Question

In the United States, ingestion of which macronutrient has changed the most during the past 40 years?

a Protein
b All have increased similarly, as total kcal intake has increased
c Carbohydrate

Answer 1

Carbohydrate intake has changed the most in the past 40 years in the U.S., with carbohydrates serving as an essential energy source, despite their reputation for contributing to weight gain.

Step-by-step explanation:

In the United States, the ingestion of carbohydrates has changed the most during the past 40 years. Carbohydrates, often viewed negatively due to their association with weight gain when consumed in excess, are actually essential for biological functions.

They are a primary source of energy, particularly through glucose, which is vital for ATP production in cells. These macronutrients take the form of either complex carbohydrates, like starch and glycogen, or simple sugars like glucose and fructose.

Furthermore, nutritional labels indicate that both proteins and carbohydrates provide about 4 Calories per gram, while fats provide about 9 Calories per gram, showcasing their energy contributions to the body's daily needs.