Humans are instinctively drawn to a lot of things that are really bad for us in significant amounts, because we are designed to fit into an environment where those things are scarce. Sugar, fat, inactivity, "interesting news", outrage. These all steal our attention because that response helped our ancestors survive and pick out these rare but important treats. But in typical human fashion we've now crafted a world that gives us these things all the time, and it's making us sick and miserable as a result.

"But we're just giving the people what they want" some might say. Well, depends on the definition of "want". In a taste test, junk food would win over broccoli for me, hands down - but it's broccoli that ends up on my table more often than not, because it's what makes me happier and healthier in the long run. It wasn't until my thirties before I realized just how sluggish I got after eating junk food. But if Facebook was running our diets, their algorithm would long since have "optimized" its way to junk food for all of us.

Sometimes the worst thing you can do is give people exactly what they ask for. Being healthy in a world like the one we've created requires much, much more restraint and self-discipline than it used to. "The algorithm" is basically the digital incarnation of the little devil on our shoulder whispering that we should treat ourselves.