The passage that uses relevant, sufficient evidence to support the claim that the salad bar in the cafeteria is not offering truly healthy food is:
"The healthiest dressing still contains over 200 calories and 18 grams of fat per serving. The most popular topping, candied bacon, contains not only two grams of fat per serving but also the equivalent of a full teaspoon of sugar."
This passage directly addresses the nutritional content of items available at the salad bar, highlighting that even the healthiest options still contain significant calories and fat, which undermines the claim of offering truly healthy food.