The USDA has a report on why they don't restrict certain food. The Tl;dr is that there's a lot of grey area and it would likely make no effective difference in purchasing or health habits.  I am currently awarded the maximum benefits even though I don't need it. They literally will not give you less even if you request it. So I just have guests over for dinner a lot and buy excessive amounts of (sugar free - I legitly think they tastes better) energy drinks.