Sentence:  One <WSD>serve</WSD> of carbohydrates is approximately equal to a slice of bread, a piece of fruit, third of a cup of cooked rice, half a cup of grains, cereals, starchy vegetables or cooked pasta, 200 grams of plain yoghurt, or 300 millilitres of milk. 
Meaning of the word marked with <WSD> tags:  A portion of food or drink, a serving.