Which of the following transitions among metabolic macronutr

Which of the following transitions among metabolic macronutrients is a non-permitted transition? Protein to fatty acids; Fatty acids to carbohydrate; Carbohydrate to fatty acids; Protein to carbohydrate;

Solution

The non permitted transition is : Protein to fatty acids.

Fatty acids is formed from carbohydrates, and carbohydrate is also converted to fatty acids.

Carbohydrate is formed from protein in gluconeogenesis but protein to fatty acid transistion is not permitted.