This is indeed the often-heard line of thinking in the bodybuilding world. However, in the medical world is another way of looking at the topic becoming more and more prevalent. One example can be found here:
Although the video focuses on people with type 2 diabetes, the same applies to anybody who has overweight.
Roughly speaking she says that you need high insulin sensitivity in order to get a low insulin level, which in turn leads to low glucose level in the blood. Having a high insulin sensitivity makes that your body efficiently absorbs any nutrition when you do eat a meal.