Have open lines of communication, not formal discussions: No matter how awkward the topic, work to ensure that conversations about body image are informal and comfortable in order to avoid putting pressure on the topic.
Practice what you preach: Part of teaching your daughter to love and respect her body is by treating your own body the same way. Focus on being healthy instead of thin and avoid making disparaging remarks about yourself.
Take the numbers out of the equation: While BMI, clothing size, and weight are common numbers to discuss in relation to bodies and health, don't make them the focus of the conversation or something for your child to obsess or feel shame over.