Deficiency Diseases and Disorders

Both vitamin B-12 and folate deficiencies impair DNA synthesis in red blood cells, leading to the formation of large, immature cells known as macrocytes. Biotin, vitamin C, and vitamin E deficiencies do not typically cause macrocytic anemia.

Hydrochloric acid (HCl) in the stomach is necessary to cleave vitamin B-12 from its bound food proteins, allowing it to bind to intrinsic factor for absorption. A reduction in HCl production, common in older adults, directly impairs this process and leads to vitamin B-12 malabsorption.

Pellagra is the classic deficiency disease of niacin, characterized by the four Ds: dermatitis, diarrhea, dementia, and death. Beriberi is caused by thiamin deficiency, scurvy by vitamin C deficiency, and rickets by vitamin D deficiency.

Thiamin (vitamin B1) deficiency leads to beriberi, which affects the cardiovascular and nervous systems. Pellagra is caused by niacin deficiency, rickets by vitamin D deficiency, and scurvy by vitamin C deficiency.

Kwashiorkor is a severe form of malnutrition caused by insufficient protein intake, characterized by bilateral edema, particularly a swollen or bulging abdomen (ascites). Marasmus, on the other hand, is caused by a severe deficiency of all macronutrients (calories) and is characterized by wasting without edema.

Vitamin K is essential for the synthesis of proteins required for blood coagulation. A deficiency in vitamin K impairs the clotting process, leading to excessive bleeding. Acidosis is unrelated to vitamin K levels, and a deficiency would prevent blood clots rather than cause them.

Calcium (Ca++) deficiency is one of the most common nutritional imbalances found in homemade pet diets, especially when meat is the primary ingredient without proper calcium supplementation, leading to metabolic bone disease.

Zinc is an essential micromineral required by every cell in the body, serving as a cofactor for hundreds of enzymatic reactions. It is crucial for immune function, protein synthesis, and wound healing.

Copper deficiency in ruminants leads to poor growth, reduced feed efficiency, and reproductive issues, along with characteristic signs like coat bleaching. Copper is vital for iron absorption, connective tissue synthesis, and enzyme function.

Selenium deficiency is well-known for causing muscle damage, such as white muscle disease in young livestock, alongside poor growth and impaired reproduction. Selenium acts as an antioxidant to protect muscle tissues from oxidative damage.

Manganese is essential for bone formation and cartilage development, so its deficiency leads to skeletal abnormalities like crooked calves or perosis in poultry. It also plays a key role in reproductive health and overall production efficiency.

Magnesium is the central atom of the chlorophyll molecule. Its deficiency leads to the breakdown of chlorophyll, resulting in chlorosis (yellowing of leaves).

Asthma is a long-term condition that requires ongoing management, fitting the definition of a chronic illness.

Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin in the blood, often caused by low iron levels.