Scurvy

Scurvy, also known as scorbutus, is a serious deficiency disease. It occurs when a person does not get enough vitamin C, which is also called ascorbic acid. This vitamin is vital for many biological processes. It acts as an antioxidant to protect cells. It also helps the intestines absorb iron from food. Humans cannot make their own vitamin C. Our livers lack the enzyme L-gulonolactone oxidase (GULO) needed to synthesize it. Because of this, we must get it from our diet. Without enough vitamin C, the body's structural integrity begins to fail.

The mechanism of scurvy involves several complex chemical pathways. Vitamin C is a necessary cofactor for two specific enzymes. These are prolyl hydroxylase and lysyl hydroxylase. These enzymes perform hydroxylation on the amino acids proline and lysine. This process is required to create stable collagen. Collagen is a primary structural protein in the human body. It provides strength to skin, bones, cartilage, and blood vessels. When collagen is defective, blood vessels become fragile and leak. This leads to easy bruising and internal bleeding. Furthermore, a lack of vitamin C reduces the production of carnitine and catecholamines. These substances are needed to turn food into ATP, which is the body's main energy source. Low ATP levels lead to the fatigue and weakness seen in early stages.

Symptoms of scurvy progress through distinct stages as the deficiency worsens. Early signs include malaise, which is a general feeling of discomfort, and lethargy. Patients may also feel weakness or soreness in their arms and legs. After one to three months of deficiency, more severe symptoms appear. These include shortness of breath and bone pain. Myalgias, or muscle pain, can occur due to low carnitine. Skin changes follow, such as roughness, easy bruising, and petechiae. Petechiae are small red spots caused by bleeding under the skin. As the disease advances, gums become diseased and teeth may loosen. Poor wound healing is also a major sign. In the late stages, patients may face jaundice, fever, or convulsions. Without treatment, scurvy is invariably fatal due to infection or bleeding.

History shows that scurvy has affected humans for thousands of years. Descriptions of the disease exist from ancient Egypt around 1550 BC. The Greek physician Hippocrates described swelling of the spleen in his writings. During the Age of Sail, scurvy was a massive threat to explorers. Sailors on long voyages often lacked fresh produce. It was often assumed that 50 percent of a crew would die from scurvy on a major voyage. This was because they relied on limited, dry staples.

Even though some people, like the monk Faxian, suggested using ginger or sea kale, many tragedies continued. This happened because fresh fruits could not be stored easily on ships.

Prevention relies on consuming foods rich in ascorbic acid. Many fruits and vegetables are excellent sources. Camu Camu contains about 2000 mg of vitamin C per 100 grams. Amla has 610 mg, and red bell peppers have 200 mg. Other good sources include guava, blackcurrants, and broccoli. Citrus fruits like oranges and lemons provide about 53 mg per 100 grams. It is important to note that cooking can decrease the amount of vitamin C in food. Eating raw fruits and vegetables is often the best way to ensure intake. In extreme cases, medical professionals use vitamin C supplements. These can be taken by mouth or intravenously for the best results. Most people begin to feel better within a few days of treatment. Full recovery usually takes only a few weeks.

In the modern world, scurvy is much rarer than in the past. It is no longer a common threat to most adults in industrialized nations. However, it still occurs in specific groups. It is often found in neglected children, the elderly living alone, or people with mental disorders. It can also affect those with alcoholism or intestinal malabsorption. Scurvy is still widespread in the developing world due to malnutrition. Among refugees, reported rates of scurvy can be between 5 and 45 percent. This shows how much food security impacts human health.

Understanding scurvy connects us to the broader study of nutrition and biochemistry. It demonstrates how a single missing micronutrient can disrupt an entire system. The disease shows how specific enzymes drive the creation of essential proteins like collagen. It also highlights the history of maritime exploration and the challenges of long-distance travel. By studying scurvy, scientists learn more about how the body uses energy and maintains its structures. It remains a powerful example of why a balanced diet is necessary for life.