Being obese can have a number of harmful effects on your body – from cholesterol problems to diabetes right through to things like strain on the joints and osteoarthritis, but what about the brain? Research from the University of California suggests the amount of brain tissue you maintain as you age can be affected by obesity. So considering we’re getting older and fatter, what does this mean for our Ageing society? Dr Norman Swan finds out.

Tonic TV | T-S075 | S03E04