Final answer:
Lipomas are benign tumors made up of adipose tissue consisting of adipocytes that store fat. The distribution of these fat stores in the body is influenced by hormones and genetics and can change with age. The BMI is often used as a measure of body fat but has its limitations.
Step-by-step explanation:
Lipomas are benign tumors composed of adipose tissue. They are usually found in the subcutaneous tissue under the skin but can also develop in other tissues and organs. These growths consist of fat-storing cells known as adipocytes. Adipocytes store lipids primarily as triglycerides, which are used for energy via a metabolic process called B-oxidation. In the body, half of the excess fat is stored in these adipocytes within the hypodermis. The hypodermis plays a crucial role in storing fats, which serve as an energy reserve, help in insulating the body to prevent heat loss, and act as a cushion to protect underlying structures from trauma.
There are two types of adipocytes: white and brown. Brown adipocytes store lipids as multiple droplets and have a high metabolic activity, whereas white adipocytes store lipids as a single large droplet and are less metabolically active. The number and type of adipocytes depend on the tissue and location and vary among individuals.
The distribution of fat in the body can be influenced by hormones such as testosterone, estrogen, insulin, and leptin, as well as genetic factors. Over time, as our bodies mature and age, the way fat is distributed changes. Additionally, the body mass index (BMI), which is a mathematical formula comparing body weight to height, is often used as a measure of fat, though it has limitations, especially in individuals who are physically fit.