Misc
The Elemental Composition of the Human Body
The Elemental Composition of a Human Body
The human body is a miraculous, well-oiled, and exceptionally complex machine. It requires a multitude of functioning parts to come together for a person to live a healthy life—and every biological detail in our bodies, from the mundane to the most magical, is driven by just 21 chemical elements.
Of the 118 elements on Earth, just 21 of them are found in the human body. Together, they make up the medley of divergent molecules that combine to form our DNA, cells, tissues, and organs.
Based on data presented by the International Commission on Radiological Protection (ICRP), in the above infographic, we have broken down a human body to its elemental composition and the percentages in which they exist.
These 21 elements can be categorized into three major blocks depending on the amount found in a human body, the main building block (4 elements), essential minerals (8 elements), and trace elements (9 elements).
The Elemental Four: Ingredients for Life
Four elements, namely, oxygen, carbon, hydrogen, and nitrogen, are considered the most essential elements found in our body.
Oxygen is the most abundant element in the human body, accounting for approximately 61% of a person’s mass. Given that around 60-70% of the body is water, it is no surprise that oxygen and hydrogen are two of the body’s most abundantly found chemical elements. Along with carbon and nitrogen, these elements combine for 96% of the body’s mass.
Here is a look at the composition of the four elements of life:
Element | Weight of Body Mass (kg) | Percentage of Body Mass (%) |
---|---|---|
Oxygen | 43 kg | 61.4% |
Carbon | 16 kg | 22.9% |
Hydrogen | 7.0 kg | 10.0% |
Nitrogen | 1.8 kg | 2.6% |
Values are for an average human body weighing 70 kg.
Let’s take a look at how each of these four chemical elements contributes to the thriving functionality of our body:
Oxygen
Oxygen plays a critical role in the body’s metabolism, respiration, and cellular oxygenation. Oxygen is also found in every significant organic molecule in the body, including proteins, carbohydrates, fats, and nucleic acids. It is a substantial component of everything from our cells and blood to our cerebral and spinal fluid.
Carbon
Carbon is the most crucial structural element and the reason we are known as carbon-based life forms. It is the basic building block required to form proteins, carbohydrates, and fats. Breaking carbon bonds in carbohydrates and proteins is our primary energy source.
Hydrogen
Hydrogen, the most abundantly found chemical element in the universe, is present in all bodily fluids, allowing the toxins and waste to be transported and eliminated. With the help of hydrogen, joints in our body remain lubricated and able to perform their functions. Hydrogen is also said to have anti-inflammatory and antioxidant properties, helping improve muscle function.
Nitrogen
An essential component of amino acids used to build peptides and proteins is nitrogen. It is also an integral component of the nucleic acids DNA and RNA, the chemical backbone of our genetic information and genealogy.
Essential and Supplemental Minerals
Essential minerals are important for your body to stay healthy. Your body uses minerals for several processes, including keeping your bones, muscles, heart, and brain working properly. Minerals also control beneficial enzyme and hormone production.
Minerals like calcium are a significant component of our bones and are required for bone growth and development, along with muscle contractions. Phosphorus contributes to bone and tooth strength and is vital to metabolizing energy.
Here is a look at the elemental composition of essential minerals:
Element | Weight of Body Mass (g) | Percentage of Body Mass (%) |
---|---|---|
Calcium | 1000 g | 1.43% |
Phosphorus | 780 g | 1.11% |
Potassium | 140 g | 0.20% |
Sulphur | 140 g | 0.20% |
Chlorine | 100 g | 0.14% |
Sodium | 95 g | 0.14% |
Magnesium | 19 g | 0.03% |
Iron | 4.2 g | 0.01% |
Values are for an average human body weighing 70 kg.
Other macro-minerals like magnesium, potassium, iron, and sodium are essential for cell-to-cell communications, like electric transmissions that generate nerve impulses or heart rhythms, and are necessary for maintaining thyroid and bone health.
Excessive deficiency of any of these minerals can cause various disorders in your body. Most humans receive these minerals as a part of their daily diet, including vegetables, meat, legumes, and fruits. In case of deficiencies, though, these minerals are also prescribed as supplements.
Biological Composition of Trace Elements
Trace elements or trace metals are small amounts of minerals found in living tissues. Some of them are known to be nutritionally essential, while others may be considered to be nonessential. They are usually in minimal quantities in our body and make up only 1% of our mass.
Paramount among these are trace elements such as zinc, copper, manganese, and fluorine. Zinc works as a first responder against infections and thereby improves infection resistance, while balancing the immune response.
Here is the distribution of trace elements in our body:
Element | Weight of Body Mass (mg) | Percentage of Body Mass (%) |
---|---|---|
Fluorine | 2600 mg | 0.00371% |
Zinc | 2300 mg | 0.00328% |
Copper | 72 mg | 0.00010% |
Iodine | 13 mg | 0.00002% |
Manganese | 12 mg | 0.00002% |
Molybdenum | 9.5 mg | 0.00001% |
Selenium | 8 mg | 0.00001% |
Chromium | 6.6 mg | 0.00001% |
Cobalt | 1.5 mg | 0.000002% |
Values are for an average human body weighing 70 kg.
Even though only it’s found in trace quantities, copper is instrumental in forming red blood cells and keeping nerve cells healthy. It also helps form collagen, a crucial part of bones and connective tissue.
Even with constant research and studies performed to thoroughly understand these trace elements’ uses and benefits, scientists and researchers are constantly making new discoveries.
For example, recent research shows that some of these trace elements could be used to cure and fight chronic and debilitating diseases ranging from ischemia to cancer, cardiovascular disease, and hypertension.
Misc
Visualizing the Opportunity Cost of Unrecycled Metals in the U.S.
Exploring the quantity and dollar value of recycled metals in the U.S. by visualizing metal recycling ratios.

The Opportunity Cost of Unrecycled Metals in the U.S.
Metals are an essential resource for modern society, used in everything from construction and transportation to technology and medical equipment. As the demand for these minerals continues to grow, so does the amount of waste generated by their production and consumption.
Recycling this metal waste is not just a win for sustainability; it also has huge economic benefits. In the visual above, we explore the ratio of recycled vs. unrecycled metals in the U.S. using 2020 Recycling Statistics by the U.S. Geological Survey.
Metal Recycling in the U.S.
Opportunity cost is a concept that refers to the benefits that are forgone when choosing one option over another. In the case of unrecycled metals, the opportunity cost is the potential economic and environmental benefits that could have been achieved through increasing metal recycling ratios.
Below are the recycling rates for select metals in the U.S. in 2020.
Metal | % of supply recycled |
---|---|
Aluminum | 54 |
Chromium | 25 |
Copper | 36 |
Iron & Steel | 52 |
Lead | 77 |
Magnesium | 55 |
Nickel | 52 |
Tin | 36 |
The above recycled metals represented a dollar value of $26 billion in 2020. Their unrecycled counterparts, on the other hand, represented $28 billion.
Metals can either be recycled from scrap that results from the manufacturing process (known as “new scrap”) or scrap from post-consumer products (“old scrap.”) Regardless of the source, many of them, especially chromium, copper, and tin, have the potential to reap further sustainability and economic benefits by recycling a larger proportion of their scrap supplies.
The Case for Metal Recycling
When compared with the mining, processing and transport of new metals, recycling metals can provide a significantly less energy-intensive alternative, saving enough energy each year to power millions of homes in the U.S.
Recycling metals can also save natural resources, create more green jobs, and reduce a country’s dependency on mineral imports by supplementing its supply of raw materials.
Overall, the potential for metal recycling is vast, and taking steps to increase the amount of recycled metals in the U.S. can lead to even greater sustainability and economic benefits.
Misc
Mapped: How the Energy Crisis Impacts Global Food Insecurity
Exploring global food insecurity through the lens of the energy crisis and rising food costs.

Mapped: How the Energy Crisis Impacts Global Food Insecurity
Food insecurity occurs when an individual does not have access to the adequate quantity or quality of food they require to meet their biological needs.
A disruption in supply chains, rising input costs, and inadequate weather can all have a direct impact on global food security, all of which have been in play in recent years.
Using data from the Food and Agriculture Organization (FAO) of the United Nations, let’s do a deep dive into food insecurity around the world and discuss how rising energy costs can drive up food prices, exacerbating food insecurity.
The State of Global Food Insecurity
The latest data from the FAO marks 29.3% of the entire world population to be moderately or severely food insecure, with 40% of this population experiencing severe food insecurity. Based on FAO definitions, here is what that means:
- A moderately food insecure person experiences uncertainty about their ability to obtain food, unwillingly compromising the quantity and/or the quality of food they consume
- A severely food insecure person lacks access to food, enduring prolonged periods of time without eating
The African continent bears most of the burden when it comes to global food insecurity, with 14 out of the top 15 most food-insecure countries being in this region. The data also paints a relatively grim picture for Middle Eastern and South American countries, while North America and Western Europe have moderate or severe food insecurity marked below 10%.
Country | Prevalence of moderate or severe food insecurity (3-year average, 2019-2021) |
---|---|
🇨🇬 Congo | 88.7% |
🇸🇱 Sierra Leone | 86.7% |
🇸🇸 South Sudan | 86.4% |
🇭🇹 Haiti | 82.5% |
🇨🇫 Central African Republic | 81.3% |
🇲🇼 Malawi | 81.3% |
🇱🇷 Liberia | 80.6% |
It’s difficult to pinpoint the prevalence of African food insecurity to just one cause. Climate change, conflict in Africa, government debt, and Russia’s invasion of Ukraine have all contributed in different ways to worsening food security conditions in this region.
The Russia-Ukraine conflict, for instance, led to European aid for African countries to drop substantially, while grain exports from both Ukraine and Russia fell as ports in the Black Sea experienced disruptions. The war has also caused a disruption in fertilizer supplies, with Russia being the top exporter of fertilizer, along with a substantial rise in farming input costs as energy prices soared in 2022.
How Energy Prices Trickle Down to Food Prices
Food prices have risen substantially in the last year due to surging energy prices and supply chain disruptions. The FAO food price index, which measures the change in international prices of a basket of food commodities, saw a 14.3% increase between 2021 and 2022.
Index | % change in price since 2021 |
---|---|
General Food Price Index | 14.3% |
Meat | 10.4% |
Dairy | 19.6% |
Cereals | 17.9% |
Vegetable oils | 13.9% |
Sugar | 4.7% |
As seen above, individual commodity indices followed this trend, with dairy and cereal prices bearing the brunt.
Energy costs trickle down to food prices in a variety of ways. The simple correlation between historic oil and corn prices, seen below, can paint a telling picture.
What’s interesting is that the International Monetary Fund (IMF) predicts that the effects of the 2022 energy cost crisis may not have even fully materialized yet.
According to their research, a 1% increase in fertilizer prices can boost food commodity prices by 0.45% within four quarters. With natural gas, a major input for nitrogen-based fertilizer, being 150% more expensive in 2022 than in 2021, this may be a cause for concern in the upcoming months.
Relatedly, a rise in fertilizer costs is also connected to harvest levels in upcoming seasons. Reduced use of fertilizer as a result of high costs can lead to diminished crop yields, and the IMF predicts that a 1% drop in global harvests bumps food commodity prices by 8.5%, potentially indicating that the worst of it for food prices—and for global food security—is still yet to come.
Looking Ahead to 2023
Food security is a fundamental aspect of human existence and plays an important role in the steady economic growth and prosperity of nations. While we may be tempted to believe that we’re heading in the right direction on a global scale, the FAO paints a different picture, specifically for Africa.
2030 predictions for global undernourishment forecast an 11.5% increase in hunger in Africa, while world hunger at large is predicted to decrease. With global inflation looming high and food prices still under the influence of 2022 events, addressing hunger in Africa is as crucial as ever to improve the overall well-being and development of the continent.
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