Researchers have found further evidence that unhealthy teenagers are more likely to develop dementia later in life.
Last month, scientists in Sweden discovered there was a 2.5 increased likelihood those with poor cardiovascular levels would be diagnosed with the disease.
However, a new study, also from a group of researchers in Sweden, now claims that unfit teenagers are 2.7 times more likely to develop early-onset dementia (EOD).
Published in the journal Brain, the report also states these types of people are 3.6 times more likely than healthier individuals to have mild cognitive impairment (MCI) when they get older.
When combined with low IQ, the odds of developing EOD rose by a startling 7.7 times and MCI by 8.7 times.
Jenny Nyberg, lead author of the study, said: "There are lessons here for public policy, foremost when dealing with physical activities in school.
"Good PE is important for more than two hours per week."
Find out about dementia care and support services at Barchester care homes.