Final answer:
Scientific evidence supports that carbohydrates are the primary source of energy for the body as they provide glucose that is converted to ATP, essential for cellular functions.
Step-by-step explanation:
The statement from the given options that is supported by scientific evidence is: Carbohydrates are the primary source of energy for the body. Carbohydrates are an essential component of the human diet, found in natural sources like grains, fruits, and vegetables. They provide energy to the body through glucose, which is a simple sugar derived from the digestion of starches and other carbohydrates. This glucose is then used by the body to produce ATP (Adenosine Triphosphate), which is essential for powering cellular activities. It's important to note that while excessive consumption of carbohydrates can lead to weight gain, not all carbohydrates are unhealthy, and they definitely have an impact on blood sugar levels.