By Jennifer Whitmire, MS, MEd, MH, CHES, NEP

I remember thinking something wasn’t right, even though everything looked “fine.” Nothing stood out on my labs, nothing was flagged, and there weren’t any answers for how I was feeling. I didn’t feel “fine.” I was more tired than I should have been based on how I was eating and taking care of myself. It just didn’t add up, and when you can’t explain something, it’s easy to start second-guessing yourself.

This is something I see all the time now with my own clients. They feel off, but their labs don’t give them answers. One of the things that gets missed is anemia. When we hear anemia, we usually think about iron. What most doctors miss, though, is looking at labs to see how the body is actually making and maintaining healthy red blood cells.

It’s Not Always About Iron

Most people think anemia just means low iron. That’s what I thought, too.

Anemia reflects how well your body is producing red blood cells and how effectively they function. Red blood cells are made in the bone marrow and carry oxygen throughout the body. That oxygen is what fuels your brain, your muscles, your metabolism, and everything else. When that system isn’t working well, the body feels it just enough that you notice something is off.

Iron is part of that process, because it helps form hemoglobin which carries oxygen, but iron doesn’t work alone. The body also needs vitamin B12, folate, vitamin B6, amino acids, vitamin C, and good digestion to build those cells correctly.

If one piece is missing, the whole process slows down.

For those who want to understand this a little more deeply, it helps to look at what’s actually happening beneath the surface. When we zoom in on how red blood cells are made and used, we start to see why anemia isn’t always as simple as it sounds.

A Closer Look at Anemia: What’s Happening Beneath the Surface

When we look more closely at anemia, we’re really looking at a breakdown somewhere along the red blood cell lifecycle. Red blood cells are produced in the bone marrow through a process called erythropoiesis which depends on a steady supply of key nutrients, proper signaling from hormones like erythropoietin, and a healthy internal environment that supports cell development.

Iron gets the most attention, but it is only one piece of a larger system. Iron must be absorbed in the gut, transported in the bloodstream bound to transferrin, stored primarily as ferritin, and then incorporated into hemoglobin. Each of these steps can be disrupted independently. A person can have adequate iron intake but still experience functional deficiency if absorption is impaired, if inflammation is present, or if iron is not being properly mobilized from storage.

Vitamin B12 and folate play a different role. They are essential for DNA synthesis during red blood cell formation. When either is insufficient, the body produces fewer red blood cells, and the ones that are produced tend to be larger and less efficient. This is why B12 and folate deficiencies are associated with what is classified as megaloblastic anemia.

Chronic inflammation adds another layer. Inflammatory signaling can increase levels of hepcidin, a regulatory hormone that reduces iron absorption and traps iron in storage sites. This is referred to as anemia of chronic disease or anemia of inflammation. In this case, iron may be present, but it is not readily available for use.

From a laboratory perspective, this is why looking at a single marker like hemoglobin doesn’t give the full story. A more complete picture includes ferritin, serum iron, total iron-binding capacity, transferrin saturation, B12, folate, and markers of inflammation. Patterns across these markers tesla us more than a single value.

What becomes clear when you step back is that anemia is not just what you are taking in through food or losing through blood loss. It tells us about absorption, transport, storage, use, and the overall internal environment. Supporting the body means looking at all of these layers.

When you look at anemia this way, it becomes clear that creating the conditions that allow all of these systems to work together is important. This is where a whole food, plant-based approach becomes especially valuable.

How This Applies to Whole Food Plant-Based Eating

One of the most common concerns around plant-based eating is whether it provides enough iron or B12 to prevent anemia. That question makes sense, but it oversimplifies what’s actually happening in the body.

As we’ve seen, anemia is not just intake. It involves absorption, transport, storage, and use. A whole food plant-based diet supports many of these processes when it is done intentionally.

Plant foods provide non-heme iron, which is absorbed differently than iron from animal products. While it is less concentrated, absorption can be enhanced by pairing iron-rich foods with vitamin C–rich foods. Meals that include lentils, leafy greens, beans, and seeds with citrus, peppers, or tomatoes support this process.

A naturally, fiber-rich, plant-based diet supports the gut microbiome which has a direct role in nutrient absorption. When digestion is functioning well, the body is better able to extract and use the nutrients available.

Vitamin B12 is one area that does require attention. It is not reliably supplied through plant foods. This is where supplementation or fortified foods become a practical and necessary part of a well-planned plant-based approach. (And for ALL diets for anyone over the age of 50).

It’s also important to consider inflammation. Diets centered around whole plant foods tend to be lower in inflammatory triggers which may support better iron regulation over time by reducing the signals that interfere with iron availability.

When you look at the full picture, a whole food plant-based way of eating can support the systems involved in preventing anemia, but it works best when it is thoughtful, balanced, and consistent.

Why You Do You Still Feel Off

Someone can be eating well, taking supplements, and not feel any different. That’s usually the point where people get frustrated, because it feels like nothing is working.

What I see more often is that the issue isn’t just what someone is eating, it’s what their body is able to absorb and actually use. Intake can be fine, but if it’s not being broken down and absorbed where needed, it’s not helping.

Low stomach acid, stomach issues, medications, and chronic stress all affect absorption. Even if nutrients are coming in, they may not be getting where they need to go. That’s why this doesn’t always show up clearly on basic labs right away.

The B12 Piece That Gets Missed

Vitamin B12 is one of the biggest gaps I see. It’s critical for red blood cell formation, but it also affects energy, brain function, and the nervous system. When B12 is low, people feel off in a way that’s hard to explain.

The tricky part is that B12 is difficult to absorb. It requires stomach acid and something called intrinsic factor, both of which tend to decline with age, stress, and certain medications. Even if someone is getting B12 in their diet, their body may not be using it well. When that happens, symptoms can show up, before anything abnormal on labs.

Folate and B6 Matter More Than You Think

Folate and vitamin B6 don’t get talked about as much, but they are just as important in this process. Folate is needed for proper cell division and DNA production which is essential for forming red blood cells. 

Vitamin B6 helps bind oxygen to hemoglobin and supports neurotransmitters which affects both energy and mood. When these nutrients are low, or not being used properly, things don’t stop completely, they just become less efficient. That’s when people start to feel that gradual decline in energy.

A Better Question to Ask

Instead of asking, “Do I need more iron?” a better question is: Can my body actually build healthy blood right now?

That depends on a lot more than one number on a lab test. It depends on digestion, nutrient intake, absorption, inflammation, and overall stress.

When those things are off, the body has to work harder to do something that should be automatic.

Where Food Actually Helps

This is why I always come back to food first. Food is a quick fix, and it provides the combination the body actually needs to do this well.

When you’re eating a variety of whole foods like leafy greens, legumes (beans and lentils), seeds, vegetables, and fruits, you’re getting iron along with vitamin C to help absorb it, B vitamins to support red blood cell formation, and the fiber that supports gut health.

This combination and synergy makes a bugger different than any single nutrient.

What This Looks Like Day to Day

This looks like simple meals created from real food.

• Greens with beans and a salad with seeds on top.
• Cooked vegetables with lentils and a side salad.
• A smoothie with greens, berries, and seeds.

Just consistently eating real, whole foods.

If You’ve Been Told “Everything Is Fine”

If you’ve been feeling off and haven’t been able to explain why, it’s worth looking beyond the surface. Anemia doesn’t only involve iron, and it’s not just something flagged on a lab. How is your body feeling? How is it actually functioning?

Your body is always giving feedback even when it doesn’t show up the way you expect.

If you’re looking for more simple, whole food plant-based meals like this, you can follow along for recipes, tips, and everyday ways to support steady energy and digestion.