Fat has more than twice as many calories per gram as carbohydrates. A 1 gram of fat has about 9 calories, whereas a 1 gram of carbohydrate has about 5 calories.
Fats are the slowest energy source but is the most energy-efficient form of food. Fat is first converted into fatty acids and glycerol which then converted into glucose as energy. So the correct option is B.
The amount of energy in an item of drink or food is measured in calories. When person drink and eat more calories than the body use up, our bodies store the excess as body fat. If this continues, over time we may put on weight.
In other words, we could eat twice as much carbohydrates or proteins as fat for the same amount of calories.
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