But one thing has been constant: the tendency to call some foods better for you than others.
For one thing, there are several species of hazelnuts, including a couple native to North America.
The recent series of hurricanes has demonstrated, climate change is no longer a nebulous futuristic menace, but an existential threat.
Nutrition labels are changing for the first time since they were introduced two decades ago.
There are still strides to be made in nutrition development.