Take a cup of coffee, keep adding sugar until you reach the point that you like it the most, and then when you add more sugar, you actually like it less. Well, the food industry knows that, and they spend huge amounts of effort finding the perfect spot, not just for sugar, but for fat and salt, as well.

I think the food giants are realizing that one of the big myths of them is that they can innovate.

The fast-food industry has moved into the grocery store, so you no longer have to go to a fast-food chain to find problematic foods.

As I spoke with scientists about the way fat behaves, I couldn't resist drawing an analogy to the realm of narcotics. If sugar is the methamphetamine of processed food ingredients, with its high-speed, blunt assault on our brains, then fat is the opiate, a smooth operator whose effects are less obvious but no less powerful.

I'm thinking waiters and waitresses are going to be bracing for more customers coming in going, not just kind of where is that beef from, but, like, where is that vanilla from and what's up with that sunflower oil? Is it organic or not and how many pesticides?

They may have salt, sugar, and fat on their side, but we, ultimately, have the power to make choices. After all, we decide what to buy. We decide how much to eat.