Learn to reason out why you like what you like.

Understand yourself better so you can make better decisions.

1. Use other items as marking points.
   To continue with the jam example, you might dislike a certain brand because it is too slippery. You can identify this by considering other slippery food items, such as Miracle Whip, which is a 13 on a slipperiness scale of 0-15. If the brand of jam is more slippery than Miracle Whip, then you know the reason you dislike it is because it is much too slippery.