GRANDPARENTS can be bad for kids' health, damning new research has found.
Many are immobile, overindulgent with treats and even smoke around the children, according to the study published in scientific journal PLOS O ne.
Researchers say grandpa and grandma are missing out on the health messages being driven home to today's parents.
Oldies who served the kids freshly baked goods after a run around the park are slowly dying out as grandparents work longer and are time and energy poor.
Dr Michael Carr-Gregg, child expert and psychologist, said that it was "unfortunate" that not all grandparents were good role models.
"A child's relationship with grandparents is invaluable - it builds a sense of identity, resilience and belonging," he said.
Debby Hague, 60, has 10 grandchildren and says she is the old-fashioned grandma.
"I spoil them with my time and attention rather than feeding them sugary treats," the Gold Coaster said.