The St. Without the why, you probably have only come up with an observation—that there are, for instance, many different metaphors in such-and-such a poem—which is not a thesis.
Avoid merely reporting a fact. This is a weak thesis statement for two major reasons. Example: Peanut butter and jelly sandwiches are the best type of sandwich because they are versatile, easy to make, and taste good. Compare the original thesis not specific and clear enough with the revised version much more specific and clear : Original thesis: Although the timber wolf is a timid and gentle animal, it is being systematically exterminated.
Some people think that the cause of rising obesity is lack of individual self-control; however, the truth is that the growing waistlines are caused by corporations that secretly add sugar to make foods more addictive; technology which has made people less active, and more tied to their work; and portions sizes in restaurants, which have ingrained overeating into our habits.
Your first step, then, is to distill the assignment into a specific question. After a brief introduction of your topic, you state your point of view on the topic directly and often in one sentence.
In your thesis statement, you don't need to state every single detriment you're going to lay out in fact, you shouldn't as it will risk becoming a run-on sentence but you can point to the main areas you will explore. Avoid overused, general terms and abstractions.
Some Caveats and Some Examples A thesis is never a question. Here are a variety of examples for different kinds of essays: Cause: Why are Americans rapidly becoming more obese?