It can be truly difficult to tell the difference between useful diet and exercise advice that can help you achieve your goals and the potentially dangerous stuff. We identify some red flags — specifics that indicate that you may need to examine the advice you’re hearing or reading more carefully before accepting it. These include ultra-low (under 1,200 cal/day) diets, generic workout and diet plans, and more. We tear down the myth of the “necessary” post-workout protein drink. And we discuss how to address your diet plans during Thanksgiving.