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Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Blood sugar is only part of the equation. Following this type of diet causes high acidic levels which causes illness. This diet is nothing new. My grandmother followed this kind of plan back in the late 40's because they thought ALL carbs were bad. Today we know that the brain needs glucose to function. Carbs + high fiber leaves lower net carbs. And diabetics need a balance---in fact all people need a balance of healthy whole foods and exercise and fresh air. One more thing; my grandmother died of a massive heart attack on this kind of plan. She was only in her 50's.
Output:
Negative