Is the following experiment deign randomized, blocked or matched?

Also, is is blind? or double blind?

Is diet or exercise effective in combatting insomnia? Some believe that cutting out desserts can help alleviate the problem, while others recommend exercise. Forty volunteers suffering from insomnia agreed to participate in a month-long test. Half were randomly assigned to a no-dessert diet; the others continued dessert as usual. Half of the people in each of these groups were randomly assigned to an exercise program, while the others did not exercise. Those who ate no dessert and engaged in exercise showed the most improvement.