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Teen brain scans reveal a key to weight loss

February 18, 2015
Brigham Young University
MRI scans of teenagers who had successfully lost weight and kept it off show that they have higher levels of executive function -- the ability to process and prioritize competing interests. Executive function is a trait that can be improved, scientists say.

Photo of BYU's MRI lab.
Credit: Mark A. Philbrick

It sounds cruel to put an already hungry teenager in an MRI scanner and show him pictures of burgers, fries, pizzas, syrupy waffles and ice cream cones.

But thanks to 34 willing teens, researchers have found a new way to help adolescents trying to achieve a healthy weight.

"The promising piece is that it appears we can help people to learn how to make better choices about food," said Chad Jensen, a psychologist at Brigham Young University.

In the experiments, three groups of teenagers fasted for four hours before viewing images of healthy and unhealthy foods during a brain scan. One group consisted of overweight teens. A second group was comprised of formerly overweight teens who had lost weight and kept it off for at least a year. The third group of teens had historically maintained a healthy weight.

As the teens looked at the food pictures, neuroscientists looked at which areas of their brains lit up. Specifically, they measured activity in the pre-frontal cortex where a process known as "executive function" resides. Executive function is the ability to process and prioritize competing interests.

When high-calorie foods were shown, the group of formerly overweight teenagers showed the highest activity levels in this region. That means they relied on the executive function processes more than the other groups, which may explain why they succeeded in losing weight.

"You can improve executive control," said Brock Kirwan, a neuroscientist at BYU and study co-author. "Successful programs involve repeated practice and ramping up the challenges to executive control, kind of like successful exercise programs."

The study authors note that a variety of activities can improve children's executive functions: computerized training, games, aerobic physical activity, martial arts and yoga. In addition to challenges that increase over time, an emphasis on delayed rewards is also critical.

The study -- which appears in the scientific journal Obesity ­- is the first publication to come from data collected at BYU's new MRI facility. Among many other ongoing projects, Jensen and Kirwan plan to do follow-up research on executive control and weight loss. Something they'd like to answer is how a generalized training on executive function compares to a food-specific regimen.

Story Source:

Materials provided by Brigham Young University. Note: Content may be edited for style and length.

Journal Reference:

  1. Chad D. Jensen, C. Brock Kirwan. Functional brain response to food images in successful adolescent weight losers compared with normal-weight and overweight controls. Obesity, 2015; DOI: 10.1002/oby.21004

Cite This Page:

Brigham Young University. "Teen brain scans reveal a key to weight loss." ScienceDaily. ScienceDaily, 18 February 2015. <>.
Brigham Young University. (2015, February 18). Teen brain scans reveal a key to weight loss. ScienceDaily. Retrieved May 23, 2017 from
Brigham Young University. "Teen brain scans reveal a key to weight loss." ScienceDaily. (accessed May 23, 2017).