The reason behind eating a large amount of eggs that are rich in phosphatidylcholine is a risk factor for cardiovascular diseases. Concept introduction: Trimethylamine N -oxide is a small colorless amine oxide that is generated from choline, betaine, and carnitine by gut microbial metabolism . The concentration of TMAO in the blood increases after consuming the food that contains carnitine or lecithin if the bacteria convert those substances to TMAO that are present in the gut.

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Chapter 20, Problem 27E

(a)

Summary Introduction

To explain: The reason behind eating a large amount of eggs that are rich in phosphatidylcholine is a risk factor for cardiovascular diseases.

Concept introduction: Trimethylamine N-oxide is a small colorless amine oxide that is generated from choline, betaine, and carnitine by gut microbial metabolism. The concentration of TMAO in the blood increases after consuming the food that contains carnitine or lecithin if the bacteria convert those substances to TMAO that are present in the gut.

(b)

Summary Introduction

To explain: Whether ingesting phosphatidylcholine slows down the aging process or not.

Concept introduction: Trimethylamine N-oxide is a small colorless amine oxide that is generated from choline, betaine, and carnitine by gut microbial metabolism. The concentration of TMAO in the blood increases after consuming the food that contains carnitine or lecithin if the bacteria convert those substances to TMAO that are present in the gut.

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