Functional Fueling Nutrition

Functional Fueling Nutrition Functional Nutrition Solutions for Thyroid and Hormone Imbalances.

We are a team of registered dietitian nutritionists that specialize in personalized, evidence-based nutrition solutions for hypothyroidism, hashimotos, PCOS, and other hormonal imbalances. Functional Fueling Nutrition is a Los Angeles and virtual based nutrition practice specializing in functional medicine and hormones. Our Registered Dietitian, Lauren, helps women ages 25-55 restore hormone imbal

ances using advanced lab testing and functional nutrition to get to the root cause and achieve optimal healing.

04/15/2026

Nitric oxide is a key signaling molecule that helps dilate blood vessels, improve circulation and support the delivery of hormones to their goal locations throughout the body.

It’s produced in the endothelium (your blood vessels) and supported by the oral microbiome —making the health of both critical for nitric oxide production.

In this week’s podcast episode, I’m joined by leading nitric oxide researcher to discuss his work over the last 25 years and the profound impact this molecule has on health outcomes.

We explore how nitric oxide and blood flow influence thyroid hormone utilization, fertility and implantation, and even conditions like preeclampsia.

Comment “nitric oxide” and I’ll send you the link to listen to the full episode

If your period has gone completely missing and all you’re told is that you’re exercising too much or have too low of bod...
04/14/2026

If your period has gone completely missing and all you’re told is that you’re exercising too much or have too low of body fat, there’s a whole lot more to the equation missing from that conversation.

While things like energy availability (the balance of expenditure from exercise + activity to dietary intake) and abrupt changes in body fat reserves do influence your cycle, they’re rarely the drivers we find in practice causing hypothalamic amenorrhea.

Reproduction and the menstrual cycle only happens when there’s enough extra energy after energy has been allocated to more important tasks in the body like your brain, your immune system, etc.

So when energy is being readily used up in other places and/or there’s not good energy utilization by our cells thanks to low T3 levels, the reproductive system is one of the key places that takes a hit.

It’s an adaptive response, our body trying to protect us! As part of this process, your active thyroid hormone, T3 levels drop as your body turns down the thermostat to conserve energy.

In this week’s blog we dive into two real cases of HA that we worked with in practice and successfully supported to menstrual recovery, and for one, pregnancy!

If you’re experiencing no period or irregular ones and still in those prime reproductive years, this is a must read to understand the bigger picture beyond standard eat more, move less advice.

Comment “ha cases” and I’ll send you a link to listen!

04/10/2026

If you’ve ever felt frustrated when you ask for a thyroid panel to only get back TSH, there’s a reason why this is.

Thyroid meds like levothyroxine lower TSH quickly—often faster than they meaningfully change your overall thyroid hormone (t4 and t3) output.

And since this system is a feedback loop the idea is that if your TSH decreases, your level of thyroid hormone has improved. But unfortunately that’s not the case for many which is why majority of individuals with hypothyroidism on thyroid hormone replacement are still symptomatic.

In conventional care, thyroid medication is the only tool in the toolbox for addressing thyroid dysfunction. Most dr’s aren’t trained in treating root causes of thyroid dysfunction with things like nutrition, supplements or lifestyle. And it’s these approaches that influence thyroid hormones like T4, T3 and thyroid antibodies the most.

TSH reflects brain to thyroid communication, not full-body thyroid function

So while it’s helpful for monitoring medication adjustments, it doesn’t tell you how well your cells are actually using thyroid hormone.

This is why a “normal or even optimal TSH” doesn’t always mean optimal thyroid function, especially if symptoms are still present.

I break this down in further detail in this week’s podcast episode, comment “stimulation” and I’ll send you a link to listen!

Fertility is often approached as simply only a hormone or progesterone issue.And while hormones deeply matter, at the ro...
04/09/2026

Fertility is often approached as simply only a hormone or progesterone issue.

And while hormones deeply matter, at the root it’s about whether the body has the right environment to support it.

Thyroid signaling, immune balance, and energy production all play a role in whether ovulation happens consistently and whether the body is balanced and supported adequately to sustain a pregnancy.

One of the most overlooked disruptors we see in practice is thyroid autoimmunity.

Because even when TSH and thyroid hormone levels fall within range, antibodies can still be active in the background impacting:

→ Egg quality
→ Ovulation
→ Implantation and immune tolerance in early pregnancy

This is where so many women get labeled with “unexplained infertility”…
when there is a root cause it’s just not being assessed or addressed.

In our new blog, we break down:
- how thyroid autoimmunity impacts fertility
- the immune systems role in fertility
- Patterns We See in “Unexplained Infertility”
- Our Root-Cause Approach to Restoring Fertility

Comment “thyroid immune fertility” and I’ll send you the link to learn more

03/29/2026

Cyclical headaches around ovulation or before your period?

Today, one of our clinicians, , is breaking down a pattern we see all the time inside our practice.

Hormonal migraines most commonly show up in two key windows:
• Around ovulation (estrogen peaks)
• Right before your period (estrogen + progesterone drop)

Here’s what’s actually happening:

Estrogen can amplify histamine + inflammation, increasing blood vessel dilation (a key migraine trigger).
Progesterone helps calm that response.

So when hormones shift, especially on top of underlying inflammation, your threshold for migraines drops.

This is exactly why our approach goes deeper than symptom management.

Inside our 1:1 work, we’re looking at:
• Hormone patterns and how they all coordinate and influence each other
• Thyroid + energy production (low T3 patterns)
• Stress + immune-driven inflammation

In this week’s blog, we break down more about how to understand the key root causes of hormonal migraines

Comment “HORMONAL MIGRAINE” and I’ll send you the link.

03/19/2026

If you’ve been experiencing chronic vaginal infections like yeast infections or BV, here’s what you should know.

Many patients come to us already feeling defeated. Alongside hormonal, digestive, and immune symptoms, they’re also dealing with recurring vaginal infections.

They’re often prescribed antibiotics and sent on their way, only for symptoms to return the next month.

Think of these as opportunistic infections. When the terrain of the endocrine and immune systems is compromised, they continue to recur because the body doesn’t have the right environment to keep them in check.

That’s why looking deeper, at chronic immune stress, the microbiome, and estrogen balance is such an important and often overlooked piece.

We start by running the right testing to understand what’s happening in these systems, then support healing through a phased approach targeting both immune and hormone function.

Comment or DM “🍑” and I’ll send you a link to our recent blog where we break down these root causes and next steps!

Many people with Hashimoto’s are told the same thing: “There’s nothing you can do about it.”But in my experience working...
03/17/2026

Many people with Hashimoto’s are told the same thing: “There’s nothing you can do about it.”

But in my experience working with hundreds of individuals with Hashimoto’s, many of whom are already eating well and exercising when they come to work with us, we often see meaningful improvements in symptoms, antibody levels, and disease progression through our work together.

When patients come to us with Hashimoto’s, our workup goes far beyond checking TSH. We look at the physiology driving why thyroid function became disrupted in the first place.

That means evaluating patterns across multiple systems in the body, including:

• immune activation and inflammation
• viral or environmental triggers
• mitochondrial and metabolic function
• nutrition and exercise stress
• gut-immune signaling
• hormonal and nervous system patterns

Because when these key systems become dysregulated, the immune and endocrine systems can as well.

Our goal is to identify the underlying drivers contributing to autoimmune activation and thyroid dysfunction, so we can build a strategy that supports the body as a whole.

In many cases, we begin by supporting immune balance, and once that system stabilizes, we shift our focus to optimizing thyroid hormone function itself.

Every patient receives a personalized clinical roadmap with phased treatment, education, and adjustments along the way based on their history, lab patterns, symptoms, and response to care.

If you have Hashimoto’s and feel like you’ve tried everything but still don’t feel like yourself, there may be deeper patterns worth exploring.

Learn more about working with our team at the link in bio 🤎

03/14/2026

Dopamine is a neurotransmitter produced in the brain that helps keep prolactin levels in check 🧠

It does this by sending signals to the pituitary gland where prolactin is made, to slow down prolactin release.

But when dopamine output decreases, prolactin levels can rise.

One very common reason this happens is chronic stress. Stress can suppress dopamine production, which removes that key regulatory signal from the brain. Without dopamine helping regulate prolactin, prolactin levels can begin to climb.

Over time, chronically elevated prolactin can interfere with cycles by lowering estrogen and progesterone, which can contribute to irregular cycles or anovulatory cycles.

This is something we commonly see when working with our 1:1 clients, which is why prolactin is a hormone we often evaluate when someone is experiencing irregular cycles, fertility challenges, or low thyroid function.

In this week’s episode of the Hormones podcast, and I break down the dopamine–prolactin connection, other reasons prolactin may be elevated, and what to look for if your prolactin levels come back high.

Comment “PROLACTIN” and we’ll send you the link to listen

03/12/2026

There’s a lot of factors that go into pre-conception support but if I had to pick the one that has the most profound impact on outcomes it would be this.

Like most things it’s a two way street, we have to first address what’s driving the oxidative stress and then replenish the body of targeted antioxidants to neutralize it.

This process starts in the immune system where we look at processes that are causing what I call ‘energy leaks’ to occur. Essentially energy is getting diverted away from reproduction and towards more essential processes like regulating immune function. This often comes down to areas like chronic viral load, mold and the gut microbiome.

But we also look at psychological stress/nervous system state and exercise stress because exercise is another overlooked source of oxidative stress. This oxidative stress during exercise is necessary to get stronger and fitter but when it goes uncontrolled or when the body doesn’t have the resources to extinguish this fire quickly, it becomes chronic inflammation, breaking down hormone communication.

Targeted nutrition, exercise modifications, immune system modulation via , therapeutic vitamins and minerals are all part of the puzzle pieces to restore balance to this system, ultimately improving egg quality, ovulation, implantation and even thyroid hormone function.

Listen to the full conversation on Everything Is the Best Podcast with 🤎

03/10/2026

Elevated ApoB? It’s not just ‘bad genetics’

While ApoB levels are estimated to be about 40–78% genetically driven, genetics are only one part of the story.

If you’ve ever had a more advanced lipid panel done, you’ve probably had your ApoB levels tested.

Why we care about it is because ApoB tells us how many atherogenic particles are circulating in the blood, and it’s considered one of the strongest markers we have for cardiovascular risk.

While genetics influence ApoB levels, I’ve seen dramatic clinical improvements when we address the metabolic hormones that regulate lipoprotein production and clearance and their root causes.

Two of the biggest hormonal drivers: insulin and T3.

When insulin is chronically elevated or thyroid signaling is impaired, the liver makes more ApoB particles and clearance of these particles slows.

When we improve these metabolic hormones by improving blood sugar regulation and t3 levels, ApoB often improves alongside it.

ApoB isn’t just about the heart, it’s driven by metabolic hormones and the root causes influencing them.

We break down ApoB, lipoproteins, and the cardio-metabolic connection in this week’s blog.

Comment “cardio metabolic” and I’ll send you a link to learn more

Address

San Diego, CA

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

+16193792416

Website

Alerts

Be the first to know and let us send you an email when Functional Fueling Nutrition posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Practice

Send a message to Functional Fueling Nutrition:

Shortcuts

Featured

Share

Category

Our Story

Functional Fueling Nutrition is a nutrition private practice owned by Lauren Papanos, MS, RD, CSSD. Lauren specializes in a root-cause, personalized approach to nutrition. Lauren is a Registered Dietitian Nutritionist, a board certified Specialist in Sports Dietetics and is trained in functional nutrition. She holds both her bachelor’s and master’s degrees in Nutritional Sciences. She has worked as a Division I Power 5 Performance Dietitian as well as in outpatient functional medicine clinics. She has been featured on websites like Women’sHealthMag.com, Active.com, Insider.com and published research in several medical journals.

Her specialties include:


  • thyroid and metabolism

  • women’s hormones