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A negative associative effect refers to a scenario in nutrition where the presence of one nutrient negatively impacts the utilization of another nutrient, leading to less efficient absorption or utilization of those nutrients. In this context, the overabundance of starch that cannot be fully utilized exemplifies a negative associative effect. When there is too much starch available in the diet, it can lead to issues such as inefficient fermentation in the rumen or gastrointestinal tract. This excess can also result in a higher production of byproducts that may inhibit the digestion or absorption of other essential nutrients, thus impairing overall nutritional effectiveness.

In contrast, excessive protein intake, insufficient mineral intake, and excessive fiber in the diet can indeed present challenges, but they do not directly illustrate the concept of a negative associative effect. Excessive protein may lead to waste and inefficiency, insufficient mineral intake is simply a deficiency issue, and too much fiber can inhibit digestion, but these don't specifically highlight the interaction effect that the presence of starch does with other nutrients.