@DaisyJane
One of the "virtues" of the BMI is that it is a number that more or less takes into account the height of a person. So a single number may serve as a target to see whether one's weight is more or less normal.
The drawback – and it comes from an engineer – is that most numbers we use don't mean anything. Saying that someone is "too big" or "the right size" or "perfectly in shape" by using just the BMI reminds me of those book critics which put something like "this book – 250 pages – 25 $". The number of pages doesn't say how good the writer or their novel is, or whether the phone book would be a more captivating document to read.
One of the "virtues" of the BMI is that it is a number that more or less takes into account the height of a person. So a single number may serve as a target to see whether one's weight is more or less normal.
The drawback – and it comes from an engineer – is that most numbers we use don't mean anything. Saying that someone is "too big" or "the right size" or "perfectly in shape" by using just the BMI reminds me of those book critics which put something like "this book – 250 pages – 25 $". The number of pages doesn't say how good the writer or their novel is, or whether the phone book would be a more captivating document to read.