Given the task definition and input, reply with output. You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

This is a good quality product, which definitely helps tame my tummy. I have it each evening and it makes a huge difference in how I feel. Definitely recommended, along with Heather's Acacia Fiber, which is life-changing.
Positive