This doesn’t mean you should eat steak for every meal. Most of your diet should still be vegetables, with some fruit, too. Real fruit, with fiber, not fruit juice.
It does mean that most people don’t need to eat refined starches, such as bread, pasta, and rice, which quickly turn into sugar in your gastrointestinal tract. Whole-grain products like whole-grain breads with lots of fiber are preferable because they smooth out that sugar spike, but you can safely skip those, too, if you want.