I'm not at all interested in dieting--don't need to--don't like the dieting culture we live in. But this is about one's diet as much as dieting and makes decent sense for people with sugar-level problems. I don't actually need it, but I once thought I did. Because it isn't about cutting out foods so much as balancing them it actually means you enjoy food more, not less. Simply balance off high GI index foods with low GI index ones and you have steadier sugar levels and more variety in your meals.
To be honest, someone with a balanced and varied diet kind of already does this. For me it just got me eating a number of more interesting things and actually helped me to appreciate tastes more. Of course, even when I tried following it for medical reasons I didn't take it all that seriously. My motto is 'give thanks, eat moderately and enjoy God's variety'. If you do that all food is 'healthy' and you need worry nothing about all the things our age loves to fear (fat, artificial, non-organic, GM, pesticides, gluten...)
If a recipe doesn't look appetising enough, just add some cheese or cream or butter...