In this programme, Michael Mosley finds out how learning a new language can help stave off dementia. Giles Yeo goes vegan for a month to test whether it makes him healthier. Gabriel Weston asks whether you can get drunk on boozy food. Zoe Williams looks at what you can do to improve your health if you are living with heart disease. Alain Gregoire discovers how to protect your teeth from a hidden danger. Show less