HomeAST CST Exam Prep 2026 TestQuestion 8 of 10
AST CSTQuestion 8 / 10

Several dietary and lifestyle factors can either increase or decrease lower esophageal sphincter (LES) pressure. All of the following factors can increase lower esophageal sphincter (LES) pressure, EXCEPT:

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✓ Correct answer: C. fat Dietary and lifestyle factors can have an impact on the pressure of the lower esophageal sphincter (LES). Some factors may increase LES pressure, while others may lower it. In this question, we are looking for the factor that does not increase LES pressure.<br/><br/>Option A) protein<br/>Protein is an essential nutrient that is found in foods such as meat, fish, poultry, dairy products, beans, and legumes. However, consuming protein-rich foods does not result in an increase in LES pressure. Protein is necessary for the growth and repair of tissues in the body and plays a role in various bodily functions, but it does not have a direct effect on LES pressure.<br/><br/>Option C) carbohydrates<br/>Carbohydrates are a major source of energy and are found in foods like bread, rice, pasta, fruits, and vegetables. Similar to protein, consuming carbohydrates does not increase LES pressure. Carbohydrates are broken down into sugars during digestion, but this does not have a direct impact on LES pressure.<br/><br/>Option D) nonfat milk<br/>Nonfat milk refers to milk that has had the fat content removed. While it is often recommended as a lower-fat alternative to whole milk, consuming nonfat milk does not increase LES pressure. However, it is important to note that milk, especially whole milk, can increase LES pressure in some individuals.

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