NANP Board Practice Exam

Which type of fatty acids are characterized by having 2-3 carbons?

1. LCFA

2. MCFA

3. SCFA

4. VSCFA

The correct answer is: VSCFA

The type of fatty acids characterized by having 2-3 carbon atoms is very short-chain fatty acids (VSCFA). These fatty acids, generally defined as having fewer than 4 carbons, play significant roles in various metabolic processes and contribute to gut health. VSCFA are often produced through the fermentation of dietary fibers by gut microbiota, and examples include acetate, propionate, and butyrate. These compounds can serve as an energy source for colon cells and have been linked to various health benefits, including anti-inflammatory effects. Short-chain fatty acids (SCFA), while similar, specifically refer to fatty acids with 4-6 carbon atoms and are distinct from VSCFA. Medium-chain fatty acids (MCFA) have 6-12 carbon atoms, while long-chain fatty acids (LCFA) have more than 12 carbon atoms. Thus, the unique classification of VSCFA is essential to understand when discussing the various types of fatty acids based on their carbon chain length.