Description: Overweight or obese doesn't increase the odds that seniors will experience memory trouble, a new study finds. "While past studies have found obesity in middle age increases a person's risk for dementia or Alzheimer's disease, our finding shows obesity in old age has no effect on a person's memory. These findings are consistent with previous studies showing that weight loss or low body mass index in old age may be a precursor of cognitive decline in Alzheimer's disease," study author Dr. Maureen T. Sturman, a researcher at the Rush Institute for Healthy Aging, said in a prepared statement.