Final answer:
Carbohydrates are a macronutrient composed of carbon, hydrogen, and oxygen that provide energy, especially glucose which is essential for brain function. They are found in many common foods and are categorized into monosaccharides, disaccharides, and polysaccharides.
Step-by-step explanation:
The true statements describing carbohydrates are:
- Carbohydrates are a macronutrient that provide energy to the body.
- Carbohydrates are made up of carbon, hydrogen, and oxygen atoms in a ratio of 1:2:1.
- Carbohydrates can be found in foods such as bread, pasta, and rice.
- Carbohydrates are the main source of energy for the brain.
Carbohydrates serve crucial roles in the human diet. They are classified into three subtypes: monosaccharides, disaccharides, and polysaccharides, with glucose being an example of a monosaccharide. Furthermore, one gram of carbohydrates provides 4 Calories of energy, and they are vital for both energy provision and various biochemical processes.