Final answer:
The diabetic client understands the principles of their diet when they state 'I need to restrict my carbohydrate intake and avoid concentrated sweets.'
Step-by-step explanation:
The diabetic client understands the principles of their diet when they state 'I need to restrict my carbohydrate intake and avoid concentrated sweets.' Carbohydrates are the main nutrient that affects blood glucose levels, so it is crucial for diabetics to control their carbohydrate intake. Restricting carbohydrate intake and avoiding concentrated sweets helps to maintain stable blood glucose levels.