This challenges the nutritionist’s assumption that home juicers could only have health benefits if the juice they produce is unusually healthy. Rather, the juicers are beneficial because they process nutrients into a form that’s easier for people to consume.

This strengthens the nutritionist’s argument. It implies homemade juices are actually less healthy than whole fruits and vegetables, supporting her claim that the juicers make food no healthier.

This does not imply the juicer is a worthwhile purchase. If it brings no benefit to the consumer, it will be a waste of money no matter how minor the cost.

This doesn’t imply the nutritionist is being insincere and it doesn’t affect her argument. She advises against buying the juicers by arguing they bring no health benefit—her purpose for making the argument is irrelevant.

This puts fruits, vegetables, and their juices in the same category. It compares them to vitamin pills, making no distinction between the health benefits of fruits and vegetables and the health benefits of their juices.