What does "diet" mean here?
Essentially, "diet" means a specific selection of foods. We usually tend to think of "diet" in the sense of restricting foods and food intake to lose weight, but that in itself is also a selection of sorts. When the speaker says "a diet of Salvinia," the selection of food (diet) referred to here is the Salvinia plant. Ex: I'm going to workout and eat a diet of salads and nuts only. Ex: The rabbits are raised on a diet of fresh vegetables and fruits.
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