I stopped listening to Ideal Weight, because the 'ideal' as stated by those height vs weight things is impossible to achieve unless you happen to have a very slight build and are very unlikely to be overweight anyway!
It's far more effective to think in terms of 'ideal shape' rather than try to attain a level, and struggle to keep it there, when you're supposed to be a bit 'fatter' anyway, especially if you're an endomporph.
Moreover, if you have any aspirations to a more muscular build, and you use weights, you are going to go 'overweight' as muscle weight twice what fat does. Therefore, you're precluding, and even sabotaging, any body-building attepmts by listening to it. Of course, if you're a chick, that might not worry you so much, but then there's the diet myth of 'weight loss' vs 'fat loss' to consider.
The usual low-fat diets, that tend to be high-carb, are useless in terms of actual fat loss. Sure, you lose weight on them (and struggle not to eat even though you're starving!), but the weight you're losing is muscle weight, NOT fat, because you're body is going into starvation mode and saving the fat for later.
So, ideal weight, my arse!
Get Charles Clark's 'New High Protein Diet' and enjoy the journey, while the fat drops off, and you get ripped.