Which of the following is NOT a modified diet type?

The option indicating "High protein" is not a modified diet type because it does not represent a specific restriction or alteration to normal dietary patterns like the other choices. Modified diets are typically designed to adjust nutrient intake either for health reasons or specific medical conditions. Low fat, high fiber, and low sodium diets all serve to limit certain nutrients that can affect health outcomes, while a high protein diet generally involves an increase in protein intake rather than a modification in response to a dietary need or restriction.

In contrast, low fat diets might be prescribed for individuals with heart disease, high fiber diets can be beneficial for digestive health or in managing diabetes, and low sodium diets are often recommended for those with hypertension. Thus, a 'high protein' diet does not fall under the same category of modification.