Understanding Bioavailability: The Key to Unlocking Nutritional Potential

Understanding Bioavailability: The Key to Unlocking Nutritional Potential


Nutrition is a vital aspect of maintaining a healthy body and mind. We often hear about the importance of consuming a balanced diet rich in essential nutrients like vitamins, minerals, and macronutrients. But have you ever wondered why some foods are considered more nutritious than others? The answer lies in a concept called "bioavailability." In this article, we will delve into what bioavailability is, its relation to nutrition, and why it plays a crucial role in our overall well-being. We'll also explore some examples of foods that are highly compatible with the human body, maximizing the nutrients we receive.

What is Bioavailability?

Bioavailability refers to the proportion of a nutrient that is absorbed and utilized by the body after consumption. In simpler terms, it's the measure of how much of a nutrient in a particular food can be effectively used by your body. This concept is essential because it can significantly impact the nutritional value of the foods we eat.

The Relationship Between Bioavailability and Nutrition

Nutrient Absorption: 

The bioavailability of nutrients is closely linked to how well our bodies can absorb and utilize them. Some nutrients are more readily absorbed from certain foods, while others may require specific conditions or co-factors to enhance their absorption.

Nutrient Interactions: 

Certain nutrients can enhance or inhibit the absorption of others. For instance, vitamin C can enhance the absorption of non-heme iron (found in plant-based foods), while calcium can inhibit the absorption of iron if consumed in excess with iron-rich foods.

Food Processing: 

The way a food is prepared and processed can impact its bioavailability. Cooking, for example, can break down cell walls and make nutrients more accessible for absorption.

Individual Variability: 

Bioavailability can vary from person to person due to genetics, age, and health conditions. Some individuals may have a better ability to absorb certain nutrients than others.

Importance of Bioavailability in Nutrition

Understanding the bioavailability of nutrients is crucial for several reasons:

Maximizing Nutrient Uptake: 

Consuming foods with high bioavailability ensures that your body can efficiently utilize the nutrients they contain, leading to improved health and vitality.

Preventing Nutrient Deficiencies: 

Low bioavailability can lead to nutrient deficiencies, even if you're consuming a supposedly nutrient-rich diet. This can result in various health issues and compromised immune function.

Nutrient Pairing: 

Knowing which nutrients enhance or inhibit each other's absorption can help you make informed dietary choices. For example, pairing vitamin C-rich foods with plant-based iron sources can improve iron absorption.

Foods with High Bioavailability

Now that we understand the importance of bioavailability, let's explore some examples of foods that are highly compatible with the human body, making them excellent choices for optimising nutrient absorption:


Beef is exceptionally rich in bioavailable nutrients, including iron, vitamin A, vitamin B12, and various minerals. It is often recommended for those with iron-deficiency anemia.


Oysters are an excellent source of bioavailable zinc, which is essential for immune function, wound healing, and overall health. They also provide a good amount of vitamin B12.


Fatty fish like salmon are rich in omega-3 fatty acids, which are readily absorbed by the body. These fats are beneficial for heart and brain health.


Eggs are a source of highly bioavailable protein, along with essential nutrients like choline, biotin, and various vitamins and minerals. The protein in eggs is often used as a reference point for assessing the quality of other protein sources.

Bone Broth: 

Bone broth contains easily absorbable minerals like calcium, magnesium, and phosphorus. It's also a source of collagen, which may have benefits for joint and skin health.


Lean cuts of chicken provide high-quality protein that's well-absorbed by the body. It's also a source of niacin and other B vitamins.

Dairy Products: 

Dairy foods, such as milk, cheese, and yogurt, are rich in calcium and vitamin D, which are important for bone health. They also provide easily digestible protein.


Similar to chicken, turkey is a lean source of protein and contains various vitamins and minerals that are easily absorbed by the body.


Sardines are rich in omega-3 fatty acids, calcium, and vitamin D, making them a nutrient-dense and bioavailable seafood choice.

Foods with lower bioavailability

Foods with low bioavailability are those that contain nutrients that are not as easily absorbed or utilized by the body. Here are some examples:

Spinach and Other Leafy Greens: 

Spinach and other leafy greens contain oxalates, which can bind to calcium, reducing its absorption. This means that the calcium in spinach is not as bioavailable as calcium from other sources.

Whole Grains: 

Whole grains contain phytic acid, which can inhibit the absorption of minerals like zinc, iron, and calcium. So, the minerals in whole grains have lower bioavailability compared to processed grains.


Legumes, such as beans and lentils, contain compounds like phytates and tannins, which can reduce the absorption of minerals like iron and zinc.

Calcium-Fortified Foods: 

Some calcium-fortified foods may contain forms of calcium that are not as easily absorbed by the body as calcium from dairy products.


Tea contains tannins and polyphenols that can inhibit the absorption of non-heme iron, which is the type of iron found in plant-based foods. Drinking tea with iron-rich meals can lower the bioavailability of the iron.

Soy Products: 

Soybeans and soy products contain compounds called phytates and trypsin inhibitors that can reduce the absorption of minerals like iron and zinc.

Nuts and Seeds: 

Nuts and seeds contain phytic acid, which can inhibit the absorption of minerals. Soaking or roasting them can help reduce the impact on bioavailability.

It’s important to note that this does not mean the foods listed above are “bad” for us, we just need to be mindful that having them as the central component of our diet may not produce the best results for our health. 

Key Points

Bioavailability is a key factor in understanding the nutritional value of the foods we eat. Making informed choices about the foods we consume can lead to better nutrient absorption, reduced risk of deficiencies, and improved overall health. By incorporating foods with high bioavailability into our diets, we can harness the full potential of the nutrients they offer, ultimately promoting our well-being and vitality.

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