Final answer:
The primary source of energy for the human body is carbohydrates. While proteins, fatty acids, and lipids also provide energy, they are not the primary sources.
Step-by-step explanation:
The primary source of energy for the human body is carbohydrates. Carbohydrates are broken down into glucose, which is used by cells to produce energy through a process called cellular respiration. Glucose is easily accessible and quickly converted into energy, making it the preferred source of fuel for the body.
While proteins, fatty acids, and lipids also provide energy, they are not the primary sources. Proteins are primarily used for building and repairing tissues, while fatty acids and lipids are important for functions like insulation and hormone production. However, in situations where the body doesn't have sufficient carbohydrates, it can utilize proteins and lipids for energy through processes like gluconeogenesis and ketosis.
In summary, carbohydrates are the primary source of energy for the human body, specifically in the form of glucose.
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