(CBS) - Heart attack survivors who eat a lot of cereal fiber live longer, according to Boston researchers. They looked at more than 4,000 men and women who suffered their first heart attack and then tracked their lifestyle habits for 9 years. Those who ate the most fiber from grains, had a 25% lower chance of dying. _______________________________________________________________________________________________________________________ (CBS) - New research finds young people with Attention Deficit Hyperactivity Disorder, or ADHD, have disrupted brain connections. The study, published in the Journal Radiology, used a new kind of MRI scan on a group of about 60 boys -- half with ADHD and half without. The MRI measured brain activity when the child was not focused on a specific task. The boys with ADHD had altered function in parts of the brain that process strategy and inhibition. _______________________________________________________________________________________________________________________ (CBS) - Two studies show people who exercise through their 50's and 60's live longer and avoid disabilities. In one study, researchers tested grip strength, balance and how fast a person could rise from a chair. Those who could not perform the tests, had a greater risk of dying sooner. In the second study, researchers tracked people at high risk for developing knee osteoarthritis. Those who exercised with light intensity reduced their risk and slowed the condition from progressing.