Figures: Jon Robison takes a look at the recommended weight figures and finds them wanting:

In reality, the answer to the question, 'How much should you weigh?' is that it's largely an illegitimate question. The notion that you should weigh a specific amount as determined by any standardized chart or table is an oversimplification since it ignores too many variables and distracts from the larger question which is, 'How do I become healthy and maintain health?