So I just googled Giada De Laurentiis. I haven't seen her show, but I may have to look it up- I didn't know she wrote "Everyday Italian." We cook a lot of Indian and Italian dishes.
As to those folks who don't see the value of Food in HD- I was taught "People eat with their eyes." Most folks appreciate presentation, the appearance of the food. A good looking dessert will sell better. The appearance of the food affects how we perceive it's taste. And if you are "into" cooking shows, the better looking food, free of the many artifacts of NTSC, will be perceived and appreciated. And if we thereby desire that food more, we may be more likely to buy the chef's cookbooks and watch the show more. Makes the folks producing the show and advertising on it happy.