Final answer:
In diabetes mellitus, carbohydrates should be restricted in the diet, and protein intake can be increased to meet energy requirements.
Step-by-step explanation:
In diabetes mellitus patients, the blood glucose level should be kept under control, for which the carbohydrates should be restricted in the diet. The energy requirements can be met with proteins and to a little extent by fats. However, as human beings primarily crave sweet foods, diabetic individuals can be supplied with non-carbohydrate sweeteners as a substitute.