Final answer:
For the sentence completion, 'less' is the correct option, as 'food' is uncountable. When it comes to weight loss, vegetables are the best type of food due to their low calorie and high fiber content.
Step-by-step explanation:
The correct answer to fill in the blank for the sentence 'We bought _ food this week' is 'less.' The word 'fewer' is used with countable nouns, while 'less' is used for uncountable nouns. Since 'food' cannot be counted in individual items but rather in quantity or mass, 'less' is the appropriate choice. Therefore, the sentence should read: 'We bought less food this week.'
Regarding the question of which type of food will help the most with weight loss, vegetables are generally considered the best option. They are low in calories and high in fiber, which helps you feel full and satisfied, leading to a lower overall calorie intake.