One Surprising Question
Imagine you stopped consuming vitamin C today.
How long do you think your body could cope?
Not a day. Not a week. For most healthy adults, it would take one to three months before the body's vitamin C stores become sufficiently depleted for symptoms of deficiency to appear. At first, you probably wouldn't notice very much. Over time, however, your body may become less efficient at repairing itself, and in extreme cases the classic deficiency disease scurvy can develop. Fortunately, that's now exceedingly rare in most developed countries—and sailors are generally much better fed than they used to be.
Now imagine you stopped consuming vitamin B12.
The answer is completely different.
Thanks to large stores in the liver, it may take two to five years before deficiency develops. Only then might problems such as fatigue, anaemia or tingling sensations start to appear. Vitamin B12 deficiency is relatively uncommon in healthy adults eating a varied diet. However, it becomes much more common in older adults, people with certain gastrointestinal disorders, and those following a vegan diet without an adequate source of vitamin B12.
How can one vitamin last only a few months, while another lasts for years?
The answer reveals one of the body's smartest survival strategies—and one of the foundations of orthomolecular nutrition.
The Science
In the previous lesson, we asked a simple question: What does the human body actually need? Science answers that question through biochemistry. Every second, your body performs millions of chemical reactions. It repairs tissues, builds proteins, produces hormones, generates energy and replaces ageing cells. To accomplish all of this, it requires a continuous supply of specific molecules. Fortunately, your body is an extraordinary chemical factory. It can manufacture cholesterol, produce glucose when needed and synthesise many compounds essential for life. But it cannot make everything.
Some nutrients simply have to come from food. These are called essential nutrients. They include vitamins, minerals, essential amino acids, essential fatty acids and water.
ORTHONIA Quick Fact. Essential nutrients fall into five major groups:
- Water (still spectacularly underrated).
- Vitamins (A, C, D, E, K, and the B vitamins: B1, B2, B3, B5, B6, B7, B9 and B12).
- Minerals (calcium, phosphorus, magnesium, sodium, potassium, chloride, iron, zinc, copper, iodine, selenium, manganese, molybdenum—and a few others that scientists still enjoy debating over coffee).
- Essential amino acids—the building blocks of proteins (histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine).
- Essential fatty acids (omega-6 linoleic acid and omega-3 alpha-linolenic acid—the two fats your body insists on outsourcing).
Feeling slightly overwhelmed? Don't worry—that's exactly why this course has 100 lessons rather than one. Over the coming weeks, we'll meet each of these nutrients one by one, discover what they actually do, where to find them, and—perhaps most importantly—why your body refuses to compromise without them.
If some nutrients depend on our diet, how does the body cope when food is temporarily unavailable? The answer lies in one of its most remarkable survival strategies. To cope with temporary shortages, the body has developed an impressive buffering capacity. Many nutrients are stored, creating biological reserves that can be used when intake temporarily falls short.
Think of these reserves as savings accounts. Some are generous. Vitamin B12 can often be stored for years. Others are much smaller. Vitamin C reserves may last only a few months.
ORTHONIA Quick Fact. How long can your body rely on its reserves?
Essential nutrient Approximate body reserve* Water Days Sodium Hours to days† Vitamin B1 (Thiamine) 2–3 weeks Vitamin C 1–3 months Folate (Vitamin B9) 2–4 months Vitamin D Several months Vitamin A Months to years Iron Months to years‡ Calcium Years (primarily stored in bone) Magnesium Years (primarily stored in bone) Vitamin B12 2–5 years Unlike vitamins and minerals that can be stored, water and electrolytes are continuously regulated and therefore require regular replenishment.
* Approximate values for healthy adults. The time before deficiency develops depends on age, physiological requirements, dietary intake, absorption, health status and existing body stores.
† Sodium balance is tightly regulated and depends strongly on sweating, hydration and kidney function.
‡ Iron stores vary considerably between individuals and are generally lower in menstruating women than in men or postmenopausal women.
This buffering system is why nutritional deficiencies usually develop gradually rather than overnight.
Scientists therefore distinguish between relative deficiencies—where nutrient availability is no longer ideal for optimal function—and absolute deficiencies, where body stores become so depleted that classical deficiency diseases develop.
Most of us don't worry about developing scurvy. Yet many people wonder why they feel tired by the end of winter, recover slowly after exercise or struggle to meet the demands of a busy life. Those complaints have many possible causes, and nutrition is certainly not always the answer. But they do raise an interesting question: Could our bodies benefit from more than simply "enough" nutrients?
Think of it this way. There is a difference between having enough fuel to keep a car running...
...and having enough to drive across Europe. The same may be true for nutrition. Avoiding deficiency is one goal. Supporting optimal physiology may be another.
A good example is vitamin D.
The recommended daily intake is designed to prevent deficiency in almost all healthy people. Some researchers, however, argue that higher intakes may be beneficial for certain individuals, particularly those at increased risk of deficiency or with limited sun exposure. Not all scientific organisations agree on exactly where that optimum lies. This illustrates an important principle: Preventing deficiency and achieving optimal nutrition are not always the same question.
Throughout this course, we'll explore where scientific consensus exists, where uncertainty remains, and why both are part of good nutritional science.
What Does This Mean for You?
One of the biggest misconceptions about nutrition is that deficiencies are all-or-nothing.
Long before a severe deficiency disease develops, nutrient stores may already be declining. The body compensates. It adapts. It quietly draws on its reserves. That is exactly what those reserves are designed to do. But they are not infinite.
Example. Take vitamin D (again).
If you live in Northern Europe, spend most of your day indoors and rarely eat oily fish, there is a reasonable chance that your vitamin D status is lower than ideal—especially by the end of winter.
But here's the tricky part. Vitamin D deficiency rarely comes with a flashing warning light. Some people experience fatigue, muscle weakness or bone discomfort. Others notice nothing at all. Those symptoms are also common in many other conditions, which means they cannot be used to diagnose a vitamin D deficiency.
The only reliable way to determine your vitamin D status is through a blood test, interpreted in the context of your age, lifestyle, medical history and current recommendations.
In other words, symptoms can raise suspicion. They cannot confirm a deficiency.
Orthomolecular nutrition is therefore not about chasing diseases. It is about giving your body what it needs before shortages become problems, through an appropriate diet and lifestyle.
Three Practical Tips
1. Learn the Difference Between "Essential" and "Optional"
If a nutrient is essential, your body depends on an external supply. Every healthy dietary pattern should therefore provide it consistently.
2. Respect Your Body's Reserves
Your nutrient stores are designed to bridge temporary shortages—not years of inadequate nutrition.
3. Stop Thinking Meal by Meal
Your body doesn't judge yesterday's breakfast. It looks at what you've been eating over weeks and months. Instead of asking: "Was this meal healthy?" start asking: "Would I be happy if I ate like this most days?" That's a much better question.
Can't Wait for More? Here's a Head Start.
If you're the kind of person who always reads the last page of a book first, this section is for you.
So here's a tiny spoiler.
You don't need to understand every vitamin, mineral and biochemical pathway before making better food choices. In fact, you can start today by becoming curious about just one nutrient that is relevant to your life.
Spend most of your day indoors? Start with Vitamin D.
Vitamin D is one of the nutrients most commonly found at suboptimal levels in Europe. While sunlight is our main source, diet can also contribute. Try including oily fish such as salmon, mackerel or sardines once or twice a week, choose vitamin D-fortified foods when appropriate, and make a habit of spending some time outdoors whenever possible. If you belong to a higher-risk group or have concerns about your vitamin D status, discuss testing with your healthcare professional.
Exercising or spending time outdoors in hot weather? Learn about Electrolytes.
Sweating doesn't just mean losing water—it also means losing minerals, especially sodium. During prolonged exercise or very hot weather, focus on replacing both fluids and electrolytes. Drinking according to thirst, eating balanced meals and including naturally mineral-rich foods are usually sufficient for most people. During prolonged endurance exercise or heavy sweating, additional electrolyte replacement may be appropriate.
Following a Vegetarian or Vegan Diet? Explore Vitamin B12.
Vitamin B12 is naturally found almost exclusively in animal-derived foods. If you eat little or no animal products, don't leave this nutrient to chance. Learn which fortified foods contain vitamin B12 and, if necessary, discuss appropriate supplementation with your healthcare professional. This is one of the few nutrients where planning ahead makes a real difference.
Don't worry if these terms are unfamiliar. Over the coming weeks, we'll explore each of these nutrients in detail. For now, the goal isn't to become an expert. The goal is simply to start asking a new question: "What nutrients is my body getting today?"
What You Should Remember from this lesson
Your body is remarkably self-sufficient. But it is not completely self-sufficient.
Some nutrients can be made. Others must be supplied.
The sooner you start thinking about what your body needs—rather than waiting until something goes wrong—the stronger the foundation for lifelong health.
Scientific References
Institute of Medicine. Dietary Reference Intakes: The Essential Guide to Nutrient Requirements. National Academies Press.
EFSA Panel on Nutrition, Novel Foods and Food Allergens. Dietary Reference Values for Nutrients. European Food Safety Authority.
Cashman KD et al. Vitamin D deficiency in Europe: pandemic? American Journal of Clinical Nutrition. 2016;103(4):1033–1044.
Mozaffarian D, Rosenberg I, Uauy R. History of Modern Nutrition Science. BMJ. 2018;361.
Ross AC et al. Modern Nutrition in Health and Disease. 12th Edition.
Next Week
If we know which nutrients our bodies need...
Why are obesity, type 2 diabetes, cardiovascular disease and many other chronic diseases becoming more common than ever before?
Has our biology changed—or has our environment changed faster than our biology can keep up?
YOUR BUILDING BLOCKS
| Building Block | What You've Learned | In One Sentence |
|---|
| ✅ Lesson 1 The Forgotten Question of Nutrition | We shifted our perspective from asking "What should I avoid?" to asking "What does my body actually need?" We also discovered that food is more than fuel—it provides the molecules from which every cell is built. | Good nutrition begins with understanding what the body needs, not just what it should avoid. |
| ✅ Lesson 2 The Nutrients We Cannot Live Without | We learned that some nutrients can be made by the body, while others must come from food. We also discovered that the body has remarkable nutrient reserves, allowing some deficiencies to develop over weeks and others only after years. | Your body is an extraordinary chemical factory—but even the best factory depends on a continuous supply of essential raw materials. |