Final answer:
Low-fat or nonfat milk is the best option for those on low-carb diets.
Step-by-step explanation:
The best milk to use for those on low-carb (sugar) diets would be low-fat or nonfat milk. These options contain the same amount of calcium and other essential nutrients as whole milk, but with much less fat and calories. Lactose-free and fortified soy beverage or rice beverage are also good alternatives to consider.