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Lactulose syrup are rich in calories and there will be 250 calories in 500 grams of it.
Whilst the syrup is high in calories, these calories cannot be absorbed by the human body. We lack the necessary enzymes to break down the sugar in our intestines into a form we can absorb.
This means that from lactulose we get a sweet taste but little or no energy; however, we can't use it properly as a sweetener because of its laxative effect.