Assertion (A) Diet induced thermogenesis is lower in diets that contain very high amount of fats.
Reason (R) The process of digestion, absorption and metabolism of fats utilises more energy compared to carbohydrates.

Question Explanation:
This question is about diet-induced thermogenesis (DIT), which is the energy your body uses to digest, absorb, and process the food you eat.
The assertion (A) says that DIT is lower when you eat a diet very high in fat.
The reason (R) says that digesting, absorbing, and metabolizing fats uses more energy than carbohydrates.

Let's break down why one statement might be true or false:
Reason (R): It's actually false. While fat does provide a lot of energy, your body uses less energy to process fat compared to carbohydrates and proteins.

Assertion (A): Because your body uses less energy processing fat, it means the diet-induced thermogenesis (DIT) is lower on high-fat diets, making the assertion (A) true.

Therefore, the correct answer is C: A is true and R is false.