Yes, women are pressured to look thin. I recommend taking a look at women in advertising. The images aren't realistic, for one thing. A lot of what you see is modified by computer art... women in advertising photos often have no pores in their skin or imperfections, and they are unrealistically thin. Cindy Crawford once said that she wished that she could look like Cindy Crawford (referring to computerized enhancements). Women are frequently dismembered with images focusing on breasts and legs (a form of dehumanizing a human being and objectifying them). Another form of objectifying women entails incorporating women's bodies into objects such as bottles of beer, kegs, and so on. For example...
http://jessicaknoop.files.wordpress.com/2010/04/1.png?w=299&h=224
http://www.youtube.com/watch?v=l-NfrBgYIEQ
If you believe that I am biased, I encourage you and challenge you to find advertising to the contrary. Try to find pictures of women where they are not sexualized and objectified, where they are represented as intelligent human beings to be valued for their intellect and equal worth and dignity as human beings. Try to find pictures of women of realistic features who are represented in a positive way (and not as, say, a "before weight loss" representation or something of the sort).
Also, there has been a slight rise in objectifying men in advertising. As men more and more are represented unrealistically, we are finding a correlation in an increase in eating disorders among men.
As a final note, the Bible records Jesus as compassionate toward women, and they were even part of Christ's inner circle. Jesus regarded all people including women as people who are God's creation and people who He dearly loves. Advertising encourages people to strive for unattainable goals. God, on the other hand, knows that left on our own, we would have no hope of being perfect and so instead He calls upon us to rest in His arms as He carries us home.
Peace be with you.