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If some of the more common diets were related to yarns:

Weight Watchers Points: Each yarn has a point value and you are only allowed to buy so many points worth each month. You earn extra activity points by destashing.

Mediterranean Diet: Only buy yarns from Greece and Italy.

The Zone Diet: Only yarns that are 40% plant fibers, 30% animal fiber, and 30% acrylic.

The Atkins Diet: No acrylic yarns.

Vegan Diet: Only plant based yarns.

Raw Food Diet: Only unprocessed, un-dyed yarns.