9 topics with a brief review: definitions, key facts, and classroom questions.
Welcome to the section dedicated to lipid metabolism pathology. Here we analyze how essential body fats become risk factors for severe diseases. We will study general lipid metabolism disorders and the mechanisms underlying lipodystrophies.
The focus is on modern concepts of obesity and atherosclerosis. We will break down appetite regulation, the endocrine function of adipose tissue (adipokines), and the hormonal mechanisms of obesity development. A dedicated block covers dyslipoproteinemias—the key to understanding vascular catastrophes.
What is most frequently asked in classes? Instructors will certainly demand knowledge of the pathogenesis of atherosclerosis and the Fredrickson classification of dyslipoproteinemias. Also, pay special attention to how leptin works and why adipose tissue is now considered a full-fledged endocrine organ. This knowledge is the foundation for your future internal medicine, cardiology, and endocrinology rotations.
What are the main classes of lipids identified in the body?
The main representatives include phospholipids, cholesterol, triglycerides, and steroids.
What are the degrees of obesity according to the body mass index?
Three degrees are distinguished: Grade I corresponds to a BMI of 25–29.9 (overweight), Grade II to a BMI of 30–39.9 (obesity), and Grade III is diagnosed at a BMI of 40 and above (morbid obesity).
Why doesn't leptin help lose weight in obesity?
In obesity, a decrease in hypothalamic sensitivity to leptin often develops. As a result, the "satiety signal" is not perceived, and the synthesis of neuropeptide Y, which stimulates hunger, is not suppressed.
Which thyroid hormones cause the hypothyroid variant of obesity?
Deficiency in the effects of iodine-containing thyroid hormones—T3 and T4.
What is the difference between wasting and cachexia?
Wasting is a fat deficit from 20% and BMI < 18.5. Cachexia is the extreme stage: loss of more than 50% of fat, BMI < 17, and pronounced loss of muscle and connective tissue.
Which genetic mutations cause primary lipodystrophies?
Primary familial forms are associated with an LMNA gene mutation (autosomal dominant). The congenital generalized form is caused by a mutation in the AGPAT2 gene on chromosome 9.
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