone that readers find clear and relatable.

Whether the priority is clarity of a complex topic, or a lighter, less information dense piece meant to grab the readers attention and keep them hooked.

Includes:

• Wellness and preventive health articles

• Consumer-friendly guides

• Educational content for apps and digital platforms

• Longevity, metabolic health, and recovery topics

• Infrared sauna and heat therapy expertise

• Research-informed content written for broad audiences

Typical formats:

• Blog posts and long-form wellness articles

• Consumer health guides and brochures

• App-based educational modules

• Email sequences and program content

• Evidence-informed lifestyle health resources

Ideal for:

• Wellness and lifestyle brands

• Consumer health companies

• Digital health apps and platforms

• Longevity, recovery, and metabolic health programs

• Brands seeking evidence-informed but approachable content

Writing Samples

This category includes any consumer facing content, and can cover a range of tones and information densities. The excerpts below represent some of that range.

I tailor the tone and the technical complexity to the audience and the project.

When Everything Hurts and Nothing is Wrong

When Everything Hurts and Nothing is Wrong

The test results were normal. 

All of them. 

Again.

Jennifer sat quietly as her doctor flipped through lab reports and imaging studies, scanning for answers that weren’t there. Blood counts, normal. Thyroid normal. Inflammatory markers, normal. MRI normal. A long column of “within normal limits.”

On paper, everything looked fine.

But Jennifer was not fine.

She was 42 years old and could barely make it through a workday without lying down. Her body hurt, constantly, everywhere.  An aching that made every simple task feel monumental. Her brain felt submerged in sticky goo. She forgot words mid-sentence. Forgot why she had walked into rooms. Lost her keys and found them later in the refrigerator. 

She was exhausted but couldn’t sleep. And when she did sleep, she woke up feeling like she’d been hit by a truck.

“So what’s wrong with me?” she asked.

Her doctor hesitated, shuffling the papers again as if the answer might suddenly appear.

“Well,” he said gently, “have you considered that this could be stress-related?”

Jennifer stared back at him, too tired for anger. She had heard this before. Six doctors in three years. Endless tests. Endless reassurance that nothing was wrong, followed by the quiet implication that she was making this all up.

But it wasn’t in her head.

The pain was real.

The exhaustion was real.

She was suffering.  And no one could tell her why.

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Heat Transfer: Why Temperature is Not the Whole Story
science explainer Jenna Greenfield MD science explainer Jenna Greenfield MD

Heat Transfer: Why Temperature is Not the Whole Story

Heat therapy involves transferring sufficient heat to your body to raise the temperature of your tissues and core. This temperature increase activates heat shock proteins and strengthens your cells and tissues. I want to teach you how to reap these benefits, but I don't just want to prescribe a protocol—I want you to understand the concepts. Facts memorized are easily forgotten, but concepts understood will stick with you, enabling you to adapt and apply your knowledge far beyond the basics. So, let's start with some fundamentals

When temperature isn't just... temperature

Sauna Myth: One of the most persistent sauna myths involves the air temperature of infrared saunas. You might have heard that infrared saunas must reach a specific air temperature—commonly 170°F—to be effective.

I get it. We humans love numbers and quantifiable goals—clear targets we can aim for. But what if I told you that you receive more heat faster in an infrared sauna at 130°F than in a traditional sauna at 170°F? And that while a traditional sauna is appropriately used at 170°F, an infrared sauna at this air temperature would deliver a potentially dangerous amount of heat?

Think about this: Anyone who has used saunas, or survived a summer in the South knows what 110°F air feels like— lying in the shade or in a sauna it is pleasantly warm, maybe inducing a light sweat. But water at 110°F? You'd pull your hand back in pain.

"Room temperature," where we feel neither hot nor cold, hovers around 70°F. But if you've ever checked a "cold" swimming pool's temperature, you know that 70°F water feels unpleasantly cold even on a scorching day. This is the pool day where moms watch from the side as kids insist "it's not cold" through chattering teeth and blue lips. Swimming pools are usually maintained between the high 70s and low 80s, and even water in the 80s feels refreshingly cool rather than warm.

Why such a difference in our perception? The difference is that water is a much better heat conductor than air—it transfers heat to us, and takes heat away from us, much more efficiently than air. In fact, air is one of the worst heat conductors, which is precisely why it makes the best insulator. When you pay a premium for that down or PrimaLoft® ski jacket, you're essentially paying for air. Those materials trap air better than any others, preventing heat transfer from you to the environment.

Your perception of heat depends on the rate at which heat is transferred to you. Temperature is just a small part of the story. This is crucial in understanding why air temperature in an infrared sauna doesn't accurately measure the amount of heat you're receiving. Infrared doesn't heat you through the air—it heats you directly, with light.

Methods of Heat Transfer

There are three primary methods of heat transfer:

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