Understanding pH Balance, Reams Testing, and the Role of Calcium in Physiological Regulation
- Dr. Sierra Stottsberry Ph.D., LMT
- Mar 22
- 13 min read
The human body is constantly working to maintain balance. Every second, it’s regulating temperature, hormones, minerals, and one of the most important internal markers of all… pH.
pH, or “potential of hydrogen,” reflects how acidic or alkaline the body’s internal environment is. While blood pH is tightly controlled within a very narrow range, other fluids like urine and saliva shift throughout the day in response to metabolism, stress, digestion, and nutrition.
These shifts aren’t random. They’re reflective.
When viewed through frameworks like Reams Biological Theory of Ionization, pH becomes less about a single number and more about a pattern of how the body is functioning. It can give insight into whether the body is balanced, compensating, or beginning to deplete.
Understanding RBTI: A Functional Look at the Body
Before diving deeper into pH, it helps to understand the framework being referenced.
Reams Biological Theory of Ionization is a functional assessment model developed by agricultural scientist Dr. Carey Reams. His work originally focused on soil health, where he studied how mineral balance and energy patterns influenced plant growth and productivity. Over time, those same principles were applied to human physiology, based on the idea that the body, much like soil, responds to measurable patterns of energy, mineral availability, and balance.
And in a lot of ways, we’re not as different from that as we think. We’re just a bit more complex. You can almost think of us as slightly more complicated houseplants, responding to what we’re given, the quality of our inputs, the environment we’re in, and whether the conditions support growth… or stress.
RBTI doesn’t approach the body as a collection of isolated systems. Instead, it looks at how everything is interacting at once, particularly how the body is producing energy, utilizing nutrients, and maintaining internal stability.
One of the primary ways this is evaluated is through urine and saliva testing.
These tests are simple, but the information they provide can be layered. In practice, measurements may include:
pH levels in urine and saliva
Mineral indicators
Sugar levels
Conductivity, which reflects electrolyte balance
These values aren’t viewed in isolation. They’re interpreted as patterns that reflect how the body is functioning in real time.
The goal isn’t to diagnose disease through these numbers. It’s to understand whether the body is:
Regulating efficiently
Compensating to maintain balance
Or beginning to deplete its reserves
RBTI is considered a functional and observational model, meaning it works best when combined with clinical context, symptoms, and a broader understanding of physiology.
At its core, it provides a structured way to look at something the body is already doing… constantly adjusting, responding, and trying to maintain equilibrium. The best part- this can be done in the office or right at home with just a little guidance!
What pH Represents in the Body
At a biochemical level, pH reflects the balance between acid producing and base producing processes. Every metabolic reaction creates byproducts, many of which influence hydrogen ion concentration.
To maintain stability, the body relies on three primary systems:
The lungs, which regulate carbon dioxide and influence acidity through respiration
The kidneys, which filter and excrete acids or bases through urine
Buffering systems, which use minerals and compounds to neutralize excess acidity or alkalinity
These systems are constantly communicating and adjusting. Even small shifts in pH can influence enzyme activity, oxygen delivery, digestion, and cellular signaling. This is why the body prioritizes maintaining balance, even if it has to compensate to do so.
Why Urine and Saliva Are Measured Together
Urine and saliva offer two different windows into what’s happening inside the body.
Urine reflects what the body is actively eliminating. It shows how the kidneys are handling metabolic waste, acids, and minerals. Because of this, urine pH can shift quickly based on diet, hydration, and metabolic demand.
Saliva tends to reflect broader systemic trends. It can give insight into how the body is regulating itself outside of elimination, including stress patterns, digestion, and mineral balance.
When these two are viewed together, they tell a more complete story. When they’re aligned, the body is often regulating efficiently. When they’re far apart, it can suggest that the body is compensating in one area to maintain balance in another.
The Concept of an Optimal pH
Within the RBTI framework, a pH of approximately 6.4 is often used as a reference point for efficiency.
This doesn’t mean that every person must always be at 6.4. Instead, it reflects a point where the body is thought to be functioning with relative ease, where digestion, enzyme activity, and elimination are working together rather than against each other.
Values below this may reflect increased metabolic demand, acid production, or depletion of buffering resources. Values above this may suggest slower digestion, reduced metabolic activity, or inefficiency in breaking down nutrients.
The goal isn’t perfection. It’s balance and adaptability.
Recognizing pH Patterns
Looking at patterns rather than isolated numbers allows for a deeper understanding of how the body is responding.
When both urine and saliva are around 6.4, the body is generally operating efficiently, maintaining equilibrium between production and elimination.
When both values are higher, this can suggest a more alkaline state where digestion may be underactive and nutrients aren’t being broken down as effectively. Over time, this can influence absorption and overall metabolic efficiency.
When urine is low and saliva is high, the body may be working harder than it can sustain. It’s producing acids but struggling to eliminate them efficiently, which can reflect stress, fatigue, or reduced digestive capacity.
When urine is high and saliva is low, the body may be compensating. It’s eliminating differently than it’s regulating systemically, which can point to imbalance between systems.
When both values are low, the body may be in a more depleted state. It’s moving quickly, using resources, and may not be rebuilding at the same rate.
These patterns aren’t diagnoses. They’re signals of how the body is functioning under current conditions.
Calcium as a Buffering Mineral
Calcium is often thought of as a bone mineral, but its role in the body is far more dynamic.
Only about one percent of calcium is circulating in the blood and tissues, but this small amount is critical for survival. It’s involved in nerve signaling, muscle contraction, heart rhythm, enzyme activity, and hormonal communication.
One of its most important roles is buffering.
When the body becomes too acidic, calcium can be used to help neutralize excess hydrogen ions and stabilize pH. This helps protect cellular function and maintain internal balance.
However, if the body is constantly relying on calcium to buffer without adequate intake or absorption, it may begin pulling calcium from its own reserves. Over time, this can contribute to imbalance and depletion.
Understanding the Different Forms of Calcium
Not all calcium behaves the same way in the body. The form it takes influences how it’s absorbed, where it travels, and how it supports balance.
Calcium carbonate is one of the most concentrated forms. Yes, that's chalk! It’s heavily dependent on stomach acid for absorption, which means its effectiveness is directly tied to digestive strength. When properly absorbed, it acts as a strong buffer and contributes to structural reserves, particularly in bone. However, in low acid environments, it may pass through without being fully utilized.
Calcium citrate is more soluble and doesn’t require as much stomach acid, making it more accessible in a wider range of individuals. It tends to move more freely through the bloodstream and soft tissues. Because of this, it often supports more systemic availability, but its alkalizing tendency can influence digestive efficiency if not balanced.
Calcium lactate is gentle and highly bioavailable. It’s closely tied to metabolic activity, particularly pathways involving energy and muscle function. It’s often associated with supporting the body when it trends too alkaline, helping bring it back toward functional balance without overwhelming the system.
Calcium gluconate plays a stabilizing role. It isn’t as concentrated, but it’s easy for the body to use. Rather than forcing a shift, it supports consistency, helping maintain steady calcium levels for nerve signaling, muscle contraction, and cellular communication. This makes it particularly valuable when the goal is regulation rather than correction.
Calcium phosphate is the structural backbone of the skeletal system. It forms the matrix that gives bones and teeth their strength. At the same time, phosphate is deeply involved in energy systems, particularly ATP production. This means this form of calcium isn’t just about structure, it’s directly tied to how the body produces and uses energy.
Calcium sulfate, while less commonly discussed, contributes to connective tissue integrity and detoxification pathways. It plays a supporting role in how the body processes and eliminates waste, particularly in the liver and extracellular matrix.
Ionized calcium is the most critical form in real time. It’s the free, active calcium circulating in the blood that the body uses immediately. It regulates heartbeat, nerve impulses, muscle contraction, and cellular signaling. The body prioritizes this form above all else, maintaining it even if it has to pull calcium from bone or tissue to do so.
Together, these forms represent a spectrum. Some are structural, some are regulatory, and some are immediately active. Understanding this allows for a more precise approach to supporting the body rather than assuming all calcium functions the same.
How Calcium and pH Work Together
Calcium helps stabilize pH by buffering excess acidity, but this relationship is dynamic.
When acid load increases, calcium can be mobilized to protect critical systems. This is a short-term solution that allows the body to maintain function under stress. However, if this becomes a long-term pattern, the body may begin to rely on internal reserves rather than dietary intake.
At that point, the body isn’t simply regulating. It’s compensating.
Recognizing this shift is key. It allows for intervention before depletion becomes more significant.
Food as Information: How the Body Processes What You Eat
Food isn’t just fuel. It’s information.
Every time you eat, you’re sending signals into your body. Those signals tell your system what to do, what to build, what to store, and what to eliminate. Your body is constantly reading that input and making decisions based on it.
One way to understand this is to think of your body like a computer.
The food you eat is the input, the data. But your body still needs the right “software” to process that data correctly. That software includes your digestion, your enzymes, your mineral balance, and your overall physiological state.
If the system is running well, your body reads that information clearly. It knows how to break things down, how to absorb nutrients, and how to maintain stability.
But if digestion is off, if minerals are depleted, or if buffering systems are strained, that same input doesn’t get processed the way it should.
It doesn’t always mean the food is the problem. Sometimes it means the system reading it needs support.
This is why two people can eat the same foods and have completely different outcomes. It’s not just about what you’re eating, it’s about how your body is able to interpret and respond to it.
Calcium in Nutrition
Calcium in food exists within a complex matrix. It’s not just about how much calcium is present, but what surrounds it and how the body interacts with it.
Dairy products such as milk, cheese, and yogurt provide concentrated calcium, often in forms that support structural needs. When digestion is strong, these can be highly effective. However, their absorption is still dependent on stomach acid and overall digestive function.
Leafy greens like kale, bok choy, and collard greens provide calcium alongside compounds that enhance absorption. These foods also bring in magnesium and other cofactors that help regulate how calcium is used in the body.
Cruciferous vegetables and plant foods provide calcium in smaller amounts, but often in more bioavailable forms when paired with the right digestive environment. This highlights that absorption is just as important as intake.
Fermented foods, including kefir, yogurt, sauerkraut, and other cultured vegetables, play a unique role. Fermentation breaks down compounds that inhibit mineral absorption and produces organic acids that make calcium easier to utilize. These foods can significantly improve how efficiently the body accesses minerals.
Bone broth and slow cooked meats provide calcium alongside phosphorus, collagen, and amino acids. This combination supports not only bone, but connective tissue, joints, and overall structural integrity.
Nuts and seeds, particularly almonds, sesame seeds, and chia seeds, contribute additional calcium along with healthy fats and trace minerals. While not as concentrated, they support the broader mineral network and help maintain balance over time.
It’s also important to recognize what can interfere with calcium absorption. High intake of highly processed foods, chronic stress, digestive dysfunction, and imbalances in other minerals can all reduce how effectively calcium is used, regardless of how much is consumed.
Ultimately, nutrition isn’t just about adding calcium. It’s about creating an internal environment where the body can read the information, absorb what it needs, and use it appropriately.
The Bigger Picture
Calcium doesn’t function in isolation. It depends on a network of nutrients and physiological conditions.
Vitamin D supports absorption. Magnesium helps regulate calcium movement and prevents improper deposition. Vitamin K2 helps direct calcium into bone rather than soft tissue. Protein provides the structural framework that calcium integrates into.
When these systems are supported together, calcium becomes effective. When they aren’t, the body adapts and compensates.
Conclusion
pH is a reflection of how the body is functioning, not just chemically, but systemically. It shows how the body is adapting, compensating, and maintaining balance under changing conditions.
Calcium plays a central role in this process, acting as both a structural and regulatory mineral. Its effectiveness depends on form, availability, and the body’s ability to use it.
When these systems are supported, the body does what it’s designed to do. It regulates, it adapts, and it heals.
pH and Nutrient Assimilation Chart
Message from Dr. Stottsberry
If you’ve made it this far, I want you to pause for a moment and just take a breath with me. This conversation about pH, calcium, and how your body regulates itself isn’t meant to overwhelm you, it’s meant to shift the way you see what your body is doing. Your numbers aren’t random, your symptoms aren’t coming out of nowhere, and your body isn’t confused or working against you. It’s responding. It’s responding to what it’s been given, what it’s been missing, and what it’s been trying to manage for longer than you probably realize.
When I talk about pH, I’m not talking about chasing a perfect number or forcing your body into some ideal state. I’m looking at patterns. I’m looking at how your body is handling digestion, minerals, stress, and energy on a day to day basis, and whether it’s moving with ease or working harder than it should have to. Calcium plays a much bigger role in that than most people realize. It isn’t just something stored in your bones, it’s actively involved in keeping your body stable. It steps in to buffer, to protect, and to maintain order when things begin to shift.
But here’s another way to look at it that often makes things click for people. The food you’re eating isn’t just fuel, it’s information. Every meal is a set of signals your body has to read, interpret, and respond to. Your body is constantly processing that information, deciding what to use, what to store, and what to eliminate.
And just like a computer, it needs the right software to process that information correctly.
If the system is running smoothly, it reads that input clearly. It knows what to do with it. It stays stable, efficient, and adaptable. But if something in the system is off, if digestion isn’t strong, if minerals are depleted, if the buffering systems are strained, then that same input doesn’t get processed the way it should.
It doesn’t mean the input is always wrong. Sometimes it means the system reading it needs support.
That’s where I focus my work. I’m not just looking at what you’re putting into your body, I’m looking at how your body is processing it. We look at digestion so you can actually break things down. We look at minerals so your body can buffer and stabilize. We look at patterns so we’re not guessing, we’re responding to what’s actually happening in real time.
Because your body already knows how to regulate. It hasn’t forgotten how to find balance. It’s simply been working with the inputs and conditions it’s had.
And when those change, when you give it better information and the tools it needs to process it, things begin to shift. Not all at once and not perfectly, but steadily, in a way that builds over time.
That’s where real healing begins.
Frequently Asked Questions (FAQ)
What is the ideal pH for the body?
Within the RBTI framework, a pH of approximately 6.3–6.4 in both urine and saliva is considered the point where the body is functioning most efficiently. This range is associated with optimal mineral utilization, balanced digestion, and stable metabolic activity. It’s not about hitting a perfect number every time, but about understanding patterns and trends.
Why does pH matter for mineral absorption?
pH directly affects how well your body can accept and use minerals. Each mineral has a range where it’s most available. If pH is too low or too high, absorption becomes less efficient, meaning even if you’re consuming the right nutrients, your body may not be able to fully utilize them.
What does it mean if my pH is too acidic?
A more acidic reading may indicate that the body is under increased metabolic demand or stress. This can be associated with faster breakdown, higher energy use, and potential depletion of mineral reserves over time if not supported properly.
What does it mean if my pH is too alkaline?
A more alkaline reading can suggest that the body is moving more slowly. Digestion may be underactive, and nutrients may not be breaking down or absorbing as efficiently. In this state, the body may appear “calm” but is often less effective at processing what it’s given.
Why are both urine and saliva tested?
Urine reflects what the body is eliminating, while saliva reflects broader systemic balance. Looking at both together provides a more complete picture of how the body is regulating and whether it’s in balance or compensating.
How does calcium relate to pH?
Calcium plays a key role in buffering the body. When pH shifts, calcium helps stabilize the environment so essential processes can continue. However, if the body is constantly relying on calcium to buffer without proper replenishment, it may begin pulling from its own reserves.
Are all forms of calcium the same?
No. Different forms of calcium behave differently in the body. Some are more structural, some are more bioavailable, and others help regulate or buffer pH more effectively. The form matters just as much as the amount.
Can I fix my pH just by changing my diet?
Diet plays a major role, but it’s only part of the picture. Your body still needs the ability to digest, absorb, and processwhat you’re eating. If those systems aren’t functioning well, simply changing food intake may not be enough.
Why can two people eat the same foods but have different results?
Because food is information, and the body needs the right “software” to process that information. Digestion, enzymes, mineral balance, and overall physiological state all influence how that input is interpreted and used.
Is pH testing diagnostic?
No. pH testing is a functional tool, not a diagnostic one. It provides insight into patterns and trends within the body, but it should always be interpreted alongside symptoms, history, and other clinical information.
How often should pH be tested?
Frequency depends on the individual and the purpose of testing. Some people track daily to observe patterns, while others use it periodically for insight. Consistency in timing and conditions is key for meaningful interpretation.
What is the goal when working with pH and minerals?
The goal isn’t to chase numbers. It’s to support the body so it can regulate more efficiently. When the body has the right inputs and support, balance becomes something it naturally returns to.
Comments