You Do What You Eat

At first glance, there seems nothing special about the students at this high school in Appleton, Wisconsin. They appear calm, interact comfortably with one another, and are focused on their schoolwork. No apparent problems.

And yet a couple of years ago, there was a police officer patrolling the halls at this school for developmentally challenged students. Many of the students were troublemakers, there was a lot of fighting with teachers and some of the kids carried weapons.

School counsellor Greg Bretthauer remembers when he first came to Appleton Central Alternative High School back in 1997, for a job interview: "I found the students to be rude, obnoxious and ill-mannered." He had no desire to work with them, and turned down the job.

Several years later, Bretthauer took the job after seeing that the atmosphere at the school had changed profoundly. Today he describes the students as "calm and well-behaved" in a new video documentary, Impact of Fresh, Healthy Foods on Learning and Behavior. Fights and offensive behavior are extremely rare and the police officer is no longer needed. What happened?

A glance through the halls at Appleton Central Alternative provides the answer. The vending machines have been replaced by water coolers. The lunchroom took hamburgers and french fries off the menu, making room for fresh vegetables and fruits, whole-grain bread and a salad bar.

Is that all? Yes, that's all. Principal LuAnn Coenen is still surprised when she speaks of the "astonishing" changes at the school since she decided to drastically alter the offering of food and drinks eight years ago: "I don't have the vandalism. I don't have the litter. I don't have the need for high security."

The Problems with 'Convenience Foods'

It is tempting to dismiss what happened at Appleton Central Alternative as the wild fantasies of health-food and vitamin-supplement fanatics. After all, scientists have never empirically investigated the changes at the school. Healthy nutrition -- especially the effects of vitamin and mineral supplements -- appears to divide people into opposing camps of fervent believers, who trust the anecdotes about diets changing people's lives, and equally fervent skeptics, who dismiss these stories as hogwash.

And yet it is not such a radical idea that food can affect the way our brains work -- and thus our behavior. The brain is an active machine: It only accounts for two percent of our body weight, but uses a whopping 20 percent of our energy. In order to generate that energy, we need a broad range of nutrients -- vitamins, minerals and unsaturated fatty acids -- that we get from nutritious meals. The question is: What are the consequences when we increasingly shovel junk food into our bodies?

It is irrefutably true that our eating habits have dramatically changed over the past 30-odd years. "Convenience food" has become a catch-all term that covers all sorts of frozen, microwaved and out-and-out junk foods. The ingredients of the average meal have been transported thousands of kilometres before landing on our plates; it's not hard to believe that some of the vitamins were lost in the process.

We already know obesity can result if we eat too much junk food, but there may be greater consequences of unhealthy diets than extra weight around our middles. Do examples like the high school in Wisconsin point to a direct connection between nutrition and behavior? Is it simply coincidence that the increase in aggression, crime and social incivility in Western society has paralleled a spectacular change in our diet? Could there be a link between the two?

Stephen Schoenthaler, a criminal-justice professor at California State University in Stanislaus, has been researching the relationship between food and behavior for more than 20 years.He has proven that reducing the sugar and fat intake in our daily diets leads to higher IQs and better grades in school.